MySQL Connector/J 5.1 Release Notes

Abstract

This document contains release notes for the changes in each release of MySQL Connector/J 5.1. It also contains release notes for earlier series of Connector/J.

For additional Connector/J documentation, see MySQL Connector/J 5.1 Developer Guide.

Updates to these notes occur as new product features are added, so that everybody can follow the development process. If a recent version is listed here that you cannot find on the download page (http://dev.mysql.com/downloads/), the version has not yet been released.

The documentation included in source and binary distributions may not be fully up to date with respect to release note entries because integration of the documentation occurs at release build time. For the most up-to-date release notes, please refer to the online documentation instead.

For legal information, see the Legal Notices.

For help with using MySQL, please visit either the MySQL Forums or MySQL Mailing Lists, where you can discuss your issues with other MySQL users.

For additional documentation on MySQL products, including translations of the documentation into other languages, and downloadable versions in variety of formats, including HTML and PDF formats, see the MySQL Documentation Library.

Document generated on: 2016-08-17 (revision: 9605)

Preface and Legal Notices

This document contains release notes for the changes in each release of MySQL Connector/J.

Legal Notices

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Changes in MySQL Connector/J 5.1

Changes in MySQL Connector/J 5.1.40 (Not yet released)

Version 5.1.40 has no changelog entries, or they have not yet been published because the product version has not yet been released.

Changes in MySQL Connector/J 5.1.39 (2016-05-09)

Version 5.1.39 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, 5.6, and 5.7. It supports the Java Database Connectivity (JDBC) 4.2 API.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

For MySQL server 5.7.5 and later, the EOF packet in the MySQL server/client protocol has been deprecated and replaced by the OK packet. The change is now supported by Connector/J. (Bug #23212347)

Bugs Fixed

Connector/J hung, returned a NullPointerException, or returned an incorrect exception when using result sets with the properties TYPE_FORWARD_ONLY and CONCUR_UPDATABLE. It was due to an inaccurate check for the cursor for the result set. This fix makes sure Connector/J checks accurately on whether a cursor has been requested, both when executing a statement and fetching its results. (Bug #23201930)

When using server-side prepared statements with profileSQL=true and useInformationSchema=true, an SQLException (“ ResultSet is from UPDATE. No Data”) occurred when the client tried to advance to the next row in the result set. This was due to a failure of an internal query for metadata, which is now prevented by this fix. (Bug #23188498)

LoadBalanceConnectionGroupManager.removeHost() was not removing hosts as expected. This fix tries to ensure that host removals will be successful under different situations. (Bug #22848249)

References: See also: Bug #22678872.

For connections with useCursorFetch=true and fetch size set with defaultFetchSize or setFetchSize, if data from a TIME and a BLOB data column was selected together, corrupted value for the TIME data was returned. (Bug #22833410, Bug #80522)

For a load-balanced connection, an ArrayIndexOutOfBoundsException was thrown when ConnectionGroupManager.removeHost() was called. It was due to an error in LoadBalancedConnectionProxy.removeHost(), which has now been fixed. (Bug #22730682)

A Fabric connection threw a NullPointerException when all hosts have been removed from its host list, or when the internal load-balanced connection became null due to inconsistency of the replication connection. This fix adds to Connector/J the abilities to handle those situations. Also, a new connection property, loadBalanceHostRemovalGracePeriod, has been introduced, which sets the grace period for waiting to remove the currently active host from a load-balanced connection. See the entry for the new property in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details. (Bug #22678872)

References: See also: Bug #22848249.

FabricMySQLDataSource.getConnection() threw a null pointer exception when a master failover took place. (Bug #22598938)

The OSGi manifest file in the Connector/J JAR file did not expose the MySQL Fabric packages, so the Fabric-related classes could not be resolved even though they were present in the JAR file. (Bug #22385172)

With some Tomcat web applications, when Connector/J connects to the server with useLegacyDatetimeCode=false without setting serverTimeZone, a NullPointerException was returned. This was because the timezone property file for Connector/J was loaded by the bootstrap class loader, which did not know the location of the property file and thus failed to load it. This fix avoids the problem by making Connector/J use the same class loader for both the property file and the Connector/J classes. (Bug #22353759, Bug #79343)

When using JDBC 4.2 and with the connection property cachePrepStmts set to “true,” after a prepared statement had been cached, rerunning the SQL statement resulted in a pre-JDBC 4.2 PreparedStatement object being instantiated. This fix prevents the problem by having the PreparedStatement instantiated by a factory instead of a constructor method. (Bug #22352812, Bug #79598)

At every connection, Connector/J got the sql_mode variable from the server and tried to parse it as a number; because sql_mode is not a number (except for very old versions of MySQL), an NumberFormatException was always thrown and then caught by the code. This fix refactored the code to avoid the unnecessary throwing and catching of the error. (Bug #21181466, Bug #77171)

When inserting multiple timestamp values into a table with useLegacyDatetimeCode=false and useCursorFetch=true, after a null value had been inserted, further inserts could not change a timestamp's value. This fix makes sure the binding of the value is reset before a new insert takes place. (Bug #20685487, Bug #75956)

The exception message in CallableStatement() for incorrect output parameter registration gave little detail and the wrong error code. (Bug #18068303, Bug #71131)

Calling getTimestamp() on a timestamp column resulted in a java.sql.SQLException (“Cannot convert value ... to TIMESTAMP”). That was due to the missing metadata for each row in the ResultSet. This fix ensures that the metadata is no longer missing. (Bug #16738378, Bug #56479)

On very fast servers with other third-party components accessing the data, a ConcurrentModificationException was sometimes thrown. This fix prevents the exception by adding a synchronization to ConnectionImpl.closeAllOpenStatements(), and by refactoring part of the code inside the method. (Bug #16736619, Bug #59462)

Changes in MySQL Connector/J 5.1.38 (2015-12-07)

Version 5.1.38 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, 5.6, and 5.7. It supports the Java Database Connectivity (JDBC) 4.2 API.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

When connecting to a MySQL server 5.7 instance that supports TLS, Connector/J now prefers a TLS over a plain TCP connection. (Bug #21947042)

Two new connection properties, allowSlaveDownConnections and readFromMasterWhenNoSlaves, have been introduced for configuring replication-aware connections. See Configuring Master/Slave Replication with Connector/J and the entries for the new properties in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details. (Bug #21286268)

Bugs Fixed

In a Fabric environment, a ClassCastException resulted when a stored procedure was called with an INOUT parameter. This was because in this situation, what was being cast was a proxied version of the object. This fix extracts the underlying object from its proxy, allowing it to be cast to the implementing class. (Bug #22096981)

getTypeInfo() erroneously returned a PRECISION value of “255” instead of “65535” for the data type VARBINARY. (Bug #21978216)

A deadlock was observed when in the same server group, two concurrent threads were using different Fabric connections, and one executed a failover procedure while the other simultaneously called a method that acquired a lock on the underlying replication connection instance monitor. This fix revised the locking mechanism of replication connections, in order to prevent the observed deadlocks. (Bug #21966391, Bug #21934573, Bug #78710)

State information of a Fabric group was not updated by Connector/J after a local cache's Time to Live (TTL) expired, which resulted in the client not recognizing any topology changes happening to the group like a master failover, a server rejoining, and so on. (Bug #21296840, Bug #17910835)

Connector/J threw an AbstractMethodError when a JDBC 4 functionality (for example, createBlob()) was used on a replication-aware connection. This has been fixed by putting replication connections under the multi-host connection proxy structure that Connector/J has been using for load-balanced and fail-over connections. (Bug #11763419)

References: See also: Bug #11763401.

After the initial call of Connection.setReadOnly() following the creation of a replication-aware connection, subsequent calls of Connection.setReadOnly() could not change the nature of the connection. This has been fixed by putting replication connections under the multi-host connection proxy structure that Connector/J has been using for load-balanced and fail-over connections. (Bug #11763401)

References: See also: Bug #11763419.

Changes in MySQL Connector/J 5.1.37 (2015-10-15)

Version 5.1.37 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, 5.6, and 5.7. It is also the first release of MySQL Connector/J to support the Java Database Connectivity (JDBC) 4.2 API.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

methodCompressedInputStream.getNextPacketFromServer() has been refactored to reduce memory use and garbage collection efforts caused by the use of the inflater. (Bug #21648826, Bug #78106)

The code for executing a REPLACE statement when rewriteBatchedStatements=true has been refactored by putting multiple batched statements into a single query, making it work more like an INSERT statement. This increases the efficiency for running REPLACE statements. Thanks to Jie Han for contributing the code. (Bug #21429909, Bug #77681)

A new connection property, sendFractionalSeconds=true|false, has been introduced. It controls whether fractional seconds in timestamps are to be truncated on the client side or to be sent to the server side for truncation there. See the entry for the new property in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details. Thanks to Kwon Nam Son for contributing the code. (Bug #21304726, Bug #77449)

A new connection property, enableEscapeProcessing, has been introduced for supporting JDBC 4.2. It sets the default escape processing behavior for Statement objects. See the entry for the new property in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details.

Connector/J now supports the JSON data type, which has been supported by the MySQL server since release 5.7.8.

Bugs Fixed

A ClassCastException resulted for a Fabric connection when rewriteBatchedStatements was “true” and a batch update was rewritten. (Bug #21876798)

A number of regression tests in the testsuite failed when they were run against MySQL 5.7, because the NO_AUTO_CREATE_USER SQL mode had become the default behavior of the server since MySQL 5.7.7, making some GRANT statements in the test fail when a new user had to be created. With this fix, CREATE USER statements have been added to the regressions tests when needed, to prevent the test failures. (Bug #21697684, Bug #78225)

Connecting to MySQL 5.0 and 5.1 using Connector/J 5.1.36 resulted in an SQLException, with a complaint for an “Unknown system variable 'language'”. (Bug #21415165, Bug #77665)

The IS_GENERATEDCOLUMN field was empty in the result returned by DatabaseMetaData.getColumns(). This fix corrects the field so that it contains a YES or NO according to whether the column is generated or not. (Bug #20969312, Bug #76859)

getTypeInfo() returned an incorrect PRECISION value of “255” for the data type of VARCHAR. The return value has been corrected to “65535.” (Bug #20675539, Bug #76187)

When a connection is forcefully closed with abortInternal() in the ConnectionImpl class, a null point exception sometimes resulted. This is now avoided by putting the associated this.io.releaseResources() call inside a try block, so that the exception, unavoidable due to a race condition, can be properly caught and ignored. (Bug #20536592, Bug #75849)

If the MySQL server's default authentication method was SHA256 but neither one of the Connector/J connection properties allowPublicKeyRetrieval and serverRSAPublicKeyFile was set, the authentication failed with a TransientConnectionException, complaining that the public key could not be retrieved. With this fix, authentication continues in the situation, allowing other enabled authentication methods to be tried. (Bug #20433047, Bug #75670)

When a lock wait timeout occurred, an SQLException was thrown while an SQLTransientException should be thrown instead. It was due to a wrong SQLState number used in the code, which has now been fixed. (Bug #16634180)

When the time zone on the MySQL server was configured to “GMT” but the client was in a different time zone, Connector/J would make wrong adjustments for event timestamps when working with the server. (Bug #11758179, Bug #50348)

Changes in MySQL Connector/J 5.1.36 (2015-07-02)

Version 5.1.36 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

The files in the Maven Central Repository for each Connector/J release have been reorganized and a source artifact (*-sources.jar) has been added, for release 5.1.21 and after. (Bug #20283655, Bug #75335)

Bugs Fixed

Results returned by DatabaseMetaData.getCatalogs() were not properly sorted by catalog name. (Bug #21215151)

A class cast exception occurred when Connector/J was executing a streaming prepared statement in a Fabric environment. (Bug #21184949, Bug #77217)

Connector/J did not use the character set specified with the connection property passwordCharacterEncoding for authentication. With this fix, the property is now honored. If it is not set, Connector/J uses the value of characterEncoding instead; if even that is not set, Conenctor/J defaults to UTF-8 for the password's encoding. (Bug #20825727)

A failover did not occur for a MySQL Fabric connection during the failure of a master server. It was because the state change of the Fabric connection group was not handled properly, which hs been corrected by this fix. (Bug #20821888, Bug #75113)

When the getDate() and getTime() methods of ResultSet were called to retrieve values with fractional seconds, a “bad format” error occurred. With this fix, the fractional seconds are dropped before the retrieved values are converted into a Date or Time object. (Bug #20804635)

A StringIndexOutOfBoundsException occurred when getProcedureColumns() were trying to return ENUM or SET type procedures or functions that involved reserved words. That was caused by a problem in the parser for the functions' or procedures' CREATE statements, which this fix corrects. (Bug #20727196)

At every connection, Connector/J executed a SHOW VARIABLES WHERE statement over a multitude of variables, which consumed a lot of time and memory. To improve the efficiency of the code, this fix replaces the statement with the more efficient SELECT @@variable query and also implements some other related changes. (Bug #20408891, Bug #75592)

getProcedures(), getFunctions(), getProcedureColumns(), and getFunctionColumns() returned duplicate results when the connection parameter nullCatalogMeansCurrent was set to “false.” (Bug #19803348)

An UnsupportedEncodingException during handshake gave rise to a NullPointerException. With this fix, the NullPointerException is no longer thrown, and a proper error message is provided by Connector/J. (Bug #18758686, Bug #72630)

When using Connector/J with MySQL Fabric, the createGroup() method failed with a ClassCastException. (Bug #18719760, Bug #72546)

Using Connector/J to connect with non-null user name and password to a MySQL Fabric server that had authentication disabled resulted in a NullPointerException. (Bug #18425861, Bug #72077)

The change user functionality in Connector/J was dependent on Bug# 70865 of the MySQL server (for releases 5.5 and later, the server unnecessarily sends a plugin_request_packet for every COM_CHANGE_USER packet). That dependence made the com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource interface fail for server versions or forks that did not have the same bug. This fix removes that dependence and makes the interface function properly, whether the server suffers Bug# 70865 or not. (Bug #17810800, Bug #70927)

JDBC4MySQLPooledConnection keeps a list of statementEventListener instances named statementEventListeners, which is used as monitor lock whenever the fireStatementEvent() method is called. However, because the pooled connection's close() method set statementEventListener to be null, if a prepared statement was closed after its holding pooled connection had already been closed, the subsequent fireStatementEvent() call would run into a NullPointerException. This fix prevents the problem by having JDBC4MySQLPooledConnection initializing statementEventListeners properly and never setting it to null, thus allowing it to be used all the time as a monitor lock. (Bug #16444069, Bug #62452)

Changes in MySQL Connector/J 5.1.35 (2015-03-23)

Version 5.1.35 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

The failover support by Connector/J has been refactored to be implemented independently of Connector/J's load-balancing feature. This resolves a number of issues including, for example, (1) a failover being triggered inadvertently, (2) a failover process kept trying to connect to an unavailable server (while there was an available one), and (3) the number of active connections kept growing until Connector/J threw an exception when there were successive failovers within the same connection. (The issues are regressions of Bug #75168.) (Bug #20533907, Bug #75885)

A number of new configuration properties have been introduced:

enabledSSLCipherSuites: For setting the enabled cipher suites used by JSSE. This configuration property needs to be set when using Java 7 or lower or MySQL Server Community edition version 5.7.6 or higher.

readOnlyPropagatesToServer: For controlling the implicit propagation of the read-only transaction access mode to the server, which affects optimization for InnoDB read-only transactions.

noTimezoneConversionForDateType and cacheDefaultTimezone: For improving Connector/J's time zone support; see the changelog entry for Bug #18028319/Bug #71084 below for details.

See the descriptions for these properties in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for more details.

Connector/J now exposes the PreparedStatment.ParseInfo class for external usage, with no capture of the connection, which allows global, highly-concurrent parse caches to be implemented.

Bugs Fixed

Issues with a number of the regression tests in the Connector/J test suite caused them to fail when they were run against MySQL 5.7.6. Those tests have now been fixed. (Bug #20606107)

Calling the function Clob.setString() with valid input resulted in a string index out of bounds exception. (Bug #20453712)

Calling the function Clob.position() resulted in an exception, because the function passed the wrong index value to the getSubString() function. (Bug #20453712)

When in streaming mode, if Connector/J encountered an exception while reading from the stream, a subsequent call to the close() method of the result set would put the thread into a blocking state, from which it would not exit. With this fix, the result set can now be properly closed when, due to an error, there is no more data to be loaded from the stream. (Bug #20272931, Bug #75309)

The setTimestamp method failed in a Fabric connection with a null pointer exception. It was because the implementation for the getCalendarInstanceForSessionOrNew method was missing, which has been added by this fix to Connector/J. (Bug #20217686, Bug #75080)

When using JDBC 4 features of Connector/J 5.1 with JDK 6 and above, custom implementations of the interface LoadBalanceExceptionChecker failed to work. This was because most of the JDBC 4-specific classes of Connector/J do not implement a JDBC interface directly, but extend other JDBC 3 classes instead, so that the LoadBalancingConnectionProxy.isInterfaceJdbc() check did not work. This fix makes the checking work by extending its search to include also the super classes. (Bug #20204783, Bug #75168)

The readRemainingMultiPackets method in the MysqlIO class returned incorrect results when a row was larger than 16MB in size. This fix corrects the wrong type conversion occurred during the calculation, which caused the problem. (Bug #20112694, Bug #74998)

Calling getString() after rs.relative() had been called with an argument smaller than “-1” resulted in a null pointer exception, because rs.relative() could not handle the argument properly. (Bug #19536760)

All occurrences of the StringBuffer class in the Connector/J code has been replaced with the StringBuilder class, in order to improve code performance. (Bug #19465516, Bug #73595)

Quoted identifiers in some SQL statements were not properly escaped. (Bug #18925727)

A java.sql.date value was stored incorrectly on the server and also returned incorrectly if the client and the server were in different time zones when useLegacyDatetimeCode=false or useTimezone=true. This was due to the time-zone conversion performed by Connector/J on the SQL DATE type. To avoid the issue, a new property noTimezoneConversionForDateType has been created for Connector/J, which is set to “true” by default, preventing Connector/J to perform the kind of time-zone conversion that caused this bug.

In addition, another new property cacheDefaultTimezone has been created: when it is set to “true” (by default), Connector/J caches the time zone first obtained from the client and uses it throughout the time the application is running. When it is set to “false,” Connector/J becomes aware of time zone changes in the client at runtime that are initiated by calling java.util.TimeZone.setDefault(zone). (Bug #18028319, Bug #71084)

A deadlock occurred when concurrent prepared statements making use of timestamp objects were executed in a single connection. To avoid this, the locking mechanism involved has been changed, so that the calendar object for the session is only locked when it is actually being used. (Bug #15936413, Bug #67760)

There was an unnecessary call of targetCalendar.setTime() in the newSetTimestampInternal() method of the PreparedStatement.java class, which modified the user-supplied Calendar object and might cause side effects for the client application. The unnecessary call has now been eliminated by the fix put in for Bug #18028319/Bug #71084. (Bug #11761585, Bug #54095)

Changes in MySQL Connector/J 5.1.34 (2014-11-04)

Version 5.1.34 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J now supports connections to MySQL servers through a SOCKS proxy. Two new configuration properties, socksProxyHost and socksProxyPort, have been introduced to support this new feature; see the entries for them in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details. Note that authentication is not directly supported in the current implementation for SOCKS proxy support. (Bug #13940005, Bug #64862)

The process for building Connector/J from source has been revamped to fix incompatibilities with Eclipse 4.4, remove dependency on Ant Contrib, improve on the documentation for the code, and to improve on the structure of the output. See Installing from Source for the updated instructions for building Connector/J 5.1.34.

Bugs Fixed

When connecting to MySQL server 5.7.4 or earlier, the connection failed when the password was blank for any users created on the server using the mysql_old_password plugin. This fix refactored the testOldPasswordPlugin of Connector/J so that it works well with the server under the situation. (Bug #19383371)

An exception was thrown when users tried to run the testsuite.fabric test cases without specifying the property com.mysql.fabric.testsuite.port. With this fix, the Fabric test cases will not be run unless the test environment has been configured. (Bug #18474141)

Changes in MySQL Connector/J 5.1.33 (2014-09-25)

Version 5.1.33 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, and 5.6.

Bugs Fixed

Many parameters specified with options when making an Ant build of Connector/J from source (for example, com.mysql.jdbc.testsuite.url.sha256default) were not set as system properties and thus were not available for use in the JUnit tests in the testsuite. With this fix, all com.mysql.jdbc.test.* and com.mysql.jdbc.testsuite.* parameters are forwarded to the JUnit tests. (Bug #19505524)

The 4-byte UTF8 (utfbmb4) character encoding could not be used with Connector/J when the server collation was set to anything other than the default value (utf8mb4_general_ci). This fix makes Connector/J detect and set the proper character mapping for any utfmb4 collation. (Bug #19479242, Bug #73663)

XA connections failed with a class cast exception for a load-balanced configuration with pinGlobalTxToPhysicalConnection=true. This was because some XA-related classes used com.mysql.jdbc.ConnectionImpl in method parameters during calls. This fix makes the classes use com.mysql.jdbc.Connection instead in those cases. (Bug #19450418, Bug #73594)

The MANIFEST.MF file for the JAR package of Connector/J included an empty line between the attributes Import-Package and Name, which was interpreted as a mark for the end of the main section of the manifest file. This fix removes the empty line. (Bug #19365473, Bug #73474)

changeUser() calls might result in a connection exception (“Got packets out of order”) or a freeze if the useCompression option was set to true. (Bug #19354014, Bug #19443777, Bug #73577)

The tests testByteStreamInsert and testUseCompress in the Connector/J testsuite failed with the message “Row size too large (> 8126)...” when they were run against the MySQL server version 5.6.20. This is due to a known limitation with the server version, for which innodb_log_file_size has to be set to a value greater than 10 times the largest BLOB data size found in the rows of the tables plus the length of other variable length fields (that is, VARCHAR, VARBINARY, and TEXT type fields) (see the MySQL 5.6.20 changelog for details). This fix adds, for MySQL 5.6.20, a check for innodb_log_file_size to assert that its value is 335544320 or larger and throws an exception if it is not so, asking the user to increase the size of innodb_log_file_size. (Bug #19172037)

Using Java 6 or later, running LOAD DATA INFILE with a prepared statement resulted in an IndexOutOfBoundsException. This was a regression introduced by an issue in the patch for Bug #72008, which has now been fixed. (Bug #19171665, Bug #73163)

References: This issue is a regression of: Bug #72008.

Connector/J failed the test for Bug# 64205 in the testsuite, thus might return a garbled error message for an invalid query when connected to MySQL server 5.5 or later. The failure was a regression introduced by the fix for Bug #18836319, which made the issuing of SET NAMES dependent on the character set difference between the server and the connection. This fix corrects the way by which the error messages are interpreted, so that they will come out right at any stage of a connection. (Bug #19145408)

References: This issue is a regression of: Bug #18836319.

Errors occur when Connector/J mapped Windows time zones to Olson time zones for “Caucasus Standard Time” and “Georgian Standard Time”. This fix corrected and updated all the time-zone mappings in Connector/J using the data from the IANA Time Database v.2014g and the Unicode Common Locale Data Repository (CLDR) v.25. (Bug #17527948, Bug #70436)

The test case testsuite.simple.XATest.testRecover failed when run against MySQL servers 5.7.0 to 5.7.4, because Connector/J did not understand the new output format for XA RECVOER that was introduced since MySQL 5.7.0 for fixing Bug #19505524. That fix has recently been reverted in MySQL 5.7.5, so that XA RECOVER output is now, by default, in the old format again. The test case, which runs well with MySQL 5.7.5, is now skipped for server versions 5.7.0-5.7.4. (Bug #17441747)

References: This issue is a regression of: Bug #19505524.

Changes in MySQL Connector/J 5.1.32 (2014-08-11)

Version 5.1.32 is a maintenance release of the production 5.1 branch. It is suitable for use with MySQL server versions 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J used to always check every SQL statement in a server-side prepared statement to see whether it contained the ON DUPLICATE KEY UPDATE clause; but because the clause is only used with INSERT statements, the checks are unnecessary for other SQL statements while they reduce the performance of Connector/J. A new, boolean connection property avoidCheckOnDuplicateKeyUpdateInSQL has been added, by which the checks for the ON DUPLICATE KEY UPDATE clause can be disabled. (Bug #18232840, Bug #71672)

Connector/J now supports Fabric 1.5. Older versions of Fabric are no longer supported.

Bugs Fixed

Preparing a call to a stored procedure with Fabric caused a null pointer exception to be thrown. (Bug #19034681, Bug #73070)

A bug in the Linux kernel version 3.6 and earlier caused the MysqlIO.clearInputStream() method to enter an endless loop. This fix changes the way the looping condition is evaluated, in order to avoid the problem. (Bug #19022745, Bug #73053)

Connector/J returned the incorrect return code “0” for a thrown exception when the failure happened in the context of a global XA transaction. With this fix, Connector/J now wraps any unexpected exception in an XAException in that case and returns the error code XAER_RMFAIL. (Bug #18970520, Bug #72890)

Calling the changeUser method to switch to a user created using the sha256_password plugin would result in a null pointer exception. This was due to the fact that the fromServer buffer was unavailable when changeUser called the sha256_password plugin, and this fix makes the plugin accommodate to that. (Bug #18869381)

The test testSha256PasswordPlugin failed when executed against a commercial version of the MySQL server. (Bug #18852682)

Connecting to a user on the server created using the sha256_password plugin failed when the password specified by the client was an empty string (or when no password was specified). This fix makes Connector/J allow an empty password in that case, sending it to the server without applying RSA encryption on it. (Bug #18852587)

Trying to use any character sets other than UTF-8 for communications between client programs and the MySQL server caused Connector/J to perform extra queries after the initial connection, resulting in higher latency and overhead for the connection. To prevent extra queries, this fix eliminates the mechanism of setting the character set to values other than “utf-8” by issuing a SET NAMES statement to the server, and allows the use of the connection property characterEncoding to set the character set value in Connector/J's response packet during handshake. (Bug #18836319, Bug #72712)

Connector/J failed the test ConnectionRegressionTest.testBug7607() when Java 8 was used, due to the new static character set mappings in Java 8. The bug no longer exits after a refactoring of the character set code for Connector/J 5.1.32. (Bug #18809129)

A null pointer exception was thrown in isInterfaceJdbc() sometimes when load balancing was used and the application involved runtime instrumentations. (Bug #18691866, Bug #72502)

The keys generated by INSERT statements using the ON DUPLICATE KEY UPDATE clause were incorrect when the clause “ON DUPLICATE KEY UPDATE” was not written exactly as so (for example, when spaces or comments were inserted in between the words). (Bug #18344403, Bug #71923)

XA connections failed with a ClassCastException for a load-balanced configuration with multiple hosts. This was because some XA-related classes used com.mysql.jdbc.ConnectionImpl in method parameters during calls. This fix makes the classes use com.mysql.jdbc.Connection instead in those cases. (Bug #16722757, Bug #62577)

The Ant script for building Connector/J from source failed to check the availability of javac and rt.jar from JDK 1.6 before compilation. That caused compilation to fail when the two files weren't available. This fix corrects the step in the build script that checks for those files before compilation. (Bug #11748301, Bug #35829)

Changes in MySQL Connector/J 5.1.31 (2014-06-07)

Version 5.1.31 is a maintenance release of the production 5.1 branch. It is suitable for use with many MySQL server versions, including 4.1, 5.0, 5.1, 5.4, 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added support for sha256_password authentication with RSA encryption.

Bugs Fixed

The option name gatherPerfMetrics in the fullDebug.properties file was misspelled as gatherPerMetrics. That resulted in the performance metrics not being logged. The name has been corrected in both the file and the Connector/J manual. (Bug #18598665, Bug #72326)

The MySQL Fabric driver did not properly propagate exceptions thrown during connection creation using JDBC 4. (Bug #18549472, Bug #72301)

In the method MysqlIO.unpackBinaryResultSetRow, an array was created unnecessarily to hold the null bit mask. With this fix, Connector/J avoids the creation of the array by making use of the data that is still variable in the original buffer object. (Bug #18403456, Bug #72023)

In the method PreparedStatement.ParseInfo, a character array was created unnecessarily out of a string object. This fix removed the unnecessary instantiation of the array. (Bug #18403199, Bug #72006)

When trying to get an integer from a column value that was not a number, instead of a NumberFormatException , an ArrayIndexOutOfBoundsException was thrown instead due to an off-by-one error. This fix corrects the stop condition for trimming spaces in the beginning of byte buffers in the getShort(), getInt(), and getLong() methods in the StringUtils class. (Bug #18402873, Bug #72000)

The StringUtils.getBytes methods have been refactored to avoid unnecessary creations of string objects for encoding character arrays into bytes. Also, unneeded StringBuffers are replaced by StringBuiders. (Bug #18389973, Bug #72008)

When exception interceptors were used, the init() method was called twice for each exception interceptor, once by Util.loadExtensions() and again by ConnectionImpl.ExceptionInterceptorChain.init(). This fix eliminates the calls by ExceptionInterceptorChain.init(). (Bug #18318197, Bug #71850)

After a non-SSL socket had been transformed into an SSL socket, Connection was still keeping its reference to the wrapped, non-SSL socket, failing to recognize that the type of connection had been changed. This fix creates a new StandardSSLSocketFactory class, which implements SocketFactory and wraps the initial SocketFactory.afterHandshake() method. MysqlIO.socketFactory was replaced after the socket transformation, so that afterHandshake() is performed on the old factory but returns the new socket. (Bug #18260918, Bug #71753)

When rewriteBatchedStatements=true and useAffectedRows=true were set, executeBatch() returned the number of affected rows as given by the server, which was not a reliable value unless it was a “0”. That behavior was due to the fix for Bug#68562, which was implemented in Connector/J 5.1.27 (see the changelog for the release), and has been breaking a number of applications that use Connector/J. In this new fix, Connector/J returns Statement.SUCCESS_NO_INFO as a result for each statement in the batch as long as there are more than one batched statement and the returned value for the affected rows from the server is greater than “0”. Connector/J returns a “0” otherwise, which indicates that no rows have been affected. (Bug #18009254, Bug #61213)

If profileSQL was enabled, a memory leak would occur after a connection was lost and continuous attempts were made to reconnect. It was because ProfilerEventHandlerFactory kept a map in which dead connections kept on accumulating. This fix refactors the ProfilerEventHandlerFactory and eliminates that map. (Bug #16737192, Bug #55680)

When useCursorFetch was set to true, Connector/J would attempt to send XA commands as server prepared statements, which were unsupported, and the commands would have to be resent as plain statements. This fix stops Connector/J from sending XA commands as server prepared statements. (Bug #16708231, Bug #67803)

When closing a server-prepared statement twice and cachePrepStmts=true, the second call closed the statement as expected. However, if a call of Connection.prepareStatement() was made again with exactly same SQL string, Connector/J obtained the closed statement from the cache and failed by throwing an exception. With this fix, ServerPreparedStatement.close() detects and ignores subsequent close() calls on cached statements that have already been closed. (Bug #16004987, Bug #66947)

Changes in MySQL Connector/J 5.1.30 (2014-03-31)

Version 5.1.30 is a maintenance release of the production 5.1 branch. It is suitable for use with many MySQL server versions, including 4.1, 5.0, 5.1, 5.4, 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J now supports MySQL Fabric. See Using Connector/J with MySQL Fabric for details.

Bugs Fixed

Replaced a for loop with the System.arraycopy() method for copying array values in the MysqlIO.unpackNativeEncodedColumn() and LoadBalancingConnectionProxy.addHost() methods, in order to improve the two methods' performance. (Bug #18327245, Bug #71861)

Avoided the use of an iterator over the list of statement interceptors in the methods MysqlIO.invokeStatementInterceptorsPost() and MysqlIO.invokeStatementInterceptorsPre(), so that Connector/J does not increase the stack size unnecessarily. (Bug #18236388, Bug #71679)

The Field.getStringFromBytes() method created a useless byte array when using JVM's converter and the encoding defined by the connection. This fix makes the method call StringUtils.toString() using the original buffer instead of creating a temporary byte array for the call. (Bug #18228668, Bug #71623)

Improved on the code for integer-to-hex conversion when building XA commands by avoiding the creation of temporary character arrays, thus enhancing performance. (Bug #18228302, Bug #71621)

It was intended that if a previous query on a connection had used the setMaxRows() method, in the next query, Connector/J would not cancel that by setting SQL_SELECT_LIMIT=DEFAULT if the query contained a LIMIT clause. However, in the actual implementation, the maximum row setting was reused in the subsequent query in various situations beyond expectation (for example, when a table name contains the string “limit” in it). This fix removes the LIMIT-clause parsing and replaces it by a better way of controlling the maximum rows per session. (Bug #18110320, Bug #71396)

There were sporadic cases of the key store file being open hundreds of times and causing some "Too many files open" errors. This fix makes sure that in com.mysql.jdbc.ExportControlled and in MysqlIO.sendFileToServer(), the input stream for the key store file is explicitly closed after use. (Bug #18107621, Bug #71432)

When working with MySQL 5.6, calling PreparedStatement.setTimestamp() resulted in a java.lang.StringIndexOutOfBoundsException being thrown if the Timestamp contained a fractional second. This fix corrects the digit truncation performed in the formatNanos() method, which was the cause of the problem. (Bug #18091639)

Calling ResultSet.close() on an already closed ResultSet caused an SQLException. While the exception was silently discarded, it did result in performance issues. This fix makes Connector/J comply with the Java specification that when a ResultSet object is already closed, application of the close method on it should be a no-op. (Bug #16722637, Bug #67318)

Fixed the problem of the wrong source being provided when the build property com.mysql.jdbc.noCryptoBuild was set.

Changes in MySQL Connector/J 5.1.29 (2014-02-03)

Version 5.1.29 is a maintenance release of the production 5.1 branch. It is suitable for use with many MySQL server versions, including 4.1, 5.0, 5.1, 5.4, 5.5, and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added a new connection property detectCustomCollations=[true|false]. When its value is false (which is the default value), the ConnectionImpl.buildCollationMapping() method, for detecting non-standard character sets or collations, will NOT be called during the instantiation of a connection, thus shortening the time for establishing a connection.

The introduction of this new property with the default value of false alters the old default behaviour of calling ConnectionImpl.buildCollationMapping() at each connection. If non-standard character sets or collations might be used, users should set detectCustomCollations=true. (Bug #17874902, Bug #71038)

Bugs Fixed

DatabaseMetaData.getKeywords() did not return the latest reserved words as found in MySQL Server's documentation (for example, in Keywords and Reserved Words). This fix makes the function generate, as per the JDBC API specification, a list of the latest MySQL and SQL standard keywords that are not also SQL92 (or, depending on the JDBC version in use, SQL2003) keywords. (Bug #17647584, Bug #70701)

Changes in MySQL Connector/J 5.1.28 (2013-12-23)

Version 5.1.28 is a maintenance release of the production 5.1 branch. It is suitable for use with many MySQL server versions, including 4.1, 5.0, 5.1, 5.4, 5.5 and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added support for live management for replication hosts. This enables users to change replication topographies (for example, adding or removing a host, or promoting a salve to master) without having to restart an application. See Live Reconfiguration of Replication Topography for details. (Bug #70842)

Bugs Fixed

A shadow declaration of com.mysql.jdbc.OperationNotSupportedException is removed from com.mysql.jdbc.RowDataDynamic. (Bug #17833137, Bug #70969)

An incorrect SQLException subclass was thrown during a query interruption. This fix creates a new, JDBC4-specific version of MySQLQueryInterruptedException, which subclasses MySQLNonTransientException. (Bug #17750877, Bug #70835)

A validation is added to check if blobSendChunkSize is negative (which is the case when maxAllowedPacket is set with a value less than or equal to “8203”) when useServerPrepStmts=true. It throws an exception when the validation fails. (Bug #17184082, Bug #69777)

When the connection property dontTrackOpenResources=true was used, the result set was closed after a Statement.close() was issued. (Bug #17164058, Bug #69746)

The timeout limit set by DriverManager.setLoginTimeout() was not honored during a handshake attempt. This fix adds the DriverManager.setLoginTimeout() control to the function NonRegisteringDriver.connect(): if the defined timeout is reached, the connection creation is cancelled and an exception is thrown. (Bug #17015317, Bug #69579)

The method Statement.closeOnCompletion() was not working. (Bug #16691047, Bug #68916)

With cacheResultSetMetadata=true, cacheCallableStmts=true, and cachePrepStmts=true, if a stored procedure that returns a result set was called, calling the stored procedure a second time resulted in a null pointer exception being thrown for initializeResultsMetadataFromCache. (Bug #11762713, Bug #55340)

Connector/J's SQL escape sequence processor was confused by multiple backslashes. The EscapeTokenizer has been re-factored to process multiple backslashes properly. (Bug #11759035, Bug #51313)

Changes in MySQL Connector/J 5.1.27 (2013-11-04)

Version 5.1.27 is a maintenance release of the MySQL Connector/J production 5.1 branch. It is suitable for use with many MySQL server versions, including 4.1, 5.0, 5.1, 5.4, 5.5 and 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added support for multi-master replication topographies, which can now be specified using the following host definition syntax: address=(host=hostname)(port=3306)(type=[master|slave]).

Added the flag CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA and support for authentication data up to a length of 2⁶⁴-1 bytes.

Added support for EXPLAIN for UPDATE and DELETE. Extended slow query warning with query execution plan for INSERT, REPLACE, UPDATE, and DELETE.

Bugs Fixed

When attempting to connect to a server using long, multibyte user name and database name, an Array Index Out Of Bounds Exception was thrown. This fix prevents the problem by increasing the space reserved for those strings. (Bug #17251955)

When setting a connection property with a value for blobSendChuckSize, largeRowSizeThreshold, or locatorFetchBufferSize, the suffix “G” was not recognized and caused an error to be thrown. With this fix, Connector/J now supports using “G” or “GB” for gigabyte for the purpose, as well as “KB” for kilobyte and “MB” for megabyte. (Bug #17015673, Bug #69452)

When there was an attempt to create a second branch with a duplicate ID on the same MySQL server instance, the XAException.errorCode returned by Connector/J was not equal to XAException.XAER_DUPID. (Bug #16979862, Bug #69506)

The SYSTEM TABLE type was handled inconsistently in different methods: DatabaseMetaData.getTableTypes() did not return system tables, and DatabaseMetaData.getTables() did not return all system tables. With this fix, the table types SYSTEM TABLE and SYSTEM VIEW are returned by getTableTypes(), and getTables() now returns tables from the internal schemas mysql and performance_schema as instances of SYSTEM TABLE and tables from information_schema as instances of SYSTEM VIEW. (Bug #16879239, Bug #69290)

JDBC authentication failed when there was a null byte in the scramble, because com.mysql.jdbc.MysqlIO.doHandshake only read up to the first null byte when reading in the first eight bytes of the scramble. (Bug #16723048, Bug #62469)

When rewriteBatchedStatements=true and useAffectedRows=true were set, executeBatch() did not return the number of affected rows as expected, but always returned a “1,” even if no rows were affected (for example, when an ON DUPLICATE KEY UPDATE clause was applicable but the data needed no changes). The “1” was actually a hardwired value, a workaround for a known issue on the server side, which does not return the number of affected rows in such cases. This fix makes Connector/J just return the value given by the server anyway, which means the returned number of affected rows is reliable now if Connector/J returns a “0” [no rows affected]; non-zero values returned should not be trusted though. (Bug #16442951, Bug #68562)

In a replication-aware deployment, when the master was not reachable, new connections could not be made, or the replication driver just hanged. As part of the new multiple-master support feature, users can now set the property allowMasterDownConnections=true to allow connections to be established even when no master hosts are available. (Bug #11757979, Bug #50105, Bug #16443992, Bug #63354)

Calling ResultSet.absolute(0) caused Connector/J to throw an error. This fix makes ResultSet.absolute(0) behave like ResultSet.beforeFirst(), as required by the JDBC specifications. (Bug #11749136, Bug #38252)

After setting the connection property yearIsDateType=false, the method ResultSet.getMetaData().getColumnClassName() still returned the Java type of a YEAR column as as java.sql.Date although internally it was being treated as java.sql.Short. This fix corrects the metadata for a YEAR column under this situation, so that the correct Java type of java.sql.Short is returned. Please note that the method ResultSet.getMetaData().getColumnType(), however, returns java.sql.Types.DATE irrespective of the yearIsDateType setting. (Bug #11748097, Bug #35115)

The string returned by DatabaseMetaData.getDriverVersion() contains the unexpanded expression “${svn.Revision}” or “${bzr.revision-id}” instead of the actual revision number of Connector/J. (Bug #50538, Bug #11758345)

Changes in MySQL Connector/J 5.1.26 (2013-08-01)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added a toString() method to the PreparedStatementWrapper class to help debug prepared statements. (Bug #42267, Bug #11751418)

Bugs Fixed

An out of memory error occured when the compression protocol was enabled with the connection option useCompression=true. This fix stops the memory leak that caused the error by making sure that CompressedInputStream releases its reference to the connection object when the input stream closes. (Bug #68400, Bug #16478043)

The results returned by the method DatabaseMetaData.getIndexInfo() were not sorted in the order described in the JDBC specification (NON_UNIQUE, TYPE, INDEX_NAME, and ORDINAL_POSITION). (Bug #68098, Bug #16224299)

DatabaseMetaData.getColumns() threw an MySQLSyntaxErrorException if the schema contains tables with ANSI quoted names with leading and trailing back quotes (`). When those names were passed as parameters in unquoted form, Connector/J treated them as quoted because of the back quotes, and thus the error. This fix adds the behavior that when the connection property pedantic was set to true, methods like DatabaseMetaData.getColumns() treat all parameters as unquoted. (Bug #65871, Bug #14598704)

Connector/J silently ignored calls to ResultSet.updateRow when the cursor was on the insert row. This fix ensures that an SQLException is thrown with those calls, as described in the JDBC specification. (Bug #45757, Bug #11754192)

Changes in MySQL Connector/J 5.1.25 (2013-05-01)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

When connecting to MySQL server 5.6 or later, Connector/J now sends to the server a number of connection attributes that will be exposed in the relevant PERFORMANCE_SCHEMA tables. By default, the following attributes are sent:

client_version: version number of MySQL Connector/J

client_name: “MySQL Connector Java”

client_license: “commercial”" or “GPL,” depending on the build used

runtime_vendor: JVM vendor name

runtime_version: JVM version

The list of attributes can be augmented, and the sending of the attributes can be suppressed. See the description for connectionAttributes in Driver/Datasource Class Names, URL Syntax and Configuration Properties for Connector/J for details.

Bugs Fixed

The “mysql-connector-java-5.1.24.jar” prepared for maven.org contained the artifact, META-INF/INDEX.LIST, which incorrectly pointed to “mysql-connector-java-5.1.24-bin.jar”. For Connector/J 5.1.25, META-INF/INDEX.LIST has been corrected and now points to “mysql-connector-java-5.1.25.jar”.

The work around for “mysql-connector-java-5.1.24.jar” prepared for maven.org is to rename the JAR file to “mysql-connector-java-5.1.24-bin.jar” or to download the MySQL Connector/J 5.1.24 driver from http://dev.mysql.com/downloads/connector/j/. (Bug #16574419)

The getDriverName() function would return “MySQL-AB JDBC Driver” as the driver name. This fix changes the driver name string to “MySQL Connector Java”. (Bug #16436511)

With the connection option rewriteBatchedStatements=true, after a batch insert, the batchStatement was closed twice. This caused some unnecessary throwing and catching of errors, impacting code performance. This fix nullifies the batchStatement after the first calling of the close() method in order to avoid a second closing. (Bug #69308, Bug #16879267)

The DatabaseMetaData methods of getFunctions and getFunctionColumns returned information for both stored functions and procedures when value of the connection option useInformationSchema was false. On the other hand, getProcedures and getProcedureColumns always return information for both stored procedures and functions. The behaviours of the four functions are inconsistent with the idea introduced since JDBC4 to separate the “get” functions for stored functions and procedures. The functions are modified as follows:

getFunctions and getFunctionColumns now only return information for stored functions (not for stored procedures), irrespective of the value of useInformationSchema.

For getProcedures and getProcedureColumns, in order to maintain backward compatibility with pre-JDBC4 implementations, a new connection option, getProceduresReturnsFunctions, is created, whose default value of true makes getProcedures and getProcedureColumns return information for both stored procedures and functions. Setting the option to false makes the functions return only information for stored procedures.

(Bug #69298, Bug #16845965)

ReplicationConnection.isMasterConnection(), which is intended to check if the current connection is the master connection, would always return “false”. This fix implements logic that returns “true” if the current connection is the master connection. (Bug #68763, Bug #16545334)

When using Connector/J in a replication deployment, all of the slave connections would not be pinged. This fix ensures that all active physical connections to slaves are pinged, and that communication exceptions are thrown if:

The master connection ping fails, and the connection is currently set to use the master connection via Connection.setReadOnly(false).

The Connection object is set to use the slave via Connection.setReadOnly(true), and the currently-selected slave connection ping fails.

(Bug #68733, Bug #16526938)

Producing Connector/J JAR packages in Eclipse using Ant tasks would result in a JAR file without compiled class files. Compile-related tasks in the Ant script would direct compilation targets to the bin directory (for Eclipse compatibility), while JAR related tasks were directed to {buildDir}/${fullProdName}. This fix changes the JAR task reference to ${compiler.output} instead of {buildDir}/${fullProdName}. (Bug #68664, Bug #16486957)

Tomcat failed to stop abandoned connection cleanup threads. The fix for Bug#65909 introduced the ability to stop daemon threads started by the Connector/J driver but it also cleared references from daemon threads to the parent classloader. When the clearReferencesStopThreads property is set to “true” in context.xml, Tomcat analyzes classloaders to detect and stop lost threads. This fix ensures that abandoned connection cleanup threads retain a reference to the parent classloader. (Bug #68556, Bug #16443387)

The DatabaseMetaData.getProcedureColumns() method returned wrong COLUMN_TYPE values. (Bug #68307, Bug #16707803)

An exception occurred if NULL was passed to a stored procedure INOUT parameter. (Bug #60816, Bug #12800874)

The result set returned by getTables did not contain all the columns as specified in the JDBC specification. Even though the missing columns are not meaningful to MySQL, the getTables method is modified to add null fields to the result set in order to make it compliant with the JDBC specification. Other methods including getColumns, getFunctionColumns, getFunctions, getProcedureColumns, and getUDTs are also modified to address the same issue pertaining to them. (Bug #44451, Bug #11753081)

Changes in MySQL Connector/J 5.1.24 (2013-03-12)

Bugs Fixed

The Statement.cancel() was made less susceptible to deadlocking, to allow application servers to immediately cancel operations that fail due to transaction timeouts or network issues. The abortInternal() method that was previously part of the MySQLConnection interface is now available through the Connection interface, so it can be tested for and called if available. (Bug #16224249)

When a statement was accessing a table in streaming mode, terminating the statement by issuing KILL QUERY from another session could cause a SQLException “Query execution was interrupted” and a stall when the original session issued a ResultSet.close() or Statement.close() method call. This issue resulted from a race condition and so could happen intermittently. (Bug #16198772, Bug #64204)

When the connection options noDatetimeStringSync and useTimezone were specified together, which is not allowed, the error message referred to an incorrect option name noDatetimeSync. (Bug #16061665, Bug #68011)

The connection.getQueryTimeoutKillsConnection() method could be called with a null parameter, causing NullPointerException errors and stack traces. The error depended on a race condition and so occurred intermittently. (Bug #13943631, Bug #64805)

Changes in MySQL Connector/J 5.1.23 (2013-02-05)

Fixes bugs found since release 5.1.22. Also adds support and test cases for several new features from MySQL Server 5.6.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

New test cases cover new features from MySQL Server 5.6:

Explicit partition selection syntax.

EXCHANGE PARTITION syntax.

Transportable tablespaces syntax: LOCK TABLES ... FOR EXPORT.

CREATE TABLE ... DATA DIRECTORY = '/absolute/path/to/directory/' syntax for InnoDB tables.

New ALTER TABLE syntax: ALGORITHM and LOCK keywords.

Added support of password expiration protocol. This introduces a new Boolean connection property disconnectOnExpiredPasswords:

If disconnectOnExpiredPasswords=true and the password has expired, the connection will be rejected by server with ErrorCode == 1820 (ER_MUST_CHANGE_PASSWORD).

If disconnectOnExpiredPasswords=false, the connection enters “sandbox” mode, where all commands except SET PASSWORD = ... and SET PASSWORD FOR CURRENT_USER() = ... cause an error to be thrown. The user needs to reconnect though, after setting the password, because Connector/J requires additional information from the server that is not available in the “sandbox” mode.

Static charset/collation maps were updated, particularly for the ucs2_unicode_ci and utf8_unicode_ci collations.

Connection.setReadOnly() will take advantage of server-side support for read-only transactions present in MySQL 5.6 and newer. Calling .isReadOnly() will incur a round-trip if useLocalSessionState is not enabled.

The driver now allows the mechanism for caching MySQL server configuration values replaceable at runtime, via the serverConfigCacheFactory property. The default is an implementation that is a per-VM concurrent map, keyed by URL. The driver will invalidate cache entries when SQLException exceptions that indicate communications errors are thrown (on the assumption that the server has been or is restarting). The driver also invalidates cache entries if the server version that is being connected to differs from the one that was present when the cached values were populated.

To replace the default implementation, implement CacheAdapterFactory<String, Map<String, String>>, and specify the fully-qualified class name of this implementation for the serverConfigCacheFactory connection option.

Bugs Fixed

Stack trace used for point-of-origin in log and exception messages caused a Permgen leak when an application was redeployed, because the WebappClassloader could not be garbage collected. We no longer store the entire stack trace, only the calling class and method, and only when using the usage advisor or when profiling. (Bug #16097851, Bug #67954)

With the connection setting useCompression=true, the SQL statement LOAD DATA LOCAL INFILE could cause a java.net.SocketException error due to a broken pipe. (Bug #15895369, Bug #11237)

The nativeSQL() method would always truncate fractional seconds rather than preserving the fractional part in the output string. Now Connector/J checks the server version: it preserves the fractional part for MySQL 5.6.4 and greater, and truncates the fractional part for older versions. (Bug #14748459, Bug #60598)

With the new MySQL server password hashing feature enabled, different results could be returned from ResultSet and CachedRowSet. The test suite was modified to not perform comparison of PASSWORD() results when the setting old_passwords=2, because with SHA-256 password hashing enabled, the function return results are nondeterministic. (Bug #14665141)

The cleanup thread for abandoned connections in the NonRegisteringDriver class was refactored to have a static shutdown method. Memory was allocated but never released. If you encountered this leak problem, implement the context listener in your application with the AbandonedConnectionCleanupThread.shutdown() call in the contextDestroyed method. This issue was found in applications running under the Tomcat application server, but it might have also applied to other application servers.

For example:

@WebListener
public class YourThreadsListener implements ServletContextListener {
   public void contextDestroyed(ServletContextEvent arg0) {
      try {
          AbandonedConnectionCleanupThread.shutdown();
      } catch (InterruptedException e) {
      }
   }
   ...
}

Note that if container does not support annotations, you add the description to web.xml:

<listener>
   <listener-class>user.package.YourThreadsListener</listener-class>
</listener>

(Bug #14570236, Bug #65909)

With the connection parameter rewriteBatchedStatements=true, ResultSetRow.getTimeFast could give an incorrect value for TIME columns containing a fractional part. (Bug #14260352)

If a timestamp value was passed through prepared statement parameters, fractional-second precision was stripped off, even if the underlying field (such as VARCHAR(255)) could store the full value. A workaround was to convert the timestamp value to a string when specifying the prepared statement argument, for example prepped_stmt.setString(1,time_stamp.toString(). This was partly fixed in 5.1.19, but that fix did not cover the case with the setting useLegacyDatetimeCode=true. (Bug #11750017, Bug #40279, Bug #60584)

executeQuery() in Statement.java let TRUNCATE TABLE queries be executed, although that method is supposed to block any request that modifies the database. TRUNCATE TABLE and RENAME TABLE are now filtered for executeQuery(). (Bug #11748257, Bug #35653)

Compiling Connector/J from source failed when using a non-Sun/Oracle JDK, because the Ant target compile-testsuite contained a AppletRegressionTest that used a Sun-specific class (sun.applet.AppletSecurity). This fix removes the AppletRegressionTest and thus the dependence on the Sun class from the build process. (Bug #11745319, Bug #13509)

Changes in MySQL Connector/J 5.1.22 (2012-09-11)

Fixes bugs found since release 5.1.21.

Bugs Fixed

Performance: The com.mysql.jdbc.getCharsetNameForIndex() method was made more efficient, resulting in better performance for queries against tables containing many columns with string data types. (Bug #14236302, Bug #65508)

The LoadBalancingConnectionProxy.pickNewConnection() method could incorrectly flag the current connection as invalid after testing another connection. The selection process could choose another (potentially offline) host, leading to a “connection is closed” error when trying to use a connection after re-balancing:

No operations allowed after connection closed.
Connection closed after inability to pick valid new connection
during fail-over.

(Bug #14563127)

With profileSQL=true and useNanosForElapsedTime=true specified in the connection URL, query and fetch duration were not reported correctly. The com.mysql.jdbc.MysqlIO.sqlQueryDirect() method always measured times in milliseconds rather than switching between milliseconds and nanoseconds. (Bug #14273046, Bug #57662)

ResultSet objects created by the getGeneratedKeys() method were not being automatically closed, leading to potential memory leaks if the application did not explicitly close the ResultSet objects. (Bug #14192873, Bug #65503)

Implemented the getVersionColumns() method, which formerly always returned an empty result set. Now this method returns the timestamp columns that are updated every time a row is changed. (Bug #13636546, Bug #63800)

Connecting to a server that used a UCS2 character set would throw an exception:

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error
in your SQL syntax; check the manual that corresponds to your MySQL server
version for the right syntax to use near '??' at line 1

Now, Connector/J sets characterEncoding implicitly to UTF-8 when the server character set is UCS2. Because the Connector/J UTF-8 implementation does not cover all UCS-2 characters, note that truncation might occur in some cases. (Bug #11751035, Bug #41752)

Connector/J now avoids synchronization issues in terms of locking order and prepared statements.

Changes in MySQL Connector/J 5.1.21 (2012-07-03)

Fixes bugs found since release 5.1.20.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J applications can now connect to MySQL servers that use the PAM authentication system. See Connecting Using PAM Authentication for details about the Connector/J support, and The PAM Authentication Plugin for information about this authentication feature of the MySQL server. (Bug #13608088)

Bugs Fixed

When a new instance of authentication plugin is obtained (either the default one, or one named in Auth Challenge Packet or in Auth Method Switch Request Packet), it must be checked if plugin's confidentiality requirements are satisfied. If the plugin requested in the Auth Method Switch Request Packet required a secure connection, an insecure connection could be established instead. (Bug #13980303)

With a connection encoding of gbk and a server encoding of latin1, a call such as PreparedStatement.setString(1, "0f0f0702") could throw an exception java.lang.StringIndexOutOfBoundsException. (Bug #13943893, Bug #64731)

When Connector/J was connected to a MySQL 5.5 server, the error message for an invalid query could be returned in the wrong character set and appear garbled. (Bug #13702427, Bug #64205)

By default, if an I/O error occurred while executing a query a deadlock could occur as Connector/J attempted to close all open statements (by calling method ConnectionImpl#closeAllOpenStatements) The deadlock would occur if any execute*(*) method of another instance of the StatementImpl class was called by another thread. A workaround was to set the property dontTrackOpenResources to true. (Bug #12590053, Bug #61247)

Specifying a non-existent character set in the characterEncoding or characterSetResults connection options could produce a NullPointerException error. The error could occur with a typographical mistake, such as using a hyphen instead of an underscore in the name. (Bug #11749010, Bug #37931)

The timezone entry was missing for “MEST - Middle European Summer Time”. (Bug #11748548, Bug #36662)

Changes in MySQL Connector/J 5.1.20 (2012-05-01)

Fixes bugs found since release 5.1.19.

Bugs Fixed

Important Change: This fix corrects an issue introduced in Connector/J 5.1.19 that caused connection errors with MySQL 4.1 and earlier servers. A java.lang.ClassCastException exception occurred during connection initialization when com.mysql.jdbc.ConnectionImpl.buildCollationMapping() interpreted the output of the SHOW COLLATION statement. (Bug #13958793)

Using Connector/J 5.1.19 in combination with JBoss could result in an error while establishing a connection: MySQLNonTransientConnectionException: Bad handshake. This issue occurred when using the old-style password hash, which requires the mysql_old_password plugin during handshake. A workaround was to replace the 16-byte hash with a 41-byte one, as explained in Password Hashing in MySQL. (Bug #13990612, Bug #64983)

A java.lang.StringIndexOutOfBoundsException exception could occur when manipulating date/time values with fractional seconds. (Bug #13960556)

A MySQLSyntaxErrorException could occur when calling certain methods while connected to a MySQL 5.6.5 or higher server. Affected methods included StatementImpl.execute() and PreparedStatement.execute(). The cause was the removal of the SET OPTION syntax in the MySQL Server. The methods were modified to use the newer SET syntax internally. (Bug #13955027)

The savepoint identifier generated by the java.sql.Connection#.setSavepoint() function could be misinterpreted as a floating-point number, for example values such as 123e10 or 123e10foo. Such values could cause replication errors on slave servers because the values are not quoted in the binary log. The fix ensures that the savepoint identifiers do not begin with digits. (Bug #11763271, Bug #55962)

If the string limit was used in a column name, prepared statements incorrectly treated the statement as if it used a LIMIT clause. For example, a prepared statement with maxrows set to 0 could incorrectly reuse the value from a previous call to setMaxRows(). This issue applied to both quoted and unquoted column names, and server-side and client-side prepared statements. (Bug #11748492, Bug #36478)

Changes in MySQL Connector/J 5.1.19 (April 2012)

Fixes bugs found since release 5.1.18.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

For a UTF-8 table using a collation other than the default (utf8_general_ci), the precision of the ResultSetMetaData could be different from the precision specified in the CREATE TABLE statement. The fix corrects the return value from getMaxBytesPerChar().

This fix changes the behavior of some connection string parameters. useDynamicCharsetInfo no longer has any effect. With the setting cacheServerConfiguration=true, the cached settings also include the results of the SHOW CHARACTER SET statement. (Bug #13495590, Bug #63456)

Added support for pluggable authentication. via the com.mysql.jdbc.AuthenticationPlugin interface (which extends the standard “extension” interface). Examples are in com/mysql/jdbc/authentication and in testsuite.regression.ConnectionRegressionTest. This feature introduces three new connection properties:

authenticationPlugins defines a comma-delimited list of classes that implement com.mysql.jdbc.AuthenticationPlugin and are used for authentication unless disabled by the disabledAuthenticationPlugins property.

disabledAuthenticationPlugins defines a comma-delimited list of classes implementing com.mysql.jdbc.AuthenticationPlugin or mechanisms, i.e. mysql_native_password. The authentication plugins or mechanisms cannot be used for authentication. Authentication will fail if it requires one of these classes. It is an error to disable the default authentication plugin, either the one named by defaultAuthenticationPlugin property or the hardcoded one if defaultAuthenticationPlugin property is not set.

defaultAuthenticationPlugin defines the name of a class implementing com.mysql.jdbc.AuthenticationPlugin, which is used as the default authentication plugin. It is an error to use a class that is not listed in authenticationPlugins and is not one of the built-in plugins. It is an error to set as default a plugin that is disabled by being listed in the disabledAuthenticationPlugins property. It is an error to set this value to null or the empty string; there must be at least one valid default authentication plugin specified for the connection, meeting all the constraints listed above.

Bugs Fixed

Performance: An unnecessary call to bind() during socket operations could limit scalability on some platforms. (Bug #13875070, Bug #63811)

setMaxRows was not correctly processed during metadata collection for client-side prepared statements, causing the entire result set to be fetched and possibly leading to an out-of-memory error. (Bug #13839395, Bug #64621)

A problem with processing escape sequences (in com.mysql.jdbc.EscapeProcessor#escapeSQL) could cause certain statements to fail. For example, a CREATE TABLE statement with a clause such as CONSTRAINT `fk_` was not parsed correctly. (Bug #13612316, Bug #63526)

The sjis character set was incorrectly mapped to MS392, which was in turn mapped to cp932, resulting in garbled characters in some cases. In Connector/J 5.1.19, the mappings of character sets and collations were refactored to avoid such multi-step mappings. (Bug #13589875)

Underprivileged execution of stored procedures fixed. (Bug #13508993, Bug #61203)

A combination of failover connections, proxied or prepared statements, and database connection pool could cause a memory leak due to improper implementation of equals(). (Bug #13441718, Bug #63284)

com.mysql.jdbc.ResultSetRow.getTimestampFast() did not account for all valid TIME lengths. (Bug #60582, Bug #16592635)

The Connection.changeUser() method did not check for closed connections, leading to NullPointerException errors when this method was called on a closed connection.

Reduced the memory overhead for server-side prepared statements. Each prepared statement allocated a 4K buffer for converting streams. Now this allocation is skipped when no set*Stream() methods have been used.

Changes in MySQL Connector/J 5.1.18 (2011-10-04)

Fixes bugs found since release 5.1.17.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added the function MYSQL_INDEX_TO_MYSQL_CHARSET to retrieve the server charset name, using an index instead of parsing variables to CharsetMapping.java

Bugs Fixed

The LRUCache implementation removed the eldest entry, rather than the least-recently accessed. (Bug #13036537)

Changed cacheCallableStatements to cacheCallableStmts in maxPerformance.properties, to allow proper caching. (Bug #13036309)

Added a new ant flag, com.mysql.jdbc.junit.fork, which controls whether JUnit will fork new processes for testing. Valid values for the flag are:

on: fork new process; the default and legacy behavior.

off: do not fork new process; required for Windows, or process fork failure errors will result while running the test suite via ant on Windows.

(Bug #12784170)

Not putting a space between VALUES() and ON DUPLICATE KEY UPDATE causes connector/J to both (A) Rewrite the query, although it includes an ON UPDATE statement and (B) To generate the wrong query with multiple ON DUPLICATE KEY statements. (Bug #12565726)

The loadBalanceBlacklistTimeout option was not functioning properly. Working connections were not being removed from the blacklist. (Bug #63135)

The "old" warnings were returned when Statement.getWarnings() was called after Statement.clearWarnings(). (Bug #61866, Bug #12791594)

Connector/J now guards against the condition where a call to KILL QUERY will kill the next query issued by the server, if no query is in process. (Bug #61501)

Calling Statement.cancel() on a statement that isn't currently executing, will cause a later-executed query on the same connection to be unexpectedly canceled. The driver now guards against this condition, but it is an underlying server issue. The MySQL statement KILL QUERY (which is what the driver uses to implement Statement.cancel()) is rather non-deterministic, and thus the use of Statement.cancel() should be avoided if possible. (Bug #61501)

A connection could not be established when the URL contained both sessionVariables and characterEncoding. (Bug #61201, Bug #12649557)

Reverting changes made to ConnectionImpl.java, the private boolean characterSetNamesMatches function.

Changes in MySQL Connector/J 5.1.17 (2011-07-07)

Fixes bugs found since release 5.1.16.

Bugs Fixed

LIKE was not optimized in then server when run against INFORMATION_SCHEMA tables and no wildcards were used. Databases/tables with '_' or '%' in their names (escaped or not) are handled by this code path, although slower, since it is rare to find these characters in table names in SQL. If there is a '_' or '%' in the string, LIKE takes care of that; otherwise, '=' is now used instead. The only exception is the information_schema database, which is handled separately. The patch covers both getTables() and getColumns(). (Bug #61332)

The first call to a stored procedure failed with “No Database Selected”. The workaround introduced in DatabaseMetaData.getCallStmtParameterTypes to fix the server bug where SHOW CREATE PROCEDURE was not respecting lowercase table names was misbehaving when the connection was not attached to a database and on case-insensitive operating systems. (Bug #61150)

There was a concurrency bottleneck in Java's character set encoding/decoding when converting bytes to/from String values.

Important

No longer use String.getBytes(...), or new String(byte[]...). Use the StringUtils method instead.

(Bug #61105)

Connector/J now avoids a concurrent bottleneck in Java's character set encoding/decoding when converting bytes to and from instances of String. (Bug #61105, Bug #12622056)

Changes in MySQL Connector/J 5.1.16 (Not released)

Fixes bugs found since release 5.1.15.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

The Connection.isServerLocal() method can now determine if a connection is against a server on the same host.

Bugs Fixed

When auto-reconnect was used with cacheServerConfiguration, errors could occur when the host changed (in an HA setup, for example). (Bug #12325877)

DBMD.getTables and getColumns fail with table names that contain a dot (like "junk_[Sp:e,c/ C-h+a=.r]"). The workaround is to use useInformationSchema=True. (Bug #11782297)

ResultSetRow.getTimestampFast and getTime had invalid offsets. (Bug #60313)

Fixed a timestamp offset bug in com.mysql.jdbc.ResultSetRow.getTimestampFast(). (Bug #60313, Bug #11890729)

wasNull was not set for a DATE field with the value of 0000-00-00 in getDate(), although zeroDateTimeBehavior is defined as convertToNull. (Bug #57808)

A bypassing of the server protocol bug, where the DB should be null-terminated whether it exists or not. This affects COM_CHANGE_USER. (Bug #54425)

Fixed a bug where Connector/J would kill the matching ConnectionID, but on the wrong server. (Bug #54135)

Changes in MySQL Connector/J 5.1.15 (2011-02-09)

Fixes bugs found since release 5.1.14.

Bugs Fixed

Optional logging class com.mysql.jdbc.log.Log4JLogger was not included in the source/binary package for 5.1.14.

5.1.15 will ship with an SLF4J logger (which can then be plugged into Log4J). Unfortunately, it is not possible to ship a direct Log4J integration because the GPL is not compatible with Log4J's license. (Bug #59511, Bug #11766408)

The hard-coded list of reserved words in Connector/J was not updated to reflect the list of reserved words in MySQL Server 5.5. (Bug #59224)

MySqlProcedure accepted null arguments as parameters, however the JDBC meta data did not indicate that. (Bug #38367, Bug #11749186)

Using Connector/J to connect from a z/OS machine to a MySQL Server failed when the database name to connect to was included in the connection URL. This was because the name was sent in z/OS default platform encoding, but the MySQL Server expected Latin1.

It should be noted that when connecting from systems that do not use Latin1 as the default platform encoding, the following connection string options can be useful: passwordCharacterEncoding=ASCII and characterEncoding=ASCII. (Bug #18086, Bug #11745647)

Changes in MySQL Connector/J 5.1.14 (2010-12-06)

Fixes bugs found since release 5.1.13.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J's dependence on the org.apache.commons.logging package has been removed. (Bug #11756133, Bug #48013)

Connector/J's load-balancing functionality only allowed the following events to trigger failover:

Transaction commit/rollback

CommunicationExceptions

Matches to user-defined Exceptions using the loadBalanceSQLStateFailover, loadBalanceSQLExceptionSubclassFailover or loadBalanceExceptionChecker property.

This meant that connections where auto-commit was enabled were not balanced, except for Exceptions, and this was problematic in the case of distribution of read-only work across slaves in a replication deployment.

The ability to load-balance while auto-commit is enabled has now been added to Connector/J. This introduces two new properties:

loadBalanceAutoCommitStatementThreshold - defines the number of matching statements which will trigger the driver to (potentially) swap physical server connections. The default value (0) retains the previously established behavior that connections with auto-commit enabled are never balanced.

loadBalanceAutoCommitStatementRegex - the regular expression against which statements must match. The default value (blank) matches all statements.

Load-balancing will be done after the statement is executed, before control is returned to the application. If rebalancing fails, the driver will silently swallow the resulting Exception (as the statement itself completed successfully). (Bug #55723)

Bugs Fixed

Connection failover left slave/secondary in read-only mode. Failover attempts between two read-write masters did not properly set this.currentConn.setReadOnly(false). (Bug #58706)

Connector/J mapped both 3-byte and 4-byte UTF8 encodings to the same Java UTF8 encoding.

To use 3-byte UTF8 with Connector/J set characterEncoding=utf8 and set useUnicode=true in the connection string.

To use 4-byte UTF8 with Connector/J configure the MySQL server with character_set_server=utf8mb4. Connector/J will then use that setting as long as characterEncoding has not been set in the connection string. This is equivalent to autodetection of the character set. (Bug #58232)

The CallableStatementRegression test suite failed with a Null Pointer Exception because the OUT parameter in the I__S.PARAMETERS table had no name, that is COLUMN_NAME had the value NULL. (Bug #58232)

DatabaseMetaData.supportsMultipleResultSets() was hard-coded to return false, even though Connector/J supports multiple result sets. (Bug #57380)

Using the useOldUTF8Behavior parameter failed to set the connection character set to latin1 as required.

In versions prior to 5.1.3, the handshake was done using latin1, and while there was logic in place to explicitly set the character set after the handshake was complete, this was bypassed when useOldUTF8Behavior was true. This was not a problem until 5.1.3, when the handshake was modified to use utf8, but the logic continued to allow the character set configured during that handshake process to be retained for later use. As a result, useOldUTF8Behavior effectively failed. (Bug #57262)

Invoking a stored procedure containing output parameters by its full name, where the procedure was located in another database, generated the following exception:

Parameter index of 1 is out of range (1, 0)

(Bug #57022)

When a JDBC client disconnected from a remote server using Connection.close(), the TCP connection remained in the TIME_WAIT state on the server side, rather than on the client side. (Bug #56979)

Leaving Trust/ClientCertStoreType properties unset caused an exception to be thrown when connecting with useSSL=true, as no default was used. (Bug #56955)

When load-balanced connections swap servers, certain session state was copied from the previously active connection to the newly selected connection. State synchronized included:

Auto-commit state

Transaction isolation state

Current schema/catalog

However, the read-only state was not synchronized, which caused problems if a write was attempted on a read-only connection. (Bug #56706)

When using Connector/J configured for failover (jdbc:mysql://host1,host2,... URLs), the non-primary servers re-balanced when the transactions on the master were committed or rolled-back. (Bug #56429)

An unhandled Null Pointer Exception (NPE) was generated in DatabaseMetaData.java when calling an incorrectly cased function name where no permission to access mysql.proc was available.

In addition to catching potential NPEs, a guard against calling JDBC functions with db_name.proc_name notation was also added. (Bug #56305)

Added diagnostic information to SQLException messages that are caused by usage of a closed load-balanced connection, to help clarify the root cause of a connection closure. (Bug #56200)

Attempting to use JDBC4 functions on Connection objects resulted in errors being generated:

Exception in thread "main" java.lang.AbstractMethodError:
com.mysql.jdbc.LoadBalancedMySQLConnection.createBlob()Ljava/sql/Blob;
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at
com.mysql.jdbc.LoadBalancingConnectionProxy.invoke(LoadBalancingConnectionProxy.java:476)
   at $Proxy0.createBlob(Unknown Source)

(Bug #56099)

Connector/J could exit with a “parameter index out of range” error when executing stored procedures. (Bug #55328, Bug #11762701)

Changes in MySQL Connector/J 5.1.13 (2010-06-24)

Fixes bugs found since release 5.1.12.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Connector/J did not support utf8mb4 for servers 5.5.2 and newer.

Connector/J now auto-detects servers configured with character_set_server=utf8mb4 or treats the Java encoding utf-8 passed using characterEncoding=... as utf8mb4 in the SET NAMES= calls it makes when establishing the connection. (Bug #54175)

Bugs Fixed

The method unSafeStatementInterceptors() contained an erroneous line of code, which resulted in the interceptor being called, but the result being thrown away. (Bug #53041)

There was a performance regression of roughly 25% between r906 and r907, which appeared to be caused by pushing the Proxy down to the I/O layer. (Bug #52534)

Logic in implementations of LoadBalancingConnectionProxy and LoadBalanceStrategy behaved differently as to which SQLExceptions trigger failover to a new host. The former looked at the first two characters of the SQLState:

if (sqlState.startsWith("08"))
...

The latter used a different test:

if (sqlEx instanceof CommunicationsException
  || "08S01".equals(sqlEx.getSQLState())) {
...

This meant it was possible for a new Connection object to throw an Exception when the first selected host was unavailable. This happened because MySqlIO.createNewIO() could throw an SQLException with a SQLState of “08001”, which did not trigger the “try another host” logic in the LoadBalanceStrategy implementations, so an Exception was thrown after having only attempted connecting to a single host. (Bug #52231)

In the file DatabaseMetadata.java, the function private void getCallStmtParameterTypes failed if the parameter was defined over more than one line by using the '\n' character. (Bug #52167)

The catalog parameter, PARAM_CAT, was not correctly processed when calling for metadata with getMetaData() on stored procedures. This was because PARAM_CAT was hardcoded in the code to NULL. In the case where nullcatalogmeanscurrent was true, which is its default value, a crash did not occur, but the metadata returned was for the stored procedures from the catalog currently attached to. If, however, nullcatalogmeanscurrent was set to false then a crash resulted.

Connector/J has been changed so that when NULL is passed as PARAM_CAT it will not crash when nullcatalogmeanscurrent is false, but rather iterate all catalogs in search of stored procedures. This means that PARAM_CAT is no longer hardcoded to NULL (see Bug #51904). (Bug #51912)

A load balanced Connection object with multiple open underlying physical connections rebalanced on commit(), rollback(), or on a communication exception, without validating the existing connection. This caused a problem when there was no pinging of the physical connections, using queries starting with “/* ping */”, to ensure they remained active. This meant that calls to Connection.commit() could throw a SQLException. This did not occur when the transaction was actually committed; it occurred when the new connection was chosen and the driver attempted to set the auto-commit or transaction isolation state on the newly chosen physical connection. (Bug #51783)

The rollback() method could fail to rethrow a SQLException if the server became unavailable during a rollback. The errant code only rethrew when ignoreNonTxTables was true and the exception did not have the error code 1196, SQLError.ER_WARNING_NOT_COMPLETE_ROLLBACK. (Bug #51776)

When the allowMultiQueries connection string option was set to true, a call to Statement.executeBatch() scanned the query for escape codes, even though setEscapeProcessing(false) had been called previously. (Bug #51704)

When a StatementInterceptor was used and an alternate ResultSet was returned from preProcess(), the original statement was still executed. (Bug #51666)

Objects created by ConnectionImpl, such as prepared statements, hold a reference to the ConnectionImpl that created them. However, when the load balancer picked a new connection, it did not update the reference contained in, for example, the PreparedStatement. This resulted in inserts and updates being directed to invalid connections, while commits were directed to the new connection. This resulted in silent data loss. (Bug #51643)

jdbc:mysql:loadbalance:// would connect to the same host, even though loadBalanceStrategy was set to a value of random, and multiple hosts were specified. (Bug #51266)

An unexpected exception when trying to register OUT parameters in CallableStatement.

Sometimes Connector/J was not able to register OUT parameters for CallableStatements. (Bug #43576)

Changes in MySQL Connector/J 5.1.12 (2010-02-18)

Fixes bugs found since release 5.1.11.

Bugs Fixed

The catalog parameter was ignored in the DatabaseMetaData.getProcedure() method. It returned all procedures in all databases. (Bug #51022)

A call to DatabaseMetaData.getDriverVersion() returned the revision as mysql-connector-java-5.1.11 ( Revision: ${svn.Revision} ). The variable ${svn.Revision} was not replaced by the SVN revision number. (Bug #50288)

Changes in MySQL Connector/J 5.1.11 (2010-01-21)

Fixes bugs found since release 5.1.10.

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Replication connections, those with URLs that start with jdbc:mysql:replication, now use a jdbc:mysql:loadbalance connection for the slave pool. This means that it is possible to set load balancing properties such as loadBalanceBlacklistTimeout and loadBalanceStrategy to choose a mechanism for balancing the load, and failover or fault tolerance strategy for the slave pool. (Bug #49537)

Bugs Fixed

NullPointerException sometimes occurred in invalidateCurrentConnection() for load-balanced connections. (Bug #50288)

The deleteRow method caused a full table scan, when using an updatable cursor and a multibyte character set. (Bug #49745)

For pooled connections, Connector/J did not process the session variable time_zone when set using the URL, resulting in incorrect timestamp values being stored. (Bug #49700)

The ExceptionInterceptor class did not provide a Connection context. (Bug #49607)

Ping left closed connections in the liveConnections map, causing subsequent Exceptions when that connection was used. (Bug #48605)

Using MysqlConnectionPoolDataSource with a load-balanced URL generated exceptions of type ClassCastException:

ClassCastException in MysqlConnectionPoolDataSource
Caused by: java.lang.ClassCastException: $Proxy0
   at
com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource.getPooledConnection(MysqlConne
ctionPoolDataSource.java:80)

java.lang.ClassCastException: $Proxy2
 at com.mysql.jdbc.jdbc2.optional.StatementWrapper.executeQuery(StatementWrapper.java:744)

(Bug #48486)

The implementation for load-balanced Connection used a proxy, which delegated method calls, including equals() and hashCode(), to underlying Connection objects. This meant that successive calls to hashCode() on the same object potentially returned different values, if the proxy state had changed such that it was utilizing a different underlying connection. (Bug #48442)

The batch rewrite functionality attempted to identify the start of the VALUES list by looking for “VALUES ” (with trailing space). However, valid MySQL syntax permits VALUES to be followed by whitespace or an opening parenthesis:

INSERT INTO tbl VALUES
(1);

INSERT INTO tbl VALUES(1);

Queries written with the above formats did not therefore gain the performance benefits of the batch rewrite. (Bug #48172)

A PermGen memory leaked was caused by the Connector/J statement cancellation timer (java.util.Timer). When the application was unloaded the cancellation timer did not terminate, preventing the ClassLoader from being garbage collected. (Bug #36565)

With the connection string option noDatetimeStringSync set to true, and server-side prepared statements enabled, the following exception was generated if an attempt was made to obtain, using ResultSet.getString(), a datetime value containing all zero components:

java.sql.SQLException: Value '0000-00-00' can not be represented as java.sql.Date

(Bug #32525)

Changes in MySQL Connector/J 5.1.10 (2009-09-23)

Fixes bugs found since release 5.1.9.

Bugs Fixed

The DriverManager.getConnection() method ignored a non-standard port if it was specified in the JDBC connection string. Connector/J always used the standard port 3306 for connection creation. For example, if the string was jdbc:mysql://localhost:6777, Connector/J would attempt to connect to port 3306, rather than 6777. (Bug #47494)

Changes in MySQL Connector/J 5.1.9 (2009-09-21)

Bugs Fixed

In the class com.mysql.jdbc.jdbc2.optional.SuspendableXAConnection, which is used when pinGlobalTxToPhysicalConnection=true, there is a static map (XIDS_TO_PHYSICAL_CONNECTIONS) that tracks the Xid with the XAConnection, however this map was not populated. The effect was that the SuspendableXAConnection was never pinned to the real XA connection. Instead it created new connections on calls to start, end, resume, and prepare. (Bug #46925)

When using the ON DUPLICATE KEY UPDATE functionality together with the rewriteBatchedStatements option set to true, an exception was generated when trying to execute the prepared statement:

INSERT INTO config_table (modified,id_) VALUES (?,?) ON DUPLICATE KEY UPDATE modified=?

The exception generated was:

java.sql.SQLException: Parameter index out of range (3 > number of parameters, which is
2).
  at com.sag.etl.job.processors.JdbcInsertProcessor.flush(JdbcInsertProcessor.java:135)
......
Caused by: java.sql.SQLException: Parameter index out of range (3 > number of parameters,
which is 2).
  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
  at com.mysql.jdbc.PreparedStatement.checkBounds(PreparedStatement.java:3657)
  at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3641)
  at
com.mysql.jdbc.PreparedStatement.setBytesNoEscapeNoQuotes(PreparedStatement.java:3391)
  at
com.mysql.jdbc.PreparedStatement.setOneBatchedParameterSet(PreparedStatement.java:4203)
  at com.mysql.jdbc.PreparedStatement.executeBatchedInserts(PreparedStatement.java:1759)
  at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1441)
  at com.sag.etl.job.processors.JdbcInsertProcessor.flush(JdbcInsertProcessor.java:131)
  ... 16 more

(Bug #46788)

When Connector/J encountered an error condition that caused it to create a CommunicationsException, it tried to build a friendly error message that helped diagnose what was wrong. However, if there had been no network packets received from the server, the error message contained the following incorrect text:

The last packet successfully received from the server was 1,249,932,468,916 milliseconds
ago.  The last packet sent successfully to the server was 0 milliseconds ago.

(Bug #46637)

The getSuperTypes method returned a result set with incorrect names for the first two columns. The name of the first column in the result set was expected to be TYPE_CAT and that of the second column TYPE_SCHEM. The method however returned the names as TABLE_CAT and TABLE_SCHEM for first and second column respectively. (Bug #44508)

SQLException for data truncation error gave the error code as 0 instead of 1265. (Bug #44324)

Calling ResultSet.deleteRow() on a table with a primary key of type BINARY(8) silently failed to delete the row, but only in some repeatable cases. The generated DELETE statement generated corrupted part of the primary key data. Specifically, one of the bytes was changed from 0x90 to 0x9D, although the corruption appeared to be different depending on whether the application was run on Windows or Linux. (Bug #43759)

Accessing result set columns by name after the result set had been closed resulted in a NullPointerException instead of a SQLException. (Bug #41484)

QueryTimeout did not work for batch statements waiting on a locked table.

When a batch statement was issued to the server and was forced to wait because of a locked table, Connector/J only terminated the first statement in the batch when the timeout was exceeded, leaving the rest hanging. (Bug #34555)

The parseURL method in class com.mysql.jdbc.Driver did not work as expected. When given a URL such as “jdbc:mysql://www.mysql.com:12345/my_database” to parse, the property PORT_PROPERTY_KEY was found to be null and the HOST_PROPERTY_KEY property was found to be “www.mysql.com:12345”.

Note

Connector/J has been fixed so that it will now always fill in the PORT property (using 3306 if not specified), and the HOST property (using localhost if not specified) when parseURL() is called. The driver also parses a list of hosts into HOST.n and PORT.n properties as well as adding a property NUM_HOSTS for the number of hosts it has found. If a list of hosts is passed to the driver, HOST and PORT will be set to the values given by HOST.1 and PORT.1 respectively. This change has centralized and cleaned up a large section of code used to generate lists of hosts, both for load-balanced and fault tolerant connections and their tests.

(Bug #32216)

Attempting to delete rows using ResultSet.deleteRow() did not delete rows correctly. (Bug #27431)

The setDate method silently ignored the Calendar parameter. The code was implemented as follows:

public void setDate(int parameterIndex, java.sql.Date x, Calendar cal) throws SQLException {
   setDate(parameterIndex, x);
}

From reviewing the code it was apparent that the Calendar parameter cal was ignored. (Bug #23584)

Changes in MySQL Connector/J 5.1.8 (2009-07-16)

Bugs Fixed

The reported milliseconds since the last server packets were received/sent was incorrect by a factor of 1000. For example, the following method call:

SQLError.createLinkFailureMessageBasedOnHeuristics(
(ConnectionImpl) this.conn,
System.currentTimeMillis() - 1000,
System.currentTimeMillis() - 2000,
e,
false);

returned the following string:

The last packet successfully received from the server
was 2 milliseconds ago. The last packet sent successfully to the
server was 1 milliseconds ago.

(Bug #45419)

Calling Connection.serverPreparedStatement() variants that do not take result set type or concurrency arguments returned statements that produced result sets with incorrect defaults, namely TYPE_SCROLL_SENSITIVE. (Bug #45171)

The result set returned by getIndexInfo() did not have the format defined in the JDBC API specifications. The fourth column, DATA_TYPE, of the result set should be of type BOOLEAN. Connector/J however returns CHAR. (Bug #44869)

The result set returned by getTypeInfo() did not have the format defined in the JDBC API specifications. The second column, DATA_TYPE, of the result set should be of type INTEGER. Connector/J however returns SMALLINT. (Bug #44868)

The DEFERRABILITY column in database metadata result sets was expected to be of type SHORT. However, Connector/J returned it as INTEGER.

This affected the following methods: getImportedKeys(), getExportedKeys(), getCrossReference(). (Bug #44867)

The result set returned by getColumns() did not have the format defined in the JDBC API specifications. The fifth column, DATA_TYPE, of the result set should be of type INTEGER. Connector/J however returns SMALLINT. (Bug #44865)

The result set returned by getVersionColumns() did not have the format defined in the JDBC API specifications. The third column, DATA_TYPE, of the result set should be of type INTEGER. Connector/J however returns SMALLINT. (Bug #44863)

The result set returned by getBestRowIdentifier() did not have the format defined in the JDBC API specifications. The third column, DATA_TYPE, of the result set should be of type INTEGER. Connector/J however returns SMALLINT. (Bug #44862)

Connector/J contains logic to generate a message text specifically for streaming result sets when there are CommunicationsException exceptions generated. However, this code was never reached.

In the CommunicationsException code:

private boolean streamingResultSetInPlay = false;

public CommunicationsException(ConnectionImpl conn, long lastPacketSentTimeMs,
long lastPacketReceivedTimeMs, Exception underlyingException) {

this.exceptionMessage = SQLError.createLinkFailureMessageBasedOnHeuristics(conn,
      lastPacketSentTimeMs, lastPacketReceivedTimeMs, underlyingException,
      this.streamingResultSetInPlay);

streamingResultSetInPlay was always false, which in the following code in SQLError.createLinkFailureMessageBasedOnHeuristics() never being executed:

if (streamingResultSetInPlay) {
    exceptionMessageBuf.append(
    Messages.getString("CommunicationsException.ClientWasStreaming")); //$NON-NLS-1$
} else {
...

(Bug #44588)

The SQLError.createLinkFailureMessageBasedOnHeuristics() method created a message text for communication link failures. When certain conditions were met, this message included both “last packet sent” and “last packet received” information, but when those conditions were not met, only “last packet sent” information was provided.

Information about when the last packet was successfully received should be provided in all cases. (Bug #44587)

Statement.getGeneratedKeys() retained result set instances until the statement was closed. This caused memory leaks for long-lived statements, or statements used in tight loops. (Bug #44056)

Using useInformationSchema with DatabaseMetaData.getExportedKeys() generated the following exception:

com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Column
'REFERENCED_TABLE_NAME' in where clause is ambiguous
...
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1772)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1923)
at
com.mysql.jdbc.DatabaseMetaDataUsingInfoSchema.executeMetadataQuery(
DatabaseMetaDataUsingInfoSchema.java:50)
at
com.mysql.jdbc.DatabaseMetaDataUsingInfoSchema.getExportedKeys(
DatabaseMetaDataUsingInfoSchema.java:603)

(Bug #43714)

LoadBalancingConnectionProxy.doPing() did not have blacklist awareness.

LoadBalancingConnectionProxy implemented doPing() to ping all underlying connections, but it threw any exceptions it encountered during this process.

With the global blacklist enabled, it catches these exceptions, adds the host to the global blacklist, and only throws an exception if all hosts are down. (Bug #43421)

The method Statement.getGeneratedKeys() did not return values for UNSIGNED BIGINTS with values greater than Long.MAX_VALUE.

Unfortunately, because the server does not tell clients what TYPE the auto increment value is, the driver cannot consistently return BigIntegers for the result set returned from getGeneratedKeys(), it will only return them if the value is greater than Long.MAX_VALUE. If your application needs this consistency, it will need to check the class of the return value from .getObject() on the ResultSet returned by Statement.getGeneratedKeys() and if it is not a BigInteger, create one based on the java.lang.Long that is returned. (Bug #43196)

When the MySQL Server was upgraded from 4.0 to 5.0, the Connector/J application then failed to connect to the server. This was because authentication failed when the application ran from EBCDIC platforms such as z/OS. (Bug #43071)

When connecting with traceProtocol=true, no trace data was generated for the server greeting or login request. (Bug #43070)

Connector/J generated an unhandled StringIndexOutOfBoundsException:

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1938)
at com.mysql.jdbc.EscapeProcessor.processTimeToken(EscapeProcessor.java:353)
at com.mysql.jdbc.EscapeProcessor.escapeSQL(EscapeProcessor.java:257)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1546)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1524)

(Bug #42253)

A ConcurrentModificationException was generated in LoadBalancingConnectionProxy:

java.util.ConcurrentModificationException
 at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
 at java.util.HashMap$KeyIterator.next(Unknown Source)
 at
com.mysql.jdbc.LoadBalancingConnectionProxy.getGlobalBlacklist(LoadBalancingConnectionProxy.java:520)
 at com.mysql.jdbc.RandomBalanceStrategy.pickConnection(RandomBalanceStrategy.java:55)
 at
com.mysql.jdbc.LoadBalancingConnectionProxy.pickNewConnection(LoadBalancingConnectionProxy.java:414)
 at
com.mysql.jdbc.LoadBalancingConnectionProxy.invoke(LoadBalancingConnectionProxy.java:390)

(Bug #42055)

SQL injection was possible when using a string containing U+00A5 in a client-side prepared statement, and the character set being used was SJIS/Windows-31J. (Bug #41730)

If there was an apostrophe in a comment in a statement that was being sent through Connector/J, the apostrophe was still recognized as a quote and put the state machine in EscapeTokenizer into the inQuotes state. This led to further parse errors.

For example, consider the following statement:

String sql = "-- Customer's zip code will be fixed\n" +
  "update address set zip_code = 99999\n" +
  "where not regexp '^[0-9]{5}([[.-.]])?([0-9]{4})?$'";

When passed through Connector/J, the EscapeTokenizer did not recognize that the first apostrophe was in a comment and thus set inQuotes to true. When that happened, the quote count was incorrect and thus the regular expression did not appear to be in quotation marks. With the parser not detecting that the regular expression was in quotation marks, the curly braces were recognized as escape sequences and were removed from the regular expression, breaking it. The server thus received SQL such as:

-- Customer's zip code will be fixed
update address set zip_code = '99999'
where not regexp '^[0-9]([[.-.]])?([0-9])?$'

(Bug #41566)

MySQL Connector/J 5.1.7 was slower than previous versions when the rewriteBatchedStatements option was set to true.

Note

The performance regression in indexOfIgnoreCaseRespectMarker()has been fixed. It has also been made possible for the driver to rewrite INSERT statements with ON DUPLICATE KEY UPDATE clauses in them, as long as the UPDATE clause contains no reference to LAST_INSERT_ID(), as that would cause the driver to return bogus values for getGeneratedKeys() invocations. This has resulted in improved performance over version 5.1.7.

(Bug #41532)

When accessing a result set column by name using ResultSetImpl.findColumn() an exception was generated:

java.lang.NullPointerException
at com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1103)
at com.mysql.jdbc.ResultSetImpl.getShort(ResultSetImpl.java:5415)
at org.apache.commons.dbcp.DelegatingResultSet.getShort(DelegatingResultSet.java:219)
at com.zimbra.cs.db.DbVolume.constructVolume(DbVolume.java:297)
at com.zimbra.cs.db.DbVolume.get(DbVolume.java:197)
at com.zimbra.cs.db.DbVolume.create(DbVolume.java:95)
at com.zimbra.cs.store.Volume.create(Volume.java:227)
at com.zimbra.cs.store.Volume.create(Volume.java:189)
at com.zimbra.cs.service.admin.CreateVolume.handle(CreateVolume.java:48)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:428)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:285)

(Bug #41484)

The RETURN_GENERATED_KEYS flag was being ignored. For example, in the following code the RETURN_GENERATED_KEYS flag was ignored:

PreparedStatement ps = connection.prepareStatement("INSERT INTO table
  values(?,?)",PreparedStatement.RETURN_GENERATED_KEYS);

(Bug #41448)

When using Connector/J 5.1.7 to connect to MySQL Server 4.1.18 the following error message was generated:

Thu Dec 11 17:38:21 PST 2008 WARN: Invalid value {1} for server variable named {0},
falling back to sane default of {2}

This occurred with MySQL Server version that did not support auto_increment_increment. The error message should not have been generated. (Bug #41416)

When DatabaseMetaData.getProcedureColumns() was called, the value for LENGTH was always returned as 65535, regardless of the column type (fixed or variable) or the actual length of the column.

However, if you obtained the PRECISION value, this was correct for both fixed and variable length columns. (Bug #41269)

PreparedStatement.addBatch() did not check for all parameters being set, which led to inconsistent behavior in executeBatch(), especially when rewriting batched statements into multi-value INSERTs. (Bug #41161)

Error message strings contained variable values that were not expanded. For example:

Mon Nov 17 11:43:18 JST 2008 WARN: Invalid value {1} for server variable named {0},
falling back to sane default of {2}

(Bug #40772)

When using rewriteBatchedStatements=true with:

INSERT INTO table_name_values (...) VALUES (...)

Query rewriting failed because “values” at the end of the table name was mistaken for the reserved keyword. The error generated was as follows:

testBug40439(testsuite.simple.TestBug40439)java.sql.BatchUpdateException: You have an
error in your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near 'values (2,'toto',2),(id,data, ordr) values
(3,'toto',3),(id,data, ordr) values (' at line 1
at com.mysql.jdbc.PreparedStatement.executeBatchedInserts(PreparedStatement.java:1495)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1097)
at testsuite.simple.TestBug40439.testBug40439(TestBug40439.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at testsuite.simple.TestBug40439.main(TestBug40439.java:57)

(Bug #40439)

A statement interceptor received the incorrect parameters when used with a batched statement. (Bug #39426)

Using Connector/J 5.1.6 the method ResultSet.getObject returned a BYTE[] for following:

SELECT TRIM(rowid) FROM tbl

Where rowid had a type of INT(11) PRIMARY KEY AUTO_INCREMENT.

The expected return type was one of CHAR, VARCHAR, CLOB, however, a BYTE[] was returned.

Further, adding functionsNeverReturnBlobs=true to the connection string did not have any effect on the return type. (Bug #38387)

Changes in MySQL Connector/J 5.1.7 (2008-10-21)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

When statements include ON DUPLICATE UPDATE, and rewriteBatchedStatements is set to true, batched statements are not rewritten into the form INSERT INTO table VALUES (), (), (), instead the statements are executed sequentially.

Bugs Fixed

When an application using Connector/J ran into an error, the SQLException.getMessage() method was returning null instead of an error description. This has been fixed by calling the setRowPositionValidity() method in the ResultSetImpl constructor. (Bug #11749413, Bug #38943)

When using trustCertificateKeyStoreUrl or clientCertificateKeyStoreUrl, an IllegalStateException was caused by an uninitialized TrustManagerFactoryImpl object. (Bug #11748637, Bug #36948, Bug #38192)

Statement.getGeneratedKeys() returned two keys when using ON DUPLICATE KEY UPDATE and the row was updated, not inserted. (Bug #42309)

When using the replication driver with autoReconnect=true, Connector/J checks in PreparedStatement.execute (also called by CallableStatement.execute) to determine if the first character of the statement is an “S”, in an attempt to block all statements that are not read-only-safe, for example non-SELECT statements. However, this also blocked CALLs to stored procedures, even if the stored procedures were defined as SQL READ DATA or NO SQL. (Bug #40031)

With large result sets ResultSet.findColumn became a performance bottleneck. (Bug #39962)

Connector/J ignored the value of the MySQL Server variable auto_increment_increment. (Bug #39956)

Connector/J failed to parse TIMESTAMP strings for nanos correctly. (Bug #39911)

When the LoadBalancingConnectionProxy handles a SQLException with SQL state starting with “08”, it calls invalidateCurrentConnection, which in turn removes that Connection from liveConnections and the connectionsToHostsMap, but it did not add the host to the new global blacklist, if the global blacklist was enabled.

There was also the possibility of a NullPointerException when trying to update stats, where connectionsToHostsMap.get(this.currentConn) was called:

int hostIndex = ((Integer) this.hostsToListIndexMap.get(this.connectionsToHostsMap.get(this.currentConn))).intValue();

This could happen if a client tried to issue a rollback after catching a SQLException caused by a connection failure. (Bug #39784)

When configuring the Java Replication Driver the last slave specified was never used. (Bug #39611)

When an INSERT ON DUPLICATE KEY UPDATE was performed, and the key already existed, the affected-rows value was returned as 1 instead of 0. (Bug #39352)

When using loadbalancing, Connector/J might not cycle through the whole list of configured hosts in its attempt to make a connection. This fix corrects the implementation of the configuration parameter retriesAllDown, making sure that Connector/J cycles through the whole list of hosts for each of its attempt to connect. (Bug #38785, Bug #11749331)

When using the random load balancing strategy and starting with two servers that were both unavailable, an IndexOutOfBoundsException was generated when removing a server from the whiteList. (Bug #38782)

Connector/J threw the following exception when using a read-only connection:

java.sql.SQLException: Connection is read-only. Queries leading to data
modification are not allowed.

(Bug #38747)

Connector/J was unable to connect when using a non-latin1 password. (Bug #37570)

The useOldAliasMetadataBehavior connection property was ignored. (Bug #35753)

Incorrect result is returned from isAfterLast() in streaming ResultSet when using setFetchSize(Integer.MIN_VALUE). (Bug #35170)

When getGeneratedKeys() was called on a statement that had not been created with RETURN_GENERATED_KEYS, no exception was thrown, and batched executions then returned erroneous values. (Bug #34185)

The loadBalance bestResponseTime blacklists did not have a global state. (Bug #33861)

Changes in MySQL Connector/J 5.1.6 (2008-03-07)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Multiple result sets were not supported when using streaming mode to return data. Both normal statements and the result sets from stored procedures now return multiple results sets, with the exception of result sets using registered OUTPUT parameters. (Bug #33678)

XAConnections and datasources have been updated to the JDBC-4.0 standard.

The profiler event handling has been made extensible using the profilerEventHandler connection property.

Add the verifyServerCertificate property. If set to "false" the driver will not verify the server's certificate when useSSL is set to "true"

When using this feature, the keystore parameters should be specified by the clientCertificateKeyStore* properties, rather than system properties, as the JSSE doesn't it straightforward to have a nonverifying trust store and the "default" key store.

Bugs Fixed

When nullCatalogMeansCurrent was set to false, calls to getColumns() with null catalog and schema returned all tables in all catalogs, instead of all columns from every matching table from any database. (Bug #11747185, Bug #31187)

Compiling in Eclipse could produce a compilation warning for line 814 in the filecom.mysql.jdbc.DatabaseMetaData.java. (Bug #11746221, Bug #24595)

DatabaseMetaData.getColumns() returns incorrect COLUMN_SIZE value for SET column. (Bug #36830)

When trying to read Time values like “00:00:00” with ResultSet.getTime(int) an exception is thrown. (Bug #36051)

JDBC connection URL parameters is ignored when using MysqlConnectionPoolDataSource. (Bug #35810)

When useServerPrepStmts=true and slow query logging is enabled, the connector throws a NullPointerException when it encounters a slow query. (Bug #35666)

When using the keyword “loadbalance” in the connection string and trying to perform load balancing between two databases, the driver appears to hang. (Bug #35660)

JDBC data type getter method was changed to accept only column name, whereas previously it accepted column label. (Bug #35610)

Prepared statements from pooled connections caused a NullPointerException when closed() under JDBC-4.0. (Bug #35489)

In calling a stored function returning a bigint, an exception is encountered beginning:

java.sql.SQLException: java.lang.NumberFormatException: For input string:

followed by the text of the stored function starting after the argument list. (Bug #35199)

The JDBC driver uses a different method for evaluating column names in resultsetmetadata.getColumnName() and when looking for a column in resultset.getObject(columnName). This causes Hibernate to fail in queries where the two methods yield different results, for example in queries that use alias names:

SELECT column AS aliasName from table

(Bug #35150)

MysqlConnectionPoolDataSource does not support ReplicationConnection. Notice that we implemented com.mysql.jdbc.Connection for ReplicationConnection, however, only accessors from ConnectionProperties are implemented (not the mutators), and they return values from the currently active connection. All other methods from com.mysql.jdbc.Connection are implemented, and operate on the currently active connection, with the exception of resetServerState() and changeUser(). (Bug #34937)

ResultSet.getTimestamp() returns incorrect values for month/day of TIMESTAMPs when using server-side prepared statements (not enabled by default). (Bug #34913)

RowDataStatic doesn't always set the metadata in ResultSetRow, which can lead to failures when unpacking DATE, TIME, DATETIME and TIMESTAMP types when using absolute, relative, and previous result set navigation methods. (Bug #34762)

When calling isValid() on an active connection, if the timeout is nonzero then the Connection is invalidated even if the Connection is valid. (Bug #34703)

It was not possible to truncate a BLOB using Blog.truncate() when using 0 as an argument. (Bug #34677)

When using a cursor fetch for a statement, the internal prepared statement could cause a memory leak until the connection was closed. The internal prepared statement is now deleted when the corresponding result set is closed. (Bug #34518)

When retrieving the column type name of a geometry field, the driver would return UNKNOWN instead of GEOMETRY. (Bug #34194)

Statements with batched values do not return correct values for getGeneratedKeys() when rewriteBatchedStatements is set to true, and the statement has an ON DUPLICATE KEY UPDATE clause. (Bug #34093)

The internal class ResultSetInternalMethods referenced the nonpublic class com.mysql.jdbc.CachedResultSetMetaData. (Bug #33823)

A NullPointerException could be raised when using client-side prepared statements and enabled the prepared statement cache using the cachePrepStmts. (Bug #33734)

Using server side cursors and cursor fetch, the table metadata information would return the data type name instead of the column name. (Bug #33594)

ResultSet.getTimestamp() would throw a NullPointerException instead of a SQLException when called on an empty ResultSet. (Bug #33162)

Load balancing connection using best response time would incorrectly "stick" to hosts that were down when the connection was first created.

We solve this problem with a black list that is used during the picking of new hosts. If the black list ends up including all configured hosts, the driver will retry for a configurable number of times (the retriesAllDown configuration property, with a default of 120 times), sleeping 250ms between attempts to pick a new connection.

We've also went ahead and made the balancing strategy extensible. To create a new strategy, implement the interface com.mysql.jdbc.BalanceStrategy (which also includes our standard "extension" interface), and tell the driver to use it by passing in the class name using the loadBalanceStrategy configuration property. (Bug #32877)

During a Daylight Savings Time (DST) switchover, there was no way to store two timestamp/datetime values , as the hours end up being the same when sent as the literal that MySQL requires.

Note that to get this scenario to work with MySQL (since it doesn't support per-value timezones), you need to configure your server (or session) to be in UTC, and tell the driver not to use the legacy date/time code by setting useLegacyDatetimeCode to "false". This will cause the driver to always convert to/from the server and client timezone consistently.

This bug fix also fixes Bug #15604, by adding entirely new date/time handling code that can be switched on by useLegacyDatetimeCode being set to "false" as a JDBC configuration property. For Connector/J 5.1.x, the default is "true", in trunk and beyond it will be "false" (that is, the old date/time handling code will be deprecated) (Bug #32577, Bug #15604)

When unpacking rows directly, we don't hand off error message packets to the internal method which decodes them correctly, so no exception is raised, and the driver than hangs trying to read rows that aren't there. This tends to happen when calling stored procedures, as normal SELECTs won't have an error in this spot in the protocol unless an I/O error occurs. (Bug #32246)

When using a connection from ConnectionPoolDataSource, some Connection.prepareStatement() methods would return null instead of the prepared statement. (Bug #32101)

Using CallableStatement.setNull() on a stored function would throw an ArrayIndexOutOfBounds exception when setting the last parameter to null. (Bug #31823)

MysqlValidConnectionChecker doesn't properly handle connections created using ReplicationConnection. (Bug #31790)

Retrieving the server version information for an active connection could return invalid information if the default character encoding on the host was not ASCII compatible. (Bug #31192)

Further fixes have been made to this bug in the event that a node is nonresponsive. Connector/J will now try a different random node instead of waiting for the node to recover before continuing. (Bug #31053)

ResultSet returned by Statement.getGeneratedKeys() is not closed automatically when statement that created it is closed. (Bug #30508)

DatabaseMetadata.getColumns() doesn't return the correct column names if the connection character isn't UTF-8. A bug in MySQL server compounded the issue, but was fixed within the MySQL 5.0 release cycle. The fix includes changes to all the sections of the code that access the server metadata. (Bug #20491)

Fixed ResultSetMetadata.getColumnName() for result sets returned from Statement.getGeneratedKeys() - it was returning null instead of "GENERATED_KEY" as in 5.0.x.

Changes in MySQL Connector/J 5.1.5 (2007-10-09)

New Features, Compared to the 5.0 Series of Connector/J

Functionality Added or Changed

Bugs Fixed

New Features, Compared to the 5.0 Series of Connector/J

Support for JDBC-4.0 NCHAR, NVARCHAR and NCLOB types.

JDBC-4.0 support for setting per-connection client information (which can be viewed in the comments section of a query using SHOW PROCESSLIST on a MySQL server, or can be extended to support custom persistence of the information using a public interface).

Support for JDBC-4.0 XML processing using JAXP interfaces to DOM, SAX and StAX.

JDBC-4.0 standardized unwrapping to interfaces that include vendor extensions.

Functionality Added or Changed

Added autoSlowLog configuration property, overrides slowQueryThreshold* properties, driver determines slow queries by those that are slower than 5 * stddev of the mean query time (outside the 96% percentile).

Bugs Fixed

When a connection is in read-only mode, queries that are wrapped in parentheses were incorrectly identified DML statements. (Bug #28256)

When calling setTimestamp on a prepared statement, the timezone information stored in the calendar object was ignored. This resulted in the incorrect DATETIME information being stored. The following example illustrates this:

Timestamp t = new Timestamp( cal.getTimeInMillis() );
ps.setTimestamp( N, t, cal );

(Bug #15604)

Changes in MySQL Connector/J 5.1.4 (Not Released)

Only released internally.

Version 5.1.4 has no changelog entries, or they have not yet been published because the product version has not yet been released.

Changes in MySQL Connector/J 5.1.3 (2007-09-10)

New Features, Compared to the 5.0 Series of Connector/J

Functionality Added or Changed

Bugs Fixed

New Features, Compared to the 5.0 Series of Connector/J

Support for JDBC-4.0 NCHAR, NVARCHAR and NCLOB types.

JDBC-4.0 support for setting per-connection client information (which can be viewed in the comments section of a query using SHOW PROCESSLIST on a MySQL server, or can be extended to support custom persistence of the information using a public interface).

Support for JDBC-4.0 XML processing using JAXP interfaces to DOM, SAX and StAX.

JDBC-4.0 standardized unwrapping to interfaces that include vendor extensions.

Functionality Added or Changed

Connector/J now connects using an initial character set of utf-8 solely for the purpose of authentication to permit user names or database names in any character set to be used in the JDBC connection URL. (Bug #29853)

Added two configuration parameters:

blobsAreStrings: Should the driver always treat BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

functionsNeverReturnBlobs: Should the driver always treat data from functions returning BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

Setting rewriteBatchedStatements to true now causes CallableStatements with batched arguments to be re-written in the form "CALL (...); CALL (...); ..." to send the batch in as few client/server round trips as possible.

The driver now picks appropriate internal row representation (whole row in one buffer, or individual byte[]s for each column value) depending on heuristics, including whether or not the row has BLOB or TEXT types and the overall row-size. The threshold for row size that will cause the driver to use a buffer rather than individual byte[]s is configured by the configuration property largeRowSizeThreshold, which has a default value of 2KB.

The data (and how it is stored) for ResultSet rows are now behind an interface which enables us (in some cases) to allocate less memory per row, in that for "streaming" result sets, we re-use the packet used to read rows, since only one row at a time is ever active.

Added experimental support for statement "interceptors" through the com.mysql.jdbc.StatementInterceptor interface, examples are in com/mysql/jdbc/interceptors. Implement this interface to be placed "in between" query execution, so that it can be influenced (currently experimental).

The driver will automatically adjust the server session variable net_write_timeout when it determines its been asked for a "streaming" result, and resets it to the previous value when the result set has been consumed. (The configuration property is named netTimeoutForStreamingResults, with a unit of seconds, the value '0' means the driver will not try and adjust this value).

JDBC-4.0 ease-of-development features including auto-registration with the DriverManager through the service provider mechanism, standardized Connection validity checks and categorized SQLExceptions based on recoverability/retry-ability and class of the underlying error.

Statement.setQueryTimeout()s now affect the entire batch for batched statements, rather than the individual statements that make up the batch.

Errors encountered during Statement/PreparedStatement/CallableStatement.executeBatch() when rewriteBatchStatements has been set to true now return BatchUpdateExceptions according to the setting of continueBatchOnError.

If continueBatchOnError is set to true, the update counts for the "chunk" that were sent as one unit will all be set to EXECUTE_FAILED, but the driver will attempt to process the remainder of the batch. You can determine which "chunk" failed by looking at the update counts returned in the BatchUpdateException.

If continueBatchOnError is set to "false", the update counts returned will contain all updates up-to and including the failed "chunk", with all counts for the failed "chunk" set to EXECUTE_FAILED.

Since MySQL doesn't return multiple error codes for multiple-statements, or for multi-value INSERT/REPLACE, it is the application's responsibility to handle determining which item(s) in the "chunk" actually failed.

New methods on com.mysql.jdbc.Statement: setLocalInfileInputStream() and getLocalInfileInputStream():

setLocalInfileInputStream() sets an InputStream instance that will be used to send data to the MySQL server for a LOAD DATA LOCAL INFILE statement rather than a FileInputStream or URLInputStream that represents the path given as an argument to the statement.

This stream will be read to completion upon execution of a LOAD DATA LOCAL INFILE statement, and will automatically be closed by the driver, so it needs to be reset before each call to execute*() that would cause the MySQL server to request data to fulfill the request for LOAD DATA LOCAL INFILE.

If this value is set to NULL, the driver will revert to using a FileInputStream or URLInputStream as required.

getLocalInfileInputStream() returns the InputStream instance that will be used to send data in response to a LOAD DATA LOCAL INFILE statement.

This method returns NULL if no such stream has been set using setLocalInfileInputStream().

Setting useBlobToStoreUTF8OutsideBMP to true tells the driver to treat [MEDIUM/LONG]BLOB columns as [LONG]VARCHAR columns holding text encoded in UTF-8 that has characters outside the BMP (4-byte encodings), which MySQL server can't handle natively.

Set utf8OutsideBmpExcludedColumnNamePattern to a regex so that column names matching the given regex will still be treated as BLOBs The regex must follow the patterns used for the java.util.regexpackage. The default is to exclude no columns, and include all columns.

Set utf8OutsideBmpIncludedColumnNamePattern to specify exclusion rules to utf8OutsideBmpExcludedColumnNamePattern". The regex must follow the patterns used for the java.util.regex package.

Bugs Fixed

setObject(int, Object, int, int) delegate in PreparedStatementWrapper delegates to wrong method. (Bug #30892)

NPE with null column values when padCharsWithSpace is set to true. (Bug #30851)

Collation on VARBINARY column types would be misidentified. A fix has been added, but this fix only works for MySQL server versions 5.0.25 and newer, since earlier versions didn't consistently return correct metadata for functions, and thus results from subqueries and functions were indistinguishable from each other, leading to type-related bugs. (Bug #30664)

An ArithmeticException or NullPointerException would be raised when the batch had zero members and rewriteBatchedStatements=true when addBatch() was never called, or executeBatch() was called immediately after clearBatch(). (Bug #30550)

Closing a load-balanced connection would cause a ClassCastException. (Bug #29852)

Connection checker for JBoss didn't use same method parameters using reflection, causing connections to always seem "bad". (Bug #29106)

DatabaseMetaData.getTypeInfo() for the types DECIMAL and NUMERIC will return a precision of 254 for server versions older than 5.0.3, 64 for versions 5.0.3 to 5.0.5 and 65 for versions newer than 5.0.5. (Bug #28972)

CallableStatement.executeBatch() doesn't work when connection property noAccessToProcedureBodies has been set to true.

The fix involves changing the behavior of noAccessToProcedureBodies,in that the driver will now report all parameters as IN parameters but permit callers to call registerOutParameter() on them without throwing an exception. (Bug #28689)

DatabaseMetaData.getColumns() doesn't contain SCOPE_* or IS_AUTOINCREMENT columns. (Bug #27915)

Schema objects with identifiers other than the connection character aren't retrieved correctly in ResultSetMetadata. (Bug #27867)

Connection.getServerCharacterEncoding() doesn't work for servers with version >= 4.1. (Bug #27182)

The automated SVN revisions in DBMD.getDriverVersion(). The SVN revision of the directory is now inserted into the version information during the build. (Bug #21116)

Specifying a "validation query" in your connection pool that starts with "/* ping */" _exactly_ will cause the driver to instead send a ping to the server and return a fake result set (much lighter weight), and when using a ReplicationConnection or a LoadBalancedConnection, will send the ping across all active connections.

Changes in MySQL Connector/J 5.1.2 (2007-06-29)

This is a new Beta development release, fixing recently discovered bugs.

Functionality Added or Changed

Setting the configuration property rewriteBatchedStatements to true will now cause the driver to rewrite batched prepared statements with more than 3 parameter sets in a batch into multi-statements (separated by ";") if they are not plain (that is, without SELECT or ON DUPLICATE KEY UPDATE clauses) INSERT or REPLACE statements.

Changes in MySQL Connector/J 5.1.1 (2007-06-22)

This is a new Alpha development release, adding new features and fixing recently discovered bugs.

Functionality Added or Changed

Incompatible Change: Pulled vendor-extension methods of Connection implementation out into an interface to support java.sql.Wrapper functionality from ConnectionPoolDataSource. The vendor extensions are javadoc'd in the com.mysql.jdbc.Connection interface.

For those looking further into the driver implementation, it is not an API that is used for pluggability of implementations inside our driver (which is why there are still references to ConnectionImpl throughout the code).

We've also added server and client prepareStatement() methods that cover all of the variants in the JDBC API.

Connection.serverPrepare(String) has been re-named to Connection.serverPrepareStatement() for consistency with Connection.clientPrepareStatement().

Row navigation now causes any streams/readers open on the result set to be closed, as in some cases we're reading directly from a shared network packet and it will be overwritten by the "next" row.

Made it possible to retrieve prepared statement parameter bindings (to be used in StatementInterceptors, primarily).

Externalized the descriptions of connection properties.

The data (and how it is stored) for ResultSet rows are now behind an interface which enables us (in some cases) to allocate less memory per row, in that for "streaming" result sets, we re-use the packet used to read rows, since only one row at a time is ever active.

Similar to Connection, we pulled out vendor extensions to Statement into an interface named com.mysql.Statement, and moved the Statement class into com.mysql.StatementImpl. The two methods (javadoc'd in com.mysql.Statement are enableStreamingResults(), which already existed, and disableStreamingResults() which sets the statement instance back to the fetch size and result set type it had before enableStreamingResults() was called.

Driver now picks appropriate internal row representation (whole row in one buffer, or individual byte[]s for each column value) depending on heuristics, including whether or not the row has BLOB or TEXT types and the overall row-size. The threshold for row size that will cause the driver to use a buffer rather than individual byte[]s is configured by the configuration property largeRowSizeThreshold, which has a default value of 2KB.

Added experimental support for statement "interceptors" through the com.mysql.jdbc.StatementInterceptor interface, examples are in com/mysql/jdbc/interceptors.

Implement this interface to be placed "in between" query execution, so that you can influence it. (currently experimental).

StatementInterceptors are "chainable" when configured by the user, the results returned by the "current" interceptor will be passed on to the next on in the chain, from left-to-right order, as specified by the user in the JDBC configuration property statementInterceptors.

See the sources (fully javadoc'd) for com.mysql.jdbc.StatementInterceptor for more details until we iron out the API and get it documented in the manual.

Setting rewriteBatchedStatements to true now causes CallableStatements with batched arguments to be re-written in the form CALL (...); CALL (...); ... to send the batch in as few client/server round trips as possible.

Changes in MySQL Connector/J 5.1.0 (2007-04-11)

This is the first public alpha release of the current Connector/J 5.1 development branch, providing an insight to upcoming features. Although some of these are still under development, this release includes the following new features and changes (in comparison to the current Connector/J 5.0 production release):

Important change: Due to a number of issues with the use of server-side prepared statements, Connector/J 5.0.5 has disabled their use by default. The disabling of server-side prepared statements does not affect the operation of the connector in any way.

To enable server-side prepared statements you must add the following configuration property to your connector string:

useServerPrepStmts=true

The default value of this property is false (that is, Connector/J does not use server-side prepared statements).

Note

The disabling of server-side prepared statements does not affect the operation of the connector. However, if you use the useTimezone=true connection option and use client-side prepared statements (instead of server-side prepared statements) you should also set useSSPSCompatibleTimezoneShift=true.

Functionality Added or Changed

Refactored CommunicationsException into a JDBC-3.0 version, and a JDBC-4.0 version (which extends SQLRecoverableException, now that it exists).

Note

This change means that if you were catching com.mysql.jdbc.CommunicationsException in your applications instead of looking at the SQLState class of 08, and are moving to Java 6 (or newer), you need to change your imports to that exception to be com.mysql.jdbc.exceptions.jdbc4.CommunicationsException, as the old class will not be instantiated for communications link-related errors under Java 6.

Added support for JDBC-4.0 categorized SQLExceptions.

Added support for JDBC-4.0's NCLOB, and NCHAR/NVARCHAR types.

com.mysql.jdbc.java6.javac: Full path to your Java-6 javac executable

Added support for JDBC-4.0's SQLXML interfaces.

Re-worked Ant buildfile to build JDBC-4.0 classes separately, as well as support building under Eclipse (since Eclipse can't mix/match JDKs).

To build, you must set JAVA_HOME to J2SDK-1.4.2 or Java-5, and set the following properties on your Ant command line:

com.mysql.jdbc.java6.javac: Full path to your Java-6 javac executable

com.mysql.jdbc.java6.rtjar: Full path to your Java-6 rt.jar file

New feature—driver will automatically adjust session variable net_write_timeout when it determines it has been asked for a "streaming" result, and resets it to the previous value when the result set has been consumed. (configuration property is named netTimeoutForStreamingResults value and has a unit of seconds, the value 0 means the driver will not try and adjust this value).

Added support for JDBC-4.0's client information. The backend storage of information provided using Connection.setClientInfo() and retrieved by Connection.getClientInfo() is pluggable by any class that implements the com.mysql.jdbc.JDBC4ClientInfoProvider interface and has a no-args constructor.

The implementation used by the driver is configured using the clientInfoProvider configuration property (with a default of value of com.mysql.jdbc.JDBC4CommentClientInfoProvider, an implementation which lists the client information as a comment prepended to every query sent to the server).

This functionality is only available when using Java-6 or newer.

com.mysql.jdbc.java6.rtjar: Full path to your Java-6 rt.jar file

Added support for JDBC-4.0's Wrapper interface.

Changes in MySQL Connector/J 5.0

Changes in MySQL Connector/J 5.0.8 (2007-10-09)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

blobsAreStrings: Should the driver always treat BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

Added two configuration parameters:

blobsAreStrings: Should the driver always treat BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

functionsNeverReturnBlobs: Should the driver always treat data from functions returning BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

functionsNeverReturnBlobs: Should the driver always treat data from functions returning BLOBs as Strings. Added specifically to work around dubious metadata returned by the server for GROUP BY clauses. Defaults to false.

XAConnections now start in auto-commit mode (as per JDBC-4.0 specification clarification).

Driver will now fall back to sane defaults for max_allowed_packet and net_buffer_length if the server reports them incorrectly (and will log this situation at WARN level, since it is actually an error condition).

Bugs Fixed

Connections established using URLs of the form jdbc:mysql:loadbalance:// weren't doing failover if they tried to connect to a MySQL server that was down. The driver now attempts connections to the next "best" (depending on the load balance strategy in use) server, and continues to attempt connecting to the next "best" server every 250 milliseconds until one is found that is up and running or 5 minutes has passed.

If the driver gives up, it will throw the last-received SQLException. (Bug #31053)

setObject(int, Object, int, int) delegate in PreparedStatementWrapper delegates to wrong method. (Bug #30892)

NPE with null column values when padCharsWithSpace is set to true. (Bug #30851)

Collation on VARBINARY column types would be misidentified. A fix has been added, but this fix only works for MySQL server versions 5.0.25 and newer, since earlier versions didn't consistently return correct metadata for functions, and thus results from subqueries and functions were indistinguishable from each other, leading to type-related bugs. (Bug #30664)

An ArithmeticException or NullPointerException would be raised when the batch had zero members and rewriteBatchedStatements=true when addBatch() was never called, or executeBatch() was called immediately after clearBatch(). (Bug #30550)

Closing a load-balanced connection would cause a ClassCastException. (Bug #29852)

Connection checker for JBoss didn't use same method parameters using reflection, causing connections to always seem "bad". (Bug #29106)

DatabaseMetaData.getTypeInfo() for the types DECIMAL and NUMERIC will return a precision of 254 for server versions older than 5.0.3, 64 for versions 5.0.3 to 5.0.5 and 65 for versions newer than 5.0.5. (Bug #28972)

CallableStatement.executeBatch() doesn't work when connection property noAccessToProcedureBodies has been set to true.

The fix involves changing the behavior of noAccessToProcedureBodies,in that the driver will now report all parameters as IN parameters but permit callers to call registerOutParameter() on them without throwing an exception. (Bug #28689)

When a connection is in read-only mode, queries that are wrapped in parentheses were incorrectly identified DML statements. (Bug #28256)

UNSIGNED types not reported using DBMD.getTypeInfo(), and capitalization of type names is not consistent between DBMD.getColumns(), RSMD.getColumnTypeName() and DBMD.getTypeInfo().

This fix also ensures that the precision of UNSIGNED MEDIUMINT and UNSIGNED BIGINT is reported correctly using DBMD.getColumns(). (Bug #27916)

DatabaseMetaData.getColumns() doesn't contain SCOPE_* or IS_AUTOINCREMENT columns. (Bug #27915)

Schema objects with identifiers other than the connection character aren't retrieved correctly in ResultSetMetadata. (Bug #27867)

Cached metadata with PreparedStatement.execute() throws NullPointerException. (Bug #27412)

Connection.getServerCharacterEncoding() doesn't work for servers with version >= 4.1. (Bug #27182)

The automated SVN revisions in DBMD.getDriverVersion(). The SVN revision of the directory is now inserted into the version information during the build. (Bug #21116)

Specifying a "validation query" in your connection pool that starts with "/* ping */" _exactly_ will cause the driver to instead send a ping to the server and return a fake result set (much lighter weight), and when using a ReplicationConnection or a LoadBalancedConnection, will send the ping across all active connections.

Changes in MySQL Connector/J 5.0.7 (2007-07-20)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

The driver will now automatically set useServerPrepStmts to true when useCursorFetch has been set to true, since the feature requires server-side prepared statements to function.

tcpKeepAlive - Should the driver set SO_KEEPALIVE (default true)?

Give more information in EOFExceptions thrown out of MysqlIO (how many bytes the driver expected to read, how many it actually read, say that communications with the server were unexpectedly lost).

Driver detects when it is running in a ColdFusion MX server (tested with version 7), and uses the configuration bundle coldFusion, which sets useDynamicCharsetInfo to false (see previous entry), and sets useLocalSessionState and autoReconnect to true.

tcpNoDelay - Should the driver set SO_TCP_NODELAY (disabling the Nagle Algorithm, default true)?

Added configuration property slowQueryThresholdNanos - if useNanosForElapsedTime is set to true, and this property is set to a nonzero value the driver will use this threshold (in nanosecond units) to determine if a query was slow, instead of using millisecond units.

tcpRcvBuf - Should the driver set SO_RCV_BUF to the given value? The default value of '0', means use the platform default value for this property.

Setting useDynamicCharsetInfo to false now causes driver to use static lookups for collations as well (makes ResultSetMetadata.isCaseSensitive() much more efficient, which leads to performance increase for ColdFusion, which calls this method for every column on every table it sees, it appears).

Added configuration properties to enable tuning of TCP/IP socket parameters:

tcpNoDelay - Should the driver set SO_TCP_NODELAY (disabling the Nagle Algorithm, default true)?

tcpKeepAlive - Should the driver set SO_KEEPALIVE (default true)?

tcpRcvBuf - Should the driver set SO_RCV_BUF to the given value? The default value of '0', means use the platform default value for this property.

tcpSndBuf - Should the driver set SO_SND_BUF to the given value? The default value of '0', means use the platform default value for this property.

tcpTrafficClass - Should the driver set traffic class or type-of-service fields? See the documentation for java.net.Socket.setTrafficClass() for more information.

Setting the configuration parameter useCursorFetch to true for MySQL-5.0+ enables the use of cursors that enable Connector/J to save memory by fetching result set rows in chunks (where the chunk size is set by calling setFetchSize() on a Statement or ResultSet) by using fully materialized cursors on the server.

tcpSndBuf - Should the driver set SO_SND_BUF to the given value? The default value of '0', means use the platform default value for this property.

tcpTrafficClass - Should the driver set traffic class or type-of-service fields? See the documentation for java.net.Socket.setTrafficClass() for more information.

Added new debugging functionality - Setting configuration property includeInnodbStatusInDeadlockExceptions to true will cause the driver to append the output of SHOW ENGINE INNODB STATUS to deadlock-related exceptions, which will enumerate the current locks held inside InnoDB.

Added configuration property useNanosForElapsedTime - for profiling/debugging functionality that measures elapsed time, should the driver try to use nanoseconds resolution if available (requires JDK >= 1.5)?

Note

If useNanosForElapsedTime is set to true, and this property is set to "0" (or left default), then elapsed times will still be measured in nanoseconds (if possible), but the slow query threshold will be converted from milliseconds to nanoseconds, and thus have an upper bound of approximately 2000 milliseconds (as that threshold is represented as an integer, not a long).

Bugs Fixed

Don't send any file data in response to LOAD DATA LOCAL INFILE if the feature is disabled at the client side. This is to prevent a malicious server or man-in-the-middle from asking the client for data that the client is not expecting. Thanks to Jan Kneschke for discovering the exploit and Andrey "Poohie" Hristov, Konstantin Osipov and Sergei Golubchik for discussions about implications and possible fixes. (Bug #29605)

Parser in client-side prepared statements runs to end of statement, rather than end-of-line for '#' comments. Also added support for '--' single-line comments. (Bug #28956)

Parser in client-side prepared statements eats character following '/' if it is not a multi-line comment. (Bug #28851)

PreparedStatement.getMetaData() for statements containing leading one-line comments is not returned correctly.

As part of this fix, we also overhauled detection of DML for executeQuery() and SELECTs for executeUpdate() in plain and prepared statements to be aware of the same types of comments. (Bug #28469)

Changes in MySQL Connector/J 5.0.6 (2007-05-15)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added an experimental load-balanced connection designed for use with SQL nodes in a MySQL Cluster/NDB environment (This is not for master-slave replication. For that, we suggest you look at ReplicationConnection or lbpool).

If the JDBC URL starts with jdbc:mysql:loadbalance://host-1,host-2,...host-n, the driver will create an implementation of java.sql.Connection that load balances requests across a series of MySQL JDBC connections to the given hosts, where the balancing takes place after transaction commit.

Therefore, for this to work (at all), you must use transactions, even if only reading data.

Physical connections to the given hosts will not be created until needed.

The driver will invalidate connections that it detects have had communication errors when processing a request. A new connection to the problematic host will be attempted the next time it is selected by the load balancing algorithm.

There are two choices for load balancing algorithms, which may be specified by the loadBalanceStrategy JDBC URL configuration property:

random: The driver will pick a random host for each request. This tends to work better than round-robin, as the randomness will somewhat account for spreading loads where requests vary in response time, while round-robin can sometimes lead to overloaded nodes if there are variations in response times across the workload.

bestResponseTime: The driver will route the request to the host that had the best response time for the previous transaction.

bestResponseTime: The driver will route the request to the host that had the best response time for the previous transaction.

Added configuration property padCharsWithSpace (defaults to false). If set to true, and a result set column has the CHAR type and the value does not fill the amount of characters specified in the DDL for the column, the driver will pad the remaining characters with space (for ANSI compliance).

When useLocalSessionState is set to true and connected to a MySQL-5.0 or later server, the JDBC driver will now determine whether an actual commit or rollback statement needs to be sent to the database when Connection.commit() or Connection.rollback() is called.

This is especially helpful for high-load situations with connection pools that always call Connection.rollback() on connection check-in/check-out because it avoids a round-trip to the server.

Added configuration property useDynamicCharsetInfo. If set to false (the default), the driver will use a per-connection cache of character set information queried from the server when necessary, or when set to true, use a built-in static mapping that is more efficient, but isn't aware of custom character sets or character sets implemented after the release of the JDBC driver.

Note

This only affects the padCharsWithSpace configuration property and the ResultSetMetaData.getColumnDisplayWidth() method.

New configuration property, enableQueryTimeouts (default true).

When enabled, query timeouts set with Statement.setQueryTimeout() use a shared java.util.Timer instance for scheduling. Even if the timeout doesn't expire before the query is processed, there will be memory used by the TimerTask for the given timeout which won't be reclaimed until the time the timeout would have expired if it hadn't been cancelled by the driver. High-load environments might want to consider disabling this functionality. (this configuration property is part of the maxPerformance configuration bundle).

Give better error message when "streaming" result sets, and the connection gets clobbered because of exceeding net_write_timeout on the server.

random: The driver will pick a random host for each request. This tends to work better than round-robin, as the randomness will somewhat account for spreading loads where requests vary in response time, while round-robin can sometimes lead to overloaded nodes if there are variations in response times across the workload.

com.mysql.jdbc.[NonRegistering]Driver now understands URLs of the format jdbc:mysql:replication:// and jdbc:mysql:loadbalance:// which will create a ReplicationConnection (exactly like when using [NonRegistering]ReplicationDriver) and an experimental load-balanced connection designed for use with SQL nodes in a MySQL Cluster/NDB environment, respectively.

In an effort to simplify things, we're working on deprecating multiple drivers, and instead specifying different core behavior based upon JDBC URL prefixes, so watch for [NonRegistering]ReplicationDriver to eventually disappear, to be replaced with com.mysql.jdbc[NonRegistering]Driver with the new URL prefix.

Fixed issue where a failed-over connection would let an application call setReadOnly(false), when that call should be ignored until the connection is reconnected to a writable master unless failoverReadOnly had been set to false.

Driver will now use INSERT INTO ... VALUES (DEFAULT)form of statement for updatable result sets for ResultSet.insertRow(), rather than pre-populating the insert row with values from DatabaseMetaData.getColumns()(which results in a SHOW FULL COLUMNS on the server for every result set). If an application requires access to the default values before insertRow() has been called, the JDBC URL should be configured with populateInsertRowWithDefaultValues set to true.

This fix specifically targets performance issues with ColdFusion and the fact that it seems to ask for updatable result sets no matter what the application does with them.

More intelligent initial packet sizes for the "shared" packets are used (512 bytes, rather than 16K), and initial packets used during handshake are now sized appropriately as to not require reallocation.

Bugs Fixed

More useful error messages are generated when the driver thinks a result set is not updatable. (Thanks to Ashley Martens for the patch). (Bug #28085)

Connection.getTransactionIsolation() uses "SHOW VARIABLES LIKE" which is very inefficient on MySQL-5.0+ servers. (Bug #27655)

Fixed issue where calling getGeneratedKeys() on a prepared statement after calling execute() didn't always return the generated keys (executeUpdate() worked fine however). (Bug #27655)

CALL /* ... */ some_proc() doesn't work. As a side effect of this fix, you can now use /* */ and # comments when preparing statements using client-side prepared statement emulation.

If the comments happen to contain parameter markers (?), they will be treated as belonging to the comment (that is, not recognized) rather than being a parameter of the statement.

Note

The statement when sent to the server will contain the comments as-is, they're not stripped during the process of preparing the PreparedStatement or CallableStatement.

(Bug #27400)

ResultSet.get*() with a column index < 1 returns misleading error message. (Bug #27317)

Using ResultSet.get*() with a column index less than 1 returns a misleading error message. (Bug #27317)

Comments in DDL of stored procedures/functions confuse procedure parser, and thus metadata about them can not be created, leading to inability to retrieve said metadata, or execute procedures that have certain comments in them. (Bug #26959)

Fast date/time parsing doesn't take into account 00:00:00 as a legal value. (Bug #26789)

PreparedStatement is not closed in BlobFromLocator.getBytes(). (Bug #26592)

When the configuration property useCursorFetch was set to true, sometimes server would return new, more exact metadata during the execution of the server-side prepared statement that enables this functionality, which the driver ignored (using the original metadata returned during prepare()), causing corrupt reading of data due to type mismatch when the actual rows were returned. (Bug #26173)

CallableStatements with OUT/INOUT parameters that are "binary" (BLOB, BIT, (VAR)BINARY, JAVA_OBJECT) have extra 7 bytes. (Bug #25715)

Whitespace surrounding storage/size specifiers in stored procedure parameters declaration causes NumberFormatException to be thrown when calling stored procedure on JDK-1.5 or newer, as the Number classes in JDK-1.5+ are whitespace intolerant. (Bug #25624)

Client options not sent correctly when using SSL, leading to stored procedures not being able to return results. Thanks to Don Cohen for the bug report, testcase and patch. (Bug #25545)

Statement.setMaxRows() is not effective on result sets materialized from cursors. (Bug #25517)

BIT(> 1) is returned as java.lang.String from ResultSet.getObject() rather than byte[]. (Bug #25328)

Changes in MySQL Connector/J 5.0.5 (2007-03-02)

Functionality Added or Changed

Bugs Fixed

Other Changes

Functionality Added or Changed

Usage Advisor will now issue warnings for result sets with large numbers of rows. You can configure the trigger value by using the resultSetSizeThreshold parameter, which has a default value of 100.

The rewriteBatchedStatements feature can now be used with server-side prepared statements.

Important change: Due to a number of issues with the use of server-side prepared statements, Connector/J 5.0.5 has disabled their use by default. The disabling of server-side prepared statements does not affect the operation of the connector in any way.

To enable server-side prepared statements, add the following configuration property to your connector string:

useServerPrepStmts=true

The default value of this property is false (that is, Connector/J does not use server-side prepared statements).

Improved speed of datetime parsing for ResultSets that come from plain or nonserver-side prepared statements. You can enable old implementation with useFastDateParsing=false as a configuration parameter.

Usage Advisor now detects empty results sets and does not report on columns not referenced in those empty sets.

Fixed logging of XA commands sent to server, it is now configurable using logXaCommands property (defaults to false).

Added configuration property localSocketAddress, which is the host name or IP address given to explicitly configure the interface that the driver will bind the client side of the TCP/IP connection to when connecting.

We've added a new configuration option treatUtilDateAsTimestamp, which is false by default, as (1) We already had specific behavior to treat java.util.Date as a java.sql.Timestamp because it is useful to many folks, and (2) that behavior will very likely be required for drivers JDBC-post-4.0.

Bugs Fixed

Connection property socketFactory wasn't exposed using correctly named mutator/accessor, causing data source implementations that use JavaBean naming conventions to set properties to fail to set the property (and in the case of SJAS, fail silently when trying to set this parameter). (Bug #26326)

A query execution which timed out did not always throw a MySQLTimeoutException. (Bug #25836)

Storing a java.util.Date object in a BLOB column would not be serialized correctly during setObject. (Bug #25787)

Timer instance used for Statement.setQueryTimeout() created per-connection, rather than per-VM, causing memory leak. (Bug #25514)

EscapeProcessor gets confused by multiple backslashes. We now push the responsibility of syntax errors back on to the server for most escape sequences. (Bug #25399)

INOUT parameters in CallableStatements get doubly escaped. (Bug #25379)

When using the rewriteBatchedStatements connection option with PreparedState.executeBatch() an internal memory leak would occur. (Bug #25073)

Fixed issue where field-level for metadata from DatabaseMetaData when using INFORMATION_SCHEMA didn't have references to current connections, sometimes leading to Null Pointer Exceptions (NPEs) when introspecting them using ResultSetMetaData. (Bug #25073)

StringUtils.indexOfIgnoreCaseRespectQuotes() isn't case-insensitive on the first character of the target. This bug also affected rewriteBatchedStatements functionality when prepared statements did not use uppercase for the VALUES clause. (Bug #25047)

Client-side prepared statement parser gets confused by in-line comments /*...*/ and therefore cannot rewrite batch statements or reliably detect the type of statements when they are used. (Bug #25025)

Results sets from UPDATE statements that are part of multi-statement queries would cause an SQLException error, "Result is from UPDATE". (Bug #25009)

Specifying US-ASCII as the character set in a connection to a MySQL 4.1 or newer server does not map correctly. (Bug #24840)

Using DatabaseMetaData.getSQLKeywords() does not return a all of the of the reserved keywords for the current MySQL version. Current implementation returns the list of reserved words for MySQL 5.1, and does not distinguish between versions. (Bug #24794)

Calling Statement.cancel() could result in a Null Pointer Exception (NPE). (Bug #24721)

Using setFetchSize() breaks prepared SHOW and other commands. (Bug #24360)

Calendars and timezones are now lazily instantiated when required. (Bug #24351)

Using DATETIME columns would result in time shifts when useServerPrepStmts was true. This occurred due to different behavior when using client-side compared to server-side prepared statements and the useJDBCCompliantTimezoneShift option. This is now fixed if moving from server-side prepared statements to client-side prepared statements by setting useSSPSCompatibleTimezoneShift to true, as the driver can't tell if this is a new deployment that never used server-side prepared statements, or if it is an existing deployment that is switching to client-side prepared statements from server-side prepared statements. (Bug #24344)

Connector/J now returns a better error message when server doesn't return enough information to determine stored procedure/function parameter types. (Bug #24065)

A connection error would occur when connecting to a MySQL server with certain character sets. Some collations/character sets reported as "unknown" (specifically cias variants of existing character sets), and inability to override the detected server character set. (Bug #23645)

Inconsistency between getSchemas and INFORMATION_SCHEMA. (Bug #23304)

DatabaseMetaData.getSchemas() doesn't return a TABLE_CATALOG column. (Bug #23303)

When using a JDBC connection URL that is malformed, the NonRegisteringDriver.getPropertyInfo method will throw a Null Pointer Exception (NPE). (Bug #22628)

Some exceptions thrown out of StandardSocketFactory were needlessly wrapped, obscuring their true cause, especially when using socket timeouts. (Bug #21480)

When using a server-side prepared statement the driver would send timestamps to the server using nanoseconds instead of milliseconds. (Bug #21438)

When using server-side prepared statements and timestamp columns, value would be incorrectly populated (with nanoseconds, not microseconds). (Bug #21438)

ParameterMetaData throws NullPointerException when prepared SQL has a syntax error. Added generateSimpleParameterMetadata configuration property, which when set to true will generate metadata reflecting VARCHAR for every parameter (the default is false, which will cause an exception to be thrown if no parameter metadata for the statement is actually available). (Bug #21267)

The manifest file in the Connector/J JAR package was incorrect. (Bug #15641, Bug #11745464)

Fixed an issue where XADataSources couldn't be bound into JNDI, as the DataSourceFactory didn't know how to create instances of them.

Other Changes

Avoid static synchronized code in JVM class libraries for dealing with default timezones.

Performance enhancement of initial character set configuration, driver will only send commands required to configure connection character set session variables if the current values on the server do not match what is required.

Re-worked stored procedure parameter parser to be more robust. Driver no longer requires BEGIN in stored procedure definition, but does have requirement that if a stored function begins with a label directly after the "returns" clause, that the label is not a quoted identifier.

Throw exceptions encountered during timeout to thread calling Statement.execute*(), rather than RuntimeException.

Changed cached result set metadata (when using cacheResultSetMetadata=true) to be cached per-connection rather than per-statement as previously implemented.

Reverted back to internal character conversion routines for single-byte character sets, as the ones internal to the JVM are using much more CPU time than our internal implementation.

When extracting foreign key information from SHOW CREATE TABLE in DatabaseMetaData, ignore exceptions relating to tables being missing (which could happen for cross-reference or imported-key requests, as the list of tables is generated first, then iterated).

Fixed some Null Pointer Exceptions (NPEs) when cached metadata was used with UpdatableResultSets.

Take localSocketAddress property into account when creating instances of CommunicationsException when the underlying exception is a java.net.BindException, so that a friendlier error message is given with a little internal diagnostics.

Fixed cases where ServerPreparedStatements weren't using cached metadata when cacheResultSetMetadata=true was used.

Use a java.util.TreeMap to map column names to ordinal indexes for ResultSet.findColumn() instead of a HashMap. This enables us to have case-insensitive lookups (required by the JDBC specification) without resorting to the many transient object instances needed to support this requirement with a normal HashMap with either case-adjusted keys, or case-insensitive keys. (In the worst case scenario for lookups of a 1000 column result set, TreeMaps are about half as fast wall-clock time as a HashMap, however in normal applications their use gives many orders of magnitude reduction in transient object instance creation which pays off later for CPU usage in garbage collection).

When using cached metadata, skip field-level metadata packets coming from the server, rather than reading them and discarding them without creating com.mysql.jdbc.Field instances.

Changes in MySQL Connector/J 5.0.4 (2006-10-20)

Bugs Fixed

DBMD.getColumns() does not return expected COLUMN_SIZE for the SET type, now returns length of largest possible set disregarding whitespace or the "," delimiters to be consistent with the ODBC driver. (Bug #22613)

Added new _ci collations to CharsetMapping - utf8_unicode_ci not working. (Bug #22456)

Driver was using milliseconds for Statement.setQueryTimeout() when specification says argument is to be in seconds. (Bug #22359)

Workaround for server crash when calling stored procedures using a server-side prepared statement (driver now detects prepare(stored procedure) and substitutes client-side prepared statement). (Bug #22297)

Driver issues truncation on write exception when it shouldn't (due to sending big decimal incorrectly to server with server-side prepared statement). (Bug #22290)

Newlines causing whitespace to span confuse procedure parser when getting parameter metadata for stored procedures. (Bug #22024)

When using information_schema for metadata, COLUMN_SIZE for getColumns() is not clamped to range of java.lang.Integer as is the case when not using information_schema, thus leading to a truncation exception that isn't present when not using information_schema. (Bug #21544)

Column names don't match metadata in cases where server doesn't return original column names (column functions) thus breaking compatibility with applications that expect 1-to-1 mappings between findColumn() and rsmd.getColumnName(), usually manifests itself as "Can't find column ('')" exceptions. (Bug #21379)

Driver now sends numeric 1 or 0 for client-prepared statement setBoolean() calls instead of '1' or '0'.

Fixed configuration property jdbcCompliantTruncation was not being used for reads of result set values.

DatabaseMetaData correctly reports true for supportsCatalog*() methods.

Driver now supports {call sp} (without "()" if procedure has no arguments).

Changes in MySQL Connector/J 5.0.3 (2006-07-26, Beta)

Functionality Added or Changed

Bugs Fixed

Functionality Added or Changed

Added configuration option noAccessToProcedureBodies which will cause the driver to create basic parameter metadata for CallableStatements when the user does not have access to procedure bodies using SHOW CREATE PROCEDURE or selecting from mysql.proc instead of throwing an exception. The default value for this option is false

Bugs Fixed

Fixed Statement.cancel() causes NullPointerException if underlying connection has been closed due to server failure. (Bug #20650)

If the connection to the server has been closed due to a server failure, then the cleanup process will call Statement.cancel(), triggering a NullPointerException, even though there is no active connection. (Bug #20650)

Changes in MySQL Connector/J 5.0.2 (2006-07-11)

Bugs Fixed

MysqlXaConnection.recover(int flags) now permits combinations of XAResource.TMSTARTRSCAN and TMENDRSCAN. To simulate the “scanning” nature of the interface, we return all prepared XIDs for TMSTARTRSCAN, and no new XIDs for calls with TMNOFLAGS, or TMENDRSCAN when not in combination with TMSTARTRSCAN. This change was made for API compliance, as well as integration with IBM WebSphere's transaction manager. (Bug #20242)

Fixed MysqlValidConnectionChecker for JBoss doesn't work with MySQLXADataSources. (Bug #20242)

Added connection/datasource property pinGlobalTxToPhysicalConnection (defaults to false). When set to true, when using XAConnections, the driver ensures that operations on a given XID are always routed to the same physical connection. This enables the XAConnection to support XA START ... JOIN after XA END has been called, and is also a workaround for transaction managers that don't maintain thread affinity for a global transaction (most either always maintain thread affinity, or have it as a configuration option). (Bug #20242)

Better caching of character set converters (per-connection) to remove a bottleneck for multibyte character sets. (Bug #20242)

Fixed ConnectionProperties (and thus some subclasses) are not serializable, even though some J2EE containers expect them to be. (Bug #19169)

Fixed driver fails on non-ASCII platforms. The driver was assuming that the platform character set would be a superset of MySQL's latin1 when doing the handshake for authentication, and when reading error messages. We now use Cp1252 for all strings sent to the server during the handshake phase, and a hard-coded mapping of the language system variable to the character set that is used for error messages. (Bug #18086)

Fixed can't use XAConnection for local transactions when no global transaction is in progress. (Bug #17401)

Changes in MySQL Connector/J 5.0.1 (Not Released)

Not released due to a packaging error

Version 5.0.1 has no changelog entries, or they have not yet been published because the product version has not yet been released.

Changes in MySQL Connector/J 5.0.0 (2005-12-22)

Bugs Fixed

Added support for Connector/MXJ integration using url subprotocol jdbc:mysql:mxj://.... (Bug #14729)

Idle timeouts cause XAConnections to whine about rolling themselves back. (Bug #14729)

When fix for Bug #14562 was merged from 3.1.12, added functionality for CallableStatement's parameter metadata to return correct information for .getParameterClassName(). (Bug #14729)

Added service-provider entry to META-INF/services/java.sql.Driver for JDBC-4.0 support. (Bug #14729)

Fuller synchronization of Connection to avoid deadlocks when using multi-threaded frameworks that multi-thread a single connection (usually not recommended, but the JDBC spec permits it anyways), part of fix to Bug #14972). (Bug #14729)

Moved all SQLException constructor usage to a factory in SQLError (ground-work for JDBC-4.0 SQLState-based exception classes). (Bug #14729)

Removed Java5-specific calls to BigDecimal constructor (when result set value is '', (int)0 was being used as an argument indirectly using method return value. This signature doesn't exist prior to Java5.) (Bug #14729)

Implementation of Statement.cancel() and Statement.setQueryTimeout(). Both require MySQL-5.0.0 or newer server, require a separate connection to issue the KILL QUERY statement, and in the case of setQueryTimeout() creates an additional thread to handle the timeout functionality.

Note: Failures to cancel the statement for setQueryTimeout() may manifest themselves as RuntimeExceptions rather than failing silently, as there is currently no way to unblock the thread that is executing the query being cancelled due to timeout expiration and have it throw the exception instead. (Bug #14729)

Return "[VAR]BINARY" for RSMD.getColumnTypeName() when that is actually the type, and it can be distinguished (MySQL-4.1 and newer). (Bug #14729)

Attempt detection of the MySQL type BINARY (it is an alias, so this isn't always reliable), and use the java.sql.Types.BINARY type mapping for it.

Added unit tests for XADatasource, as well as friendlier exceptions for XA failures compared to the "stock" XAException (which has no messages).

If the connection useTimezone is set to true, then also respect time zone conversions in escape-processed string literals (for example, "{ts ...}" and "{t ...}").

Do not permit .setAutoCommit(true), or .commit() or .rollback() on an XA-managed connection as per the JDBC specification.

XADataSource implemented (ported from 3.2 branch which won't be released as a product). Use com.mysql.jdbc.jdbc2.optional.MysqlXADataSource as your datasource class name in your application server to utilize XA transactions in MySQL-5.0.10 and newer.

Moved -bin-g.jar file into separate debug subdirectory to avoid confusion.

Return original column name for RSMD.getColumnName() if the column was aliased, alias name for .getColumnLabel() (if aliased), and original table name for .getTableName(). Note this only works for MySQL-4.1 and newer, as older servers don't make this information available to clients.

Setting useJDBCCompliantTimezoneShift=true (it is not the default) causes the driver to use GMT for all TIMESTAMP/DATETIME time zones, and the current VM time zone for any other type that refers to time zones. This feature can not be used when useTimezone=true to convert between server and client time zones.

PreparedStatement.setString() didn't work correctly when sql_mode on server contained NO_BACKSLASH_ESCAPES and no characters that needed escaping were present in the string.

Add one level of indirection of internal representation of CallableStatement parameter metadata to avoid class not found issues on JDK-1.3 for ParameterMetadata interface (which doesn't exist prior to JDBC-3.0).

Changes in MySQL Connector/J 3.1

Changes in MySQL Connector/J 3.1.15 (Not released)

Important change: Due to a number of issues with the use of server-side prepared statements, Connector/J 5.0.5 has disabled their use by default. The disabling of server-side prepared statements does not affect the operation of the connector in any way.

To enable server-side prepared statements you must add the following configuration property to your connector string:

useServerPrepStmts=true

The default value of this property is false (that is, Connector/J does not use server-side prepared statements).

Bugs Fixed

Specifying US-ASCII as the character set in a connection to a MySQL 4.1 or newer server does not map correctly. (Bug #24840)

The manifest file in the Connector/J JAR package was incorrect. (Bug #15641, Bug #11745464)

Changes in MySQL Connector/J 3.1.14 (2006-10-19)

Bugs Fixed

Check and store value for continueBatchOnError property in constructor of Statements, rather than when executing batches, so that Connections closed out from underneath statements don't cause NullPointerExceptions when it is required to check this property. (Bug #22290)

Driver now sends numeric 1 or 0 for client-prepared statement setBoolean() calls instead of '1' or '0'. (Bug #22290)

Fixed bug where driver would not advance to next host if roundRobinLoadBalance=true and the last host in the list is down. (Bug #22290)

Driver issues truncation on write exception when it shouldn't (due to sending big decimal incorrectly to server with server-side prepared statement). (Bug #22290)

Fixed bug when calling stored functions, where parameters weren't numbered correctly (first parameter is now the return value, subsequent parameters if specified start at index "2"). (Bug #22290)

Removed logger autodetection altogether, must now specify logger explicitly if you want to use a logger other than one that logs to STDERR. (Bug #21207)

DDriver throws NPE when tracing prepared statements that have been closed (in asSQL()). (Bug #21207)

ResultSet.getSomeInteger() doesn't work for BIT(>1). (Bug #21062)

Escape of quotation marks in client-side prepared statements parsing not respected. Patch covers more than bug report, including NO_BACKSLASH_ESCAPES being set, and stacked quote characters forms of escaping (that is, '' or ""). (Bug #20888)

Fixed can't pool server-side prepared statements, exception raised when re-using them. (Bug #20687)

Fixed Updatable result set that contains a BIT column fails when server-side prepared statements are used. (Bug #20485)

Fixed updatable result set throws ClassCastException when there is row data and moveToInsertRow() is called. (Bug #20479)

Fixed ResultSet.getShort() for UNSIGNED TINYINT returns incorrect values when using server-side prepared statements. (Bug #20306)

ReplicationDriver does not always round-robin load balance depending on URL used for slaves list. (Bug #19993)

Fixed calling toString() on ResultSetMetaData for driver-generated (that is, from DatabaseMetaData method calls, or from getGeneratedKeys()) result sets would raise a NullPointerException. (Bug #19993)

Connection fails to localhost when using timeout and IPv6 is configured. (Bug #19726)

ResultSet.getFloatFromString() can't retrieve values near Float.MIN/MAX_VALUE. (Bug #18880)

DatabaseMetaData.getTables() or getColumns() with a bad catalog parameter threw an exception rather than return an empty result set (as required by the specification). (Bug #18258)

Fixed memory leak with profileSQL=true. (Bug #16987)

Fixed NullPointerException in MysqlDataSourceFactory due to Reference containing RefAddrs with null content. (Bug #16791)

Changes in MySQL Connector/J 3.1.13 (2006-05-26)

Bugs Fixed

Fixed PreparedStatement.setObject(int, Object, int) doesn't respect scale of BigDecimals. (Bug #19615)

Fixed ResultSet.wasNull() returns incorrect value when extracting native string from server-side prepared statement generated result set. (Bug #19282)

Fixed invalid classname returned for ResultSetMetaData.getColumnClassName() for BIGINT type. (Bug #19282)

Fixed case where driver wasn't reading server status correctly when fetching server-side prepared statement rows, which in some cases could cause warning counts to be off, or multiple result sets to not be read off the wire. (Bug #19282)

Fixed data truncation and getWarnings() only returns last warning in set. (Bug #18740)

Fixed aliased column names where length of name > 251 are corrupted. (Bug #18554)

Improved performance of retrieving BigDecimal, Time, Timestamp and Date values from server-side prepared statements by creating fewer short-lived instances of Strings when the native type is not an exact match for the requested type. (Bug #18496)

Added performance feature, re-writing of batched executes for Statement.executeBatch() (for all DML statements) and PreparedStatement.executeBatch() (for INSERTs with VALUE clauses only). Enable by using "rewriteBatchedStatements=true" in your JDBC URL. (Bug #18041)

Fixed issue where server-side prepared statements don't cause truncation exceptions to be thrown when truncation happens. (Bug #18041)

Fixed CallableStatement.registerOutParameter() not working when some parameters pre-populated. Still waiting for feedback from JDBC experts group to determine what correct parameter count from getMetaData() should be, however. (Bug #17898)

Fixed calling clearParameters() on a closed prepared statement causes NPE. (Bug #17587)

Map "latin1" on MySQL server to CP1252 for MySQL > 4.1.0. (Bug #17587)

Added additional accessor and mutator methods on ConnectionProperties so that DataSource users can use same naming as regular URL properties. (Bug #17587)

Fixed ResultSet.wasNull() not always reset correctly for booleans when done using conversion for server-side prepared statements. (Bug #17450)

Fixed Statement.getGeneratedKeys() throws NullPointerException when no query has been processed. (Bug #17099)

Fixed updatable result set doesn't return AUTO_INCREMENT values for insertRow() when multiple column primary keys are used. (the driver was checking for the existence of single-column primary keys and an autoincrement value > 0 instead of a straightforward isAutoIncrement() check). (Bug #16841)

DBMD.getColumns() returns wrong type for BIT. (Bug #15854)

lib-nodist directory missing from package breaks out-of-box build. (Bug #15676)

Fixed issue with ReplicationConnection incorrectly copying state, doesn't transfer connection context correctly when transitioning between the same read-only states. (Bug #15570)

No "dos" character set in MySQL > 4.1.0. (Bug #15544)

INOUT parameter does not store IN value. (Bug #15464)

PreparedStatement.setObject() serializes BigInteger as object, rather than sending as numeric value (and is thus not complementary to .getObject() on an UNSIGNED LONG type). (Bug #15383)

Fixed issue where driver was unable to initialize character set mapping tables. Removed reliance on .properties files to hold this information, as it turns out to be too problematic to code around class loader hierarchies that change depending on how an application is deployed. Moved information back into the CharsetMapping class. (Bug #14938)

Exception thrown for new decimal type when using updatable result sets. (Bug #14609)

Driver now aware of fix for BIT type metadata that went into MySQL-5.0.21 for server not reporting length consistently . (Bug #13601)

Added support for Apache Commons logging, use "com.mysql.jdbc.log.CommonsLogger" as the value for the "logger" configuration property. (Bug #13469)

Fixed driver trying to call methods that don't exist on older and newer versions of Log4j. The fix is not trying to auto-detect presence of log4j, too many different incompatible versions out there in the wild to do this reliably.

If you relied on autodetection before, you will need to add "logger=com.mysql.jdbc.log.Log4JLogger" to your JDBC URL to enable Log4J usage, or alternatively use the new "CommonsLogger" class to take care of this. (Bug #13469)

LogFactory now prepends com.mysql.jdbc.log to the log class name if it cannot be found as specified. This enables you to use “short names” for the built-in log factories, for example, logger=CommonsLogger instead of logger=com.mysql.jdbc.log.CommonsLogger. (Bug #13469)

ResultSet.getShort() for UNSIGNED TINYINT returned wrong values. (Bug #11874)

Changes in MySQL Connector/J 3.1.12 (2005-11-30)

Bugs Fixed

Process escape tokens in Connection.prepareStatement(...). You can disable this behavior by setting the JDBC URL configuration property processEscapeCodesForPrepStmts to false. (Bug #15141)

Usage advisor complains about unreferenced columns, even though they've been referenced. (Bug #15065)

Driver incorrectly closes streams passed as arguments to PreparedStatements. Reverts to legacy behavior by setting the JDBC configuration property autoClosePStmtStreams to true (also included in the 3-0-Compat configuration “bundle”). (Bug #15024)

Deadlock while closing server-side prepared statements from multiple threads sharing one connection. (Bug #14972)

Unable to initialize character set mapping tables (due to J2EE classloader differences). (Bug #14938)

Escape processor replaces quote character in quoted string with string delimiter. (Bug #14909)

DatabaseMetaData.getColumns() doesn't return TABLE_NAME correctly. (Bug #14815)

storesMixedCaseIdentifiers() returns false (Bug #14562)

storesLowerCaseIdentifiers() returns true (Bug #14562)

storesMixedCaseQuotedIdentifiers() returns false (Bug #14562)

storesMixedCaseQuotedIdentifiers() returns true (Bug #14562)

If lower_case_table_names=0 (on server):

storesLowerCaseIdentifiers() returns false

storesLowerCaseQuotedIdentifiers() returns false

storesMixedCaseIdentifiers() returns true

storesMixedCaseQuotedIdentifiers() returns true

storesUpperCaseIdentifiers() returns false

storesUpperCaseQuotedIdentifiers() returns true

(Bug #14562)

storesUpperCaseIdentifiers() returns false (Bug #14562)

storesUpperCaseQuotedIdentifiers() returns true (Bug #14562)

If lower_case_table_names=1 (on server):

storesLowerCaseIdentifiers() returns true

storesLowerCaseQuotedIdentifiers() returns true

storesMixedCaseIdentifiers() returns false

storesMixedCaseQuotedIdentifiers() returns false

storesUpperCaseIdentifiers() returns false

storesUpperCaseQuotedIdentifiers() returns true

(Bug #14562)

storesLowerCaseQuotedIdentifiers() returns true (Bug #14562)

Fixed DatabaseMetaData.stores*Identifiers():

If lower_case_table_names=0 (on server):

storesLowerCaseIdentifiers() returns false

storesLowerCaseQuotedIdentifiers() returns false

storesMixedCaseIdentifiers() returns true

storesMixedCaseQuotedIdentifiers() returns true

storesUpperCaseIdentifiers() returns false

storesUpperCaseQuotedIdentifiers() returns true

If lower_case_table_names=1 (on server):

storesLowerCaseIdentifiers() returns true

storesLowerCaseQuotedIdentifiers() returns true

storesMixedCaseIdentifiers() returns false

storesMixedCaseQuotedIdentifiers() returns false

storesUpperCaseIdentifiers() returns false

storesUpperCaseQuotedIdentifiers() returns true

(Bug #14562)

storesMixedCaseIdentifiers() returns true (Bug #14562)

storesLowerCaseQuotedIdentifiers() returns false (Bug #14562)

Java type conversion may be incorrect for MEDIUMINT. (Bug #14562)

storesLowerCaseIdentifiers() returns false (Bug #14562)

Added configuration property useGmtMillisForDatetimes which when set to true causes ResultSet.getDate(), .getTimestamp() to return correct millis-since GMT when .getTime() is called on the return value (currently default is false for legacy behavior). (Bug #14562)

Extraneous sleep on autoReconnect. (Bug #13775)

Reconnect during middle of executeBatch() should not occur if autoReconnect is enabled. (Bug #13255)

maxQuerySizeToLog is not respected. Added logging of bound values for execute() phase of server-side prepared statements when profileSQL=true as well. (Bug #13048)

OpenOffice expects DBMD.supportsIntegrityEnhancementFacility() to return true if foreign keys are supported by the datasource, even though this method also covers support for check constraints, which MySQL doesn't have. Setting the configuration property overrideSupportsIntegrityEnhancementFacility to true causes the driver to return true for this method. (Bug #12975)

Added com.mysql.jdbc.testsuite.url.default system property to set default JDBC url for testsuite (to speed up bug resolution when I'm working in Eclipse). (Bug #12975)

logSlowQueries should give better info. (Bug #12230)

Don't increase timeout for failover/reconnect. (Bug #6577)

Fixed client-side prepared statement bug with embedded ? characters inside quoted identifiers (it was recognized as a placeholder, when it was not).

Do not permit executeBatch() for CallableStatements with registered OUT/INOUT parameters (JDBC compliance).

Fall back to platform-encoding for URLDecoder.decode() when parsing driver URL properties if the platform doesn't have a two-argument version of this method.

Changes in MySQL Connector/J 3.1.11 (2005-10-07)

Bugs Fixed

The configuration property sessionVariables now permits you to specify variables that start with the “@” sign. (Bug #13453)

URL configuration parameters do not permit “&” or “=” in their values. The JDBC driver now parses configuration parameters as if they are encoded using the application/x-www-form-urlencoded format as specified by java.net.URLDecoder (http://java.sun.com/j2se/1.5.0/docs/api/java/net/URLDecoder.html).

If the “%” character is present in a configuration property, it must now be represented as %25, which is the encoded form of “%” when using application/x-www-form-urlencoded encoding. (Bug #13453)

Workaround for Bug #13374: ResultSet.getStatement() on closed result set returns NULL (as per JDBC 4.0 spec, but not backward-compatible). Set the connection property retainStatementAfterResultSetClose to true to be able to retrieve a ResultSet's statement after the ResultSet has been closed using .getStatement() (the default is false, to be JDBC-compliant and to reduce the chance that code using JDBC leaks Statement instances). (Bug #13277)

ResultSetMetaData from Statement.getGeneratedKeys() caused a NullPointerException to be thrown whenever a method that required a connection reference was called. (Bug #13277)

Backport of VAR[BINARY|CHAR] [BINARY] types detection from 5.0 branch. (Bug #13277)

Fixed NullPointerException when converting catalog parameter in many DatabaseMetaDataMethods to byte[]s (for the result set) when the parameter is null. (null is not technically permitted by the JDBC specification, but we have historically permitted it). (Bug #13277)

Backport of Field class, ResultSetMetaData.getColumnClassName(), and ResultSet.getObject(int) changes from 5.0 branch to fix behavior surrounding VARCHAR BINARY/VARBINARY and related types. (Bug #13277)

Read response in MysqlIO.sendFileToServer(), even if the local file can't be opened, otherwise next query issued will fail, because it is reading the response to the empty LOAD DATA INFILE packet sent to the server. (Bug #13277)

When gatherPerfMetrics is enabled for servers older than 4.1.0, a NullPointerException is thrown from the constructor of ResultSet if the query doesn't use any tables. (Bug #13043)

java.sql.Types.OTHER returned for BINARY and VARBINARY columns when using DatabaseMetaData.getColumns(). (Bug #12970)

ServerPreparedStatement.getBinding() now checks if the statement is closed before attempting to reference the list of parameter bindings, to avoid throwing a NullPointerException. (Bug #12970)

Tokenizer for = in URL properties was causing sessionVariables=.... to be parameterized incorrectly. (Bug #12753)

cp1251 incorrectly mapped to win1251 for servers newer than 4.0.x. (Bug #12752)

getExportedKeys() (Bug #12541)

Specifying a catalog works as stated in the API docs. (Bug #12541)

Specifying NULL means that catalog will not be used to filter the results (thus all databases will be searched), unless you've set nullCatalogMeansCurrent=true in your JDBC URL properties. (Bug #12541)

getIndexInfo() (Bug #12541)

getProcedures() (and thus indirectly getProcedureColumns()) (Bug #12541)

getImportedKeys() (Bug #12541)

Specifying "" means “current” catalog, even though this isn't quite JDBC spec compliant, it is there for legacy users. (Bug #12541)

getCrossReference() (Bug #12541)

Added Connection.isMasterConnection() for clients to be able to determine if a multi-host master/slave connection is connected to the first host in the list. (Bug #12541)

getColumns() (Bug #12541)

Handling of catalog argument in DatabaseMetaData.getIndexInfo(), which also means changes to the following methods in DatabaseMetaData:

getBestRowIdentifier()

getColumns()

getCrossReference()

getExportedKeys()

getImportedKeys()

getIndexInfo()

getPrimaryKeys()

getProcedures() (and thus indirectly getProcedureColumns())

getTables()

The catalog argument in all of these methods now behaves in the following way:

Specifying NULL means that catalog will not be used to filter the results (thus all databases will be searched), unless you've set nullCatalogMeansCurrent=true in your JDBC URL properties.

Specifying "" means “current” catalog, even though this isn't quite JDBC spec compliant, it is there for legacy users.

Specifying a catalog works as stated in the API docs.

Made Connection.clientPrepare() available from “wrapped” connections in the jdbc2.optional package (connections built by ConnectionPoolDataSource instances).

(Bug #12541)

getBestRowIdentifier() (Bug #12541)

Made Connection.clientPrepare() available from “wrapped” connections in the jdbc2.optional package (connections built by ConnectionPoolDataSource instances). (Bug #12541)

getTables() (Bug #12541)

getPrimaryKeys() (Bug #12541)

Connection.prepareCall() is database name case-sensitive (on Windows systems). (Bug #12417)

explainSlowQueries hangs with server-side prepared statements. (Bug #12229)

Properties shared between master and slave with replication connection. (Bug #12218)

Geometry types not handled with server-side prepared statements. (Bug #12104)

maxPerformance.properties mis-spells “elideSetAutoCommits”. (Bug #11976)

ReplicationConnection won't switch to slave, throws “Catalog can't be null” exception. (Bug #11879)

Pstmt.setObject(...., Types.BOOLEAN) throws exception. (Bug #11798)

Escape tokenizer doesn't respect stacked single quotation marks for escapes. (Bug #11797)

GEOMETRY type not recognized when using server-side prepared statements. (Bug #11797)

Foreign key information that is quoted is parsed incorrectly when DatabaseMetaData methods use that information. (Bug #11781)

The sendBlobChunkSize property is now clamped to max_allowed_packet with consideration of stream buffer size and packet headers to avoid PacketTooBigExceptions when max_allowed_packet is similar in size to the default sendBlobChunkSize which is 1M. (Bug #11781)

CallableStatement.clearParameters() now clears resources associated with INOUT/OUTPUT parameters as well as INPUT parameters. (Bug #11781)

Fixed regression caused by fix for Bug #11552 that caused driver to return incorrect values for unsigned integers when those integers where within the range of the positive signed type. (Bug #11663)

Moved source code to Subversion repository. (Bug #11663)

Incorrect generation of testcase scripts for server-side prepared statements. (Bug #11663)

Fixed statements generated for testcases missing ; for “plain” statements. (Bug #11629)

Spurious ! on console when character encoding is utf8. (Bug #11629)

StringUtils.getBytes() doesn't work when using multibyte character encodings and a length in characters is specified. (Bug #11614)

DBMD.storesLower/Mixed/UpperIdentifiers() reports incorrect values for servers deployed on Windows. (Bug #11575)

Reworked Field class, *Buffer, and MysqlIO to be aware of field lengths > Integer.MAX_VALUE. (Bug #11498)

Escape processor didn't honor strings demarcated with double quotation marks. (Bug #11498)

Updated DBMD.supportsCorrelatedQueries() to return true for versions > 4.1, supportsGroupByUnrelated() to return true and getResultSetHoldability() to return HOLD_CURSORS_OVER_COMMIT. (Bug #11498)

Lifted restriction of changing streaming parameters with server-side prepared statements. As long as all streaming parameters were set before execution, .clearParameters() does not have to be called. (due to limitation of client/server protocol, prepared statements can not reset individual stream data on the server side). (Bug #11498)

ResultSet.moveToCurrentRow() fails to work when preceded by a call to ResultSet.moveToInsertRow(). (Bug #11190)

VARBINARY data corrupted when using server-side prepared statements and .setBytes(). (Bug #11115)

Statement.getWarnings() fails with NPE if statement has been closed. (Bug #10630)

Only get char[] from SQL in PreparedStatement.ParseInfo() when needed. (Bug #10630)

Changes in MySQL Connector/J 3.1.10 (2005-06-23)

Bugs Fixed

Initial implemention of ParameterMetadata for PreparedStatement.getParameterMetadata(). Only works fully for CallableStatements, as current server-side prepared statements return every parameter as a VARCHAR type.

Fixed connecting without a database specified raised an exception in MysqlIO.changeDatabaseTo().

Changes in MySQL Connector/J 3.1.9 (2005-06-22)

Bugs Fixed

Production package doesn't include JBoss integration classes. (Bug #11411)

Removed nonsensical “costly type conversion” warnings when using usage advisor. (Bug #11411)

Fixed PreparedStatement.setClob() not accepting null as a parameter. (Bug #11360)

Connector/J dumping query into SQLException twice. (Bug #11360)

autoReconnect ping causes exception on connection startup. (Bug #11259)

Connection.setCatalog() is now aware of the useLocalSessionState configuration property, which when set to true will prevent the driver from sending USE ... to the server if the requested catalog is the same as the current catalog. (Bug #11115)

3-0-Compat: Compatibility with Connector/J 3.0.x functionality (Bug #11115)

maxPerformance: Maximum performance without being reckless (Bug #11115)

solarisMaxPerformance: Maximum performance for Solaris, avoids syscalls where it can (Bug #11115)

Added maintainTimeStats configuration property (defaults to true), which tells the driver whether or not to keep track of the last query time and the last successful packet sent to the server's time. If set to false, removes two syscalls per query. (Bug #11115)

VARBINARY data corrupted when using server-side prepared statements and ResultSet.getBytes(). (Bug #11115)

Added the following configuration bundles, use one or many using the useConfigs configuration property:

maxPerformance: Maximum performance without being reckless

solarisMaxPerformance: Maximum performance for Solaris, avoids syscalls where it can

3-0-Compat: Compatibility with Connector/J 3.0.x functionality

(Bug #11115)

Try to handle OutOfMemoryErrors more gracefully. Although not much can be done, they will in most cases close the connection they happened on so that further operations don't run into a connection in some unknown state. When an OOM has happened, any further operations on the connection will fail with a “Connection closed” exception that will also list the OOM exception as the reason for the implicit connection close event. (Bug #10850)

Setting cachePrepStmts=true now causes the Connection to also cache the check the driver performs to determine if a prepared statement can be server-side or not, as well as caches server-side prepared statements for the lifetime of a connection. As before, the prepStmtCacheSize parameter controls the size of these caches. (Bug #10850)

Don't send COM_RESET_STMT for each execution of a server-side prepared statement if it isn't required. (Bug #10850)

0-length streams not sent to server when using server-side prepared statements. (Bug #10850)

Driver detects if you're running MySQL-5.0.7 or later, and does not scan for LIMIT ?[,?] in statements being prepared, as the server supports those types of queries now. (Bug #10850)

Reorganized directory layout. Sources now are in src folder. Don't pollute parent directory when building, now output goes to ./build, distribution goes to ./dist. (Bug #10496)

Added support/bug hunting feature that generates .sql test scripts to STDERR when autoGenerateTestcaseScript is set to true. (Bug #10496)

SQLException is thrown when using property characterSetResults with cp932 or eucjpms. (Bug #10496)

The data type returned for TINYINT(1) columns when tinyInt1isBit=true (the default) can be switched between Types.BOOLEAN and Types.BIT using the new configuration property transformedBitIsBoolean, which defaults to false. If set to false (the default), DatabaseMetaData.getColumns() and ResultSetMetaData.getColumnType() will return Types.BOOLEAN for TINYINT(1) columns. If true, Types.BOOLEAN will be returned instead. Regardless of this configuration property, if tinyInt1isBit is enabled, columns with the type TINYINT(1) will be returned as java.lang.Boolean instances from ResultSet.getObject(...), and ResultSetMetaData.getColumnClassName() will return java.lang.Boolean. (Bug #10485)

SQLException thrown when retrieving YEAR(2) with ResultSet.getString(). The driver will now always treat YEAR types as java.sql.Dates and return the correct values for getString(). Alternatively, the yearIsDateType connection property can be set to false and the values will be treated as SHORTs. (Bug #10485)

Driver doesn't support {?=CALL(...)} for calling stored functions. This involved adding support for function retrieval to DatabaseMetaData.getProcedures() and getProcedureColumns() as well. (Bug #10310)

Unsigned SMALLINT treated as signed for ResultSet.getInt(), fixed all cases for UNSIGNED integer values and server-side prepared statements, as well as ResultSet.getObject() for UNSIGNED TINYINT. (Bug #10156)

Made ServerPreparedStatement.asSql() work correctly so auto-explain functionality would work with server-side prepared statements. (Bug #10155)

Double quotation marks not recognized when parsing client-side prepared statements. (Bug #10155)

Made JDBC2-compliant wrappers public to enable access to vendor extensions. (Bug #10155)

DatabaseMetaData.supportsMultipleOpenResults() now returns true. The driver has supported this for some time, DBMD just missed that fact. (Bug #10155)

Cleaned up logging of profiler events, moved code to dump a profiler event as a string to com.mysql.jdbc.log.LogUtils so that third parties can use it. (Bug #10155)

Made enableStreamingResults() visible on com.mysql.jdbc.jdbc2.optional.StatementWrapper. (Bug #10155)

Actually write manifest file to correct place so it ends up in the binary jar file. (Bug #10144)

Added createDatabaseIfNotExist property (default is false), which will cause the driver to ask the server to create the database specified in the URL if it doesn't exist. You must have the appropriate privileges for database creation for this to work. (Bug #10144)

Memory leak in ServerPreparedStatement if serverPrepare() fails. (Bug #10144)

com.mysql.jdbc.PreparedStatement.ParseInfo does unnecessary call to toCharArray(). (Bug #9064)

Driver now correctly uses CP932 if available on the server for Windows-31J, CP932 and MS932 java encoding names, otherwise it resorts to SJIS, which is only a close approximation. Currently only MySQL-5.0.3 and newer (and MySQL-4.1.12 or .13, depending on when the character set gets backported) can reliably support any variant of CP932.

Overhaul of character set configuration, everything now lives in a properties file.

Changes in MySQL Connector/J 3.1.8 (2005-04-14)

Bugs Fixed

Should accept null for catalog (meaning use current) in DBMD methods, even though it is not JDBC-compliant for legacy's sake. Disable by setting connection property nullCatalogMeansCurrent to false (which will be the default value in C/J 3.2.x). (Bug #9917)

Fixed driver not returning true for -1 when ResultSet.getBoolean() was called on result sets returned from server-side prepared statements. (Bug #9778)

Added a Manifest.MF file with implementation information to the .jar file. (Bug #9778)

More tests in Field.isOpaqueBinary() to distinguish opaque binary (that is, fields with type CHAR(n) and CHARACTER SET BINARY) from output of various scalar and aggregate functions that return strings. (Bug #9778)

DBMD.getTables() shouldn't return tables if views are asked for, even if the database version doesn't support views. (Bug #9778)

Should accept null for name patterns in DBMD (meaning “%”), even though it isn't JDBC compliant, for legacy's sake. Disable by setting connection property nullNamePatternMatchesAll to false (which will be the default value in C/J 3.2.x). (Bug #9769)

The performance metrics feature now gathers information about number of tables referenced in a SELECT. (Bug #9704)

The logging system is now automatically configured. If the value has been set by the user, using the URL property logger or the system property com.mysql.jdbc.logger, then use that, otherwise, autodetect it using the following steps:

Log4j, if it is available,

Then JDK1.4 logging,

Then fallback to our STDERR logging.

(Bug #9704)

Statement.getMoreResults() could throw NPE when existing result set was .close()d. (Bug #9704)

Stored procedures with DECIMAL parameters with storage specifications that contained “,” in them failed. (Bug #9682)

PreparedStatement.setObject(int, Object, int type, int scale) now uses scale value for BigDecimal instances. (Bug #9682)

Added support for the c3p0 connection pool's (http://c3p0.sf.net/) validation/connection checker interface which uses the lightweight COM_PING call to the server if available. To use it, configure your c3p0 connection pool's connectionTesterClassName property to use com.mysql.jdbc.integration.c3p0.MysqlConnectionTester. (Bug #9320)

PreparedStatement.getMetaData() inserts blank row in database under certain conditions when not using server-side prepared statements. (Bug #9320)

Better detection of LIMIT inside/outside of quoted strings so that the driver can more correctly determine whether a prepared statement can be prepared on the server or not. (Bug #9320)

Connection.canHandleAsPreparedStatement() now makes “best effort” to distinguish LIMIT clauses with placeholders in them from ones without to have fewer false positives when generating work-arounds for statements the server cannot currently handle as server-side prepared statements. (Bug #9320)

Fixed build.xml to not compile log4j logging if log4j not available. (Bug #9320)

Added finalizers to ResultSet and Statement implementations to be JDBC spec-compliant, which requires that if not explicitly closed, these resources should be closed upon garbage collection. (Bug #9319)

Stored procedures with same name in different databases confuse the driver when it tries to determine parameter counts/types. (Bug #9319)

A continuation of Bug #8868, where functions used in queries that should return nonstring types when resolved by temporary tables suddenly become opaque binary strings (work-around for server limitation). Also fixed fields with type of CHAR(n) CHARACTER SET BINARY to return correct/matching classes for RSMD.getColumnClassName() and ResultSet.getObject(). (Bug #9236)

Cannot use UTF-8 for characterSetResults configuration property. (Bug #9206)

PreparedStatement.addBatch() doesn't work with server-side prepared statements and streaming BINARY data. (Bug #9040)

ServerPreparedStatements now correctly “stream” BLOB/CLOB data to the server. You can configure the threshold chunk size using the JDBC URL property blobSendChunkSize (the default is 1MB). (Bug #8868)

DATE_FORMAT() queries returned as BLOBs from getObject(). (Bug #8868)

Server-side session variables can be preset at connection time by passing them as a comma-delimited list for the connection property sessionVariables. (Bug #8868)

BlobFromLocator now uses correct identifier quoting when generating prepared statements. (Bug #8868)

Fixed regression in ping() for users using autoReconnect=true. (Bug #8868)

Check for empty strings ('') when converting CHAR/VARCHAR column data to numbers, throw exception if emptyStringsConvertToZero configuration property is set to false (for backward-compatibility with 3.0, it is now set to true by default, but will most likely default to false in 3.2). (Bug #8803)

DATA_TYPE column from DBMD.getBestRowIdentifier() causes ArrayIndexOutOfBoundsException when accessed (and in fact, didn't return any value). (Bug #8803)

DBMD.supportsMixedCase*Identifiers() returns wrong value on servers running on case-sensitive file systems. (Bug #8800)

DBMD.supportsResultSetConcurrency() not returning true for forward-only/read-only result sets (we obviously support this). (Bug #8792)

Fixed ResultSet.getTime() on a NULL value for server-side prepared statements throws NPE.

Made Connection.ping() a public method.

Added support for new precision-math DECIMAL type in MySQL 5.0.3 and up.

Fixed DatabaseMetaData.getTables() returning views when they were not asked for as one of the requested table types.

Changes in MySQL Connector/J 3.1.7 (2005-02-18)

Bugs Fixed

PreparedStatements not creating streaming result sets. (Bug #8487)

Don't pass NULL to String.valueOf() in ResultSet.getNativeConvertToString(), as it stringifies it (that is, returns null), which is not correct for the method in question. (Bug #8487)

Fixed NPE in ResultSet.realClose() when using usage advisor and result set was already closed. (Bug #8428)

ResultSet.getString() doesn't maintain format stored on server, bug fix only enabled when noDatetimeStringSync property is set to true (the default is false). (Bug #8428)

Added support for BIT type in MySQL-5.0.3. The driver will treat BIT(1-8) as the JDBC standard BIT type (which maps to java.lang.Boolean), as the server does not currently send enough information to determine the size of a bitfield when < 9 bits are declared. BIT(>9) will be treated as VARBINARY, and will return byte[] when getObject() is called. (Bug #8424)

Added useLocalSessionState configuration property, when set to true the JDBC driver trusts that the application is well-behaved and only sets autocommit and transaction isolation levels using the methods provided on java.sql.Connection, and therefore can manipulate these values in many cases without incurring round-trips to the database server. (Bug #8424)

Added enableStreamingResults() to Statement for connection pool implementations that check Statement.setFetchSize() for specification-compliant values. Call Statement.setFetchSize(>=0) to disable the streaming results for that statement. (Bug #8424)

ResultSet.getBigDecimal() throws exception when rounding would need to occur to set scale. The driver now chooses a rounding mode of “half up” if nonrounding BigDecimal.setScale() fails. (Bug #8424)

Fixed synchronization issue with ServerPreparedStatement.serverPrepare() that could cause deadlocks/crashes if connection was shared between threads. (Bug #8096)

Emulated locators corrupt binary data when using server-side prepared statements. (Bug #8096)

Infinite recursion when “falling back” to master in failover configuration. (Bug #7952)

Disable multi-statements (if enabled) for MySQL-4.1 versions prior to version 4.1.10 if the query cache is enabled, as the server returns wrong results in this configuration. (Bug #7952)

Removed dontUnpackBinaryResults functionality, the driver now always stores results from server-side prepared statements as is from the server and unpacks them on demand. (Bug #7952)

Fixed duplicated code in configureClientCharset() that prevented useOldUTF8Behavior=true from working properly. (Bug #7952)

Added holdResultsOpenOverStatementClose property (default is false), that keeps result sets open over statement.close() or new execution on same statement (suggested by Kevin Burton). (Bug #7715)

Detect new sql_mode variable in string form (it used to be integer) and adjust quoting method for strings appropriately. (Bug #7715)

Timestamps converted incorrectly to strings with server-side prepared statements and updatable result sets. (Bug #7715)

Timestamp key column data needed _binary stripped for UpdatableResultSet.refreshRow(). (Bug #7686)

Connector/J now supports the NO_BACKSLASH_ESCAPES server SQL mode. (Bug #7374, Bug #16730296)

Choose correct “direction” to apply time adjustments when both client and server are in GMT time zone when using ResultSet.get(..., cal) and PreparedStatement.set(...., cal). (Bug #4718)

Remove _binary introducer from parameters used as in/out parameters in CallableStatement. (Bug #4718)

Always return byte[]s for output parameters registered as *BINARY. (Bug #4718)

By default, the driver now scans SQL you are preparing using all variants of Connection.prepareStatement() to determine if it is a supported type of statement to prepare on the server side, and if it is not supported by the server, it instead prepares it as a client-side emulated prepared statement. You can disable this by passing emulateUnsupportedPstmts=false in your JDBC URL. (Bug #4718)

Added dontTrackOpenResources option (default is false, to be JDBC compliant), which helps with memory use for nonwell-behaved apps (that is, applications that don't close Statement objects when they should). (Bug #4718)

Send correct value for “boolean” true to server for PreparedStatement.setObject(n, "true", Types.BIT). (Bug #4718)

Fixed bug with Connection not caching statements from prepareStatement() when the statement wasn't a server-side prepared statement. (Bug #4718)

Changes in MySQL Connector/J 3.1.6 (2004-12-23)

Bugs Fixed

DBMD.getProcedures() doesn't respect catalog parameter. (Bug #7026)

Fixed hang on SocketInputStream.read() with Statement.setMaxRows() and multiple result sets when driver has to truncate result set directly, rather than tacking a LIMIT n on the end of it.

Changes in MySQL Connector/J 3.1.5 (2004-12-02)

Bugs Fixed

Use 1MB packet for sending file for LOAD DATA LOCAL INFILE if that is < max_allowed_packet on server. (Bug #6537)

SUM() on DECIMAL with server-side prepared statement ignores scale if zero-padding is needed (this ends up being due to conversion to DOUBLE by server, which when converted to a string to parse into BigDecimal, loses all “padding” zeros). (Bug #6537)

Use DatabaseMetaData.getIdentifierQuoteString() when building DBMD queries. (Bug #6537)

Use our own implementation of buffered input streams to get around blocking behavior of java.io.BufferedInputStream. Disable this with useReadAheadInput=false. (Bug #6399)

Make auto-deserialization of java.lang.Objects stored in BLOB columns configurable using autoDeserialize property (defaults to false). (Bug #6399)

ResultSetMetaData.getColumnDisplaySize() returns incorrect values for multibyte charsets. (Bug #6399)

Re-work Field.isOpaqueBinary() to detect CHAR(n) CHARACTER SET BINARY to support fixed-length binary fields for ResultSet.getObject(). (Bug #6399)

Failing to connect to the server when one of the addresses for the given host name is IPV6 (which the server does not yet bind on). The driver now loops through all IP addresses for a given host, and stops on the first one that accepts() a socket.connect(). (Bug #6348)

Removed unwanted new Throwable() in ResultSet constructor due to bad merge (caused a new object instance that was never used for every result set created). Found while profiling for Bug #6359. (Bug #6225)

ServerSidePreparedStatement allocating short-lived objects unnecessarily. (Bug #6225)

Use null-safe-equals for key comparisons in updatable result sets. (Bug #6225)

Fixed too-early creation of StringBuffer in EscapeProcessor.escapeSQL(), also return String when escaping not needed (to avoid unnecessary object allocations). Found while profiling for Bug #6359. (Bug #6225)

UNSIGNED BIGINT unpacked incorrectly from server-side prepared statement result sets. (Bug #5729)

Added experimental configuration property dontUnpackBinaryResults, which delays unpacking binary result set values until they're asked for, and only creates object instances for nonnumeric values (it is set to false by default). For some usecase/jvm combinations, this is friendlier on the garbage collector. (Bug #5706)

Don't throw exceptions for Connection.releaseSavepoint(). (Bug #5706)

Inefficient detection of pre-existing string instances in ResultSet.getNativeString(). (Bug #5706)

Use a per-session Calendar instance by default when decoding dates from ServerPreparedStatements (set to old, less performant behavior by setting property dynamicCalendars=true). (Bug #5706)

Fixed batched updates with server prepared statements weren't looking if the types had changed for a given batched set of parameters compared to the previous set, causing the server to return the error “Wrong arguments to mysql_stmt_execute()”. (Bug #5235)

Handle case when string representation of timestamp contains trailing “.” with no numbers following it. (Bug #5235)

Server-side prepared statements did not honor zeroDateTimeBehavior property, and would cause class-cast exceptions when using ResultSet.getObject(), as the all-zero string was always returned. (Bug #5235)

Fix comparisons made between string constants and dynamic strings that are converted with either toUpperCase() or toLowerCase() to use Locale.ENGLISH, as some locales “override” case rules for English. Also use StringUtils.indexOfIgnoreCase() instead of .toUpperCase().indexOf(), avoids creating a very short-lived transient String instance.

Changes in MySQL Connector/J 3.1.4 (2004-09-04)

Bugs Fixed

Fixed ServerPreparedStatement to read prepared statement metadata off the wire, even though it is currently a placeholder instead of using MysqlIO.clearInputStream() which didn't work at various times because data wasn't available to read from the server yet. This fixes sporadic errors users were having with ServerPreparedStatements throwing ArrayIndexOutOfBoundExceptions. (Bug #5032)

Added three ways to deal with all-zero datetimes when reading them from a ResultSet: exception (the default), which throws an SQLException with an SQLState of S1009; convertToNull, which returns NULL instead of the date; and round, which rounds the date to the nearest closest value which is '0001-01-01'. (Bug #5032)

The driver is more strict about truncation of numerics on ResultSet.get*(), and will throw an SQLException when truncation is detected. You can disable this by setting jdbcCompliantTruncation to false (it is enabled by default, as this functionality is required for JDBC compliance). (Bug #5032)

You can now use URLs in LOAD DATA LOCAL INFILE statements, and the driver will use Java's built-in handlers for retrieving the data and sending it to the server. This feature is not enabled by default, you must set the allowUrlInLocalInfile connection property to true. (Bug #5032)

ResultSet.getObject() doesn't return type Boolean for pseudo-bit types from prepared statements on 4.1.x (shortcut for avoiding extra type conversion when using binary-encoded result sets obscured test in getObject() for “pseudo” bit type). (Bug #5032)

Use com.mysql.jdbc.Message's classloader when loading resource bundle, should fix sporadic issues when the caller's classloader can't locate the resource bundle. (Bug #5032)

ServerPreparedStatements dealing with return of DECIMAL type don't work. (Bug #5012)

Track packet sequence numbers if enablePacketDebug=true, and throw an exception if packets received out-of-order. (Bug #4689)

ResultSet.wasNull() does not work for primitives if a previous null was returned. (Bug #4689)

Optimized integer number parsing, enable “old” slower integer parsing using JDK classes using useFastIntParsing=false property. (Bug #4642)

Added useOnlyServerErrorMessages property, which causes message text in exceptions generated by the server to only contain the text sent by the server (as opposed to the SQLState's “standard” description, followed by the server's error message). This property is set to true by default. (Bug #4642)

ServerPreparedStatement.execute*() sometimes threw ArrayIndexOutOfBoundsException when unpacking field metadata. (Bug #4642)

Connector/J 3.1.3 beta does not handle integers correctly (caused by changes to support unsigned reads in Buffer.readInt() -> Buffer.readShort()). (Bug #4510)

Added support in DatabaseMetaData.getTables() and getTableTypes() for views, which are now available in MySQL server 5.0.x. (Bug #4510)

ResultSet.getObject() returns wrong type for strings when using prepared statements. (Bug #4482)

Calling MysqlPooledConnection.close() twice (even though an application error), caused NPE. Fixed. (Bug #4482)

Changes in MySQL Connector/J 3.1.3 (2004-07-07)

Bugs Fixed

Support new time zone variables in MySQL-4.1.3 when useTimezone=true. (Bug #4311)

Error in retrieval of mediumint column with prepared statements and binary protocol. (Bug #4311)

Support for unsigned numerics as return types from prepared statements. This also causes a change in ResultSet.getObject() for the bigint unsigned type, which used to return BigDecimal instances, it now returns instances of java.lang.BigInteger. (Bug #4311)

Externalized more messages (on-going effort). (Bug #4119)

Null bitmask sent for server-side prepared statements was incorrect. (Bug #4119)

Added constants for MySQL error numbers (publicly accessible, see com.mysql.jdbc.MysqlErrorNumbers), and the ability to generate the mappings of vendor error codes to SQLStates that the driver uses (for documentation purposes). (Bug #4119)

Added packet debugging code (see the enablePacketDebug property documentation). (Bug #4119)

Use SQL Standard SQL states by default, unless useSqlStateCodes property is set to false. (Bug #4119)

Mangle output parameter names for CallableStatements so they will not clash with user variable names.

Added support for INOUT parameters in CallableStatements.

Changes in MySQL Connector/J 3.1.2 (2004-06-09)

Bugs Fixed

Don't enable server-side prepared statements for server version 5.0.0 or 5.0.1, as they aren't compatible with the '4.1.2+' style that the driver uses (the driver expects information to come back that isn't there, so it hangs). (Bug #3804)

getWarnings() returns SQLWarning instead of DataTruncation. (Bug #3804)

getProcedureColumns() doesn't work with wildcards for procedure name. (Bug #3540)

getProcedures() does not return any procedures in result set. (Bug #3539)

Fixed DatabaseMetaData.getProcedures() when run on MySQL-5.0.0 (output of SHOW PROCEDURE STATUS changed between 5.0.0 and 5.0.1. (Bug #3520)

Added connectionCollation property to cause driver to issue set collation_connection=... query on connection init if default collation for given charset is not appropriate. (Bug #3520)

DBMD.getSQLStateType() returns incorrect value. (Bug #3520)

Correctly map output parameters to position given in prepareCall() versus. order implied during registerOutParameter(). (Bug #3146)

Cleaned up detection of server properties. (Bug #3146)

Correctly detect initial character set for servers >= 4.1.0. (Bug #3146)

Support placeholder for parameter metadata for server >= 4.1.2. (Bug #3146)

Added gatherPerformanceMetrics property, along with properties to control when/where this info gets logged (see docs for more info).

Fixed case when no parameters could cause a NullPointerException in CallableStatement.setOutputParameters().

Enabled callable statement caching using cacheCallableStmts property.

Fixed sending of split packets for large queries, enabled nio ability to send large packets as well.

Added .toString() functionality to ServerPreparedStatement, which should help if you're trying to debug a query that is a prepared statement (it shows SQL as the server would process).

Added logSlowQueries property, along with slowQueriesThresholdMillis property to control when a query should be considered “slow.”

Removed wrapping of exceptions in MysqlIO.changeUser().

Fixed stored procedure parameter parsing info when size was specified for a parameter (for example, char(), varchar()).

ServerPreparedStatements weren't actually de-allocating server-side resources when .close() was called.

Fixed case when no output parameters specified for a stored procedure caused a bogus query to be issued to retrieve out parameters, leading to a syntax error from the server.

Changes in MySQL Connector/J 3.1.1 (2004-02-14)

Bugs Fixed

Use DocBook version of docs for shipped versions of drivers. (Bug #2671)

NULL fields were not being encoded correctly in all cases in server-side prepared statements. (Bug #2671)

Fixed rare buffer underflow when writing numbers into buffers for sending prepared statement execution requests. (Bug #2671)

Fixed ConnectionProperties that weren't properly exposed through accessors, cleaned up ConnectionProperties code. (Bug #2623)

Class-cast exception when using scrolling result sets and server-side prepared statements. (Bug #2623)

Merged unbuffered input code from 3.0. (Bug #2623)

Enabled streaming of result sets from server-side prepared statements. (Bug #2606)

Server-side prepared statements were not returning data type YEAR correctly. (Bug #2606)

Fixed charset conversion issue in getTables(). (Bug #2502)

Implemented multiple result sets returned from a statement or stored procedure. (Bug #2502)

Implemented Connection.prepareCall(), and DatabaseMetaData. getProcedures() and getProcedureColumns(). (Bug #2359)

Merged prepared statement caching, and .getMetaData() support from 3.0 branch. (Bug #2359)

Fixed off-by-1900 error in some cases for years in TimeUtil.fastDate/TimeCreate() when unpacking results from server-side prepared statements. (Bug #2359)

Reset long binary parameters in ServerPreparedStatement when clearParameters() is called, by sending COM_RESET_STMT to the server. (Bug #2359)

NULL values for numeric types in binary encoded result sets causing NullPointerExceptions. (Bug #2359)

Display where/why a connection was implicitly closed (to aid debugging). (Bug #1673)

DatabaseMetaData.getColumns() is not returning correct column ordinal info for non-'%' column name patterns. (Bug #1673)

Fixed NullPointerException in ServerPreparedStatement.setTimestamp(), as well as year and month discrepencies in ServerPreparedStatement.setTimestamp(), setDate(). (Bug #1673)

Added ability to have multiple database/JVM targets for compliance and regression/unit tests in build.xml. (Bug #1673)

Fixed sending of queries larger than 16M. (Bug #1673)

Merged fix of data type mapping from MySQL type FLOAT to java.sql.Types.REAL from 3.0 branch. (Bug #1673)

Fixed NPE and year/month bad conversions when accessing some datetime functionality in ServerPreparedStatements and their resultant result sets. (Bug #1673)

Added named and indexed input/output parameter support to CallableStatement. MySQL-5.0.x or newer. (Bug #1673)

CommunicationsException implemented, that tries to determine why communications was lost with a server, and displays possible reasons when .getMessage() is called. (Bug #1673)

Detect collation of column for RSMD.isCaseSensitive(). (Bug #1673)

Optimized Buffer.readLenByteArray() to return shared empty byte array when length is 0.

Fix support for table aliases when checking for all primary keys in UpdatableResultSet.

Unpack “unknown” data types from server prepared statements as Strings.

Implemented Statement.getWarnings() for MySQL-4.1 and newer (using SHOW WARNINGS).

Ensure that warnings are cleared before executing queries on prepared statements, as-per JDBC spec (now that we support warnings).

Correctly initialize datasource properties from JNDI Refs, including explicitly specified URLs.

Implemented long data (Blobs, Clobs, InputStreams, Readers) for server prepared statements.

Deal with 0-length tokens in EscapeProcessor (caused by callable statement escape syntax).

DatabaseMetaData now reports supportsStoredProcedures() for MySQL versions >= 5.0.0

Support for mysql_change_user(). See the changeUser() method in com.mysql.jdbc.Connection.

Removed useFastDates connection property.

Support for NIO. Use useNIO=true on platforms that support NIO.

Check for closed connection on delete/update/insert row operations in UpdatableResultSet.

Support for transaction savepoints (MySQL >= 4.0.14 or 4.1.1).

Support “old” profileSql capitalization in ConnectionProperties. This property is deprecated, you should use profileSQL if possible.

Fixed character encoding issues when converting bytes to ASCII when MySQL doesn't provide the character set, and the JVM is set to a multibyte encoding (usually affecting retrieval of numeric values).

Centralized setting of result set type and concurrency.

Fixed bug with UpdatableResultSets not using client-side prepared statements.

Default result set type changed to TYPE_FORWARD_ONLY (JDBC compliance).

Fixed IllegalAccessError to Calendar.getTimeInMillis() in DateTimeValue (for JDK < 1.4).

Allow contents of PreparedStatement.setBlob() to be retained between calls to .execute*().

Fixed stack overflow in Connection.prepareCall() (bad merge).

Refactored how connection properties are set and exposed as DriverPropertyInfo as well as Connection and DataSource properties.

Reduced number of methods called in average query to be more efficient.

Prepared Statements will be re-prepared on auto-reconnect. Any errors encountered are postponed until first attempt to re-execute the re-prepared statement.

Changes in MySQL Connector/J 3.1.0 (2003-02-18, Alpha)

Bugs Fixed

Added useServerPrepStmts property (default false). The driver will use server-side prepared statements when the server version supports them (4.1 and newer) when this property is set to true. It is currently set to false by default until all bind/fetch functionality has been implemented. Currently only DML prepared statements are implemented for 4.1 server-side prepared statements.

Added requireSSL property.

Track open Statements, close all when Connection.close() is called (JDBC compliance).

Changes in MySQL Connector/J 3.0

Changes in MySQL Connector/J 3.0.17 (2005-06-23)

Bugs Fixed

Workaround for server Bug #9098: Default values of CURRENT_* for DATE, TIME, DATETIME, and TIMESTAMP columns can't be distinguished from string values, so UpdatableResultSet.moveToInsertRow() generates bad SQL for inserting default values. (Bug #8812)

NON_UNIQUE column from DBMD.getIndexInfo() returned inverted value. (Bug #8812)

EUCKR charset is sent as SET NAMES euc_kr which MySQL-4.1 and newer doesn't understand. (Bug #8629)

Added support for the EUC_JP_Solaris character encoding, which maps to a MySQL encoding of eucjpms (backported from 3.1 branch). This only works on servers that support eucjpms, namely 5.0.3 or later. (Bug #8629)

Use hex escapes for PreparedStatement.setBytes() for double-byte charsets including “aliases” Windows-31J, CP934, MS932. (Bug #8629)

DatabaseMetaData.supportsSelectForUpdate() returns correct value based on server version. (Bug #8629)

Which requires hex escaping of binary data when using multibyte charsets with prepared statements. (Bug #8064)

Fixed duplicated code in configureClientCharset() that prevented useOldUTF8Behavior=true from working properly. (Bug #7952)

Backported SQLState codes mapping from Connector/J 3.1, enable with useSqlStateCodes=true as a connection property, it defaults to false in this release, so that we don't break legacy applications (it defaults to true starting with Connector/J 3.1). (Bug #7686)

Timestamp key column data needed _binary stripped for UpdatableResultSet.refreshRow(). (Bug #7686)

MS932, SHIFT_JIS, and Windows_31J not recognized as aliases for sjis. (Bug #7607)

Handle streaming result sets with more than 2 billion rows properly by fixing wraparound of row number counter. (Bug #7601)

PreparedStatement.fixDecimalExponent() adding extra +, making number unparseable by MySQL server. (Bug #7601)

Escape sequence {fn convert(..., type)} now supports ODBC-style types that are prepended by SQL_. (Bug #7601)

Statements created from a pooled connection were returning physical connection instead of logical connection when getConnection() was called. (Bug #7316)

Support new protocol type MYSQL_TYPE_VARCHAR. (Bug #7081)

Added useOldUTF8Behavior' configuration property, which causes JDBC driver to act like it did with MySQL-4.0.x and earlier when the character encoding is utf-8 when connected to MySQL-4.1 or newer. (Bug #7081)

DatabaseMetaData.getIndexInfo() ignored unique parameter. (Bug #7081)

PreparedStatement.fixDecimalExponent() adding extra +, making number unparseable by MySQL server. (Bug #7061)

PreparedStatements don't encode Big5 (and other multibyte) character sets correctly in static SQL strings. (Bug #7033)

Connections starting up failed-over (due to down master) never retry master. (Bug #6966)

Adding CP943 to aliases for sjis. (Bug #6549, Bug #7607)

Timestamp/Time conversion goes in the wrong “direction” when useTimeZone=true and server time zone differs from client time zone. (Bug #5874)

Changes in MySQL Connector/J 3.0.16 (2004-11-15)

Bugs Fixed

Made TINYINT(1) -> BIT/Boolean conversion configurable using tinyInt1isBit property (default true to be JDBC compliant out of the box). (Bug #5664)

Off-by-one bug in Buffer.readString(string). (Bug #5664)

ResultSet.updateByte() when on insert row throws ArrayOutOfBoundsException. (Bug #5664)

Fixed regression where useUnbufferedInput was defaulting to false. (Bug #5664)

ResultSet.getTimestamp() on a column with TIME in it fails. (Bug #5664)

Fixed DatabaseMetaData.getTypes() returning incorrect (this is, nonnegative) scale for the NUMERIC type. (Bug #5664)

Only set character_set_results during connection establishment if server version >= 4.1.1. (Bug #5664)

Fixed ResultSetMetaData.isReadOnly() to detect nonwritable columns when connected to MySQL-4.1 or newer, based on existence of “original” table and column names.

Re-issue character set configuration commands when re-using pooled connections or Connection.changeUser() when connected to MySQL-4.1 or newer.

Changes in MySQL Connector/J 3.0.15 (2004-09-04)

Bugs Fixed

ResultSet.getMetaData() should not return incorrectly initialized metadata if the result set has been closed, but should instead throw an SQLException. Also fixed for getRow() and getWarnings() and traversal methods by calling checkClosed() before operating on instance-level fields that are nullified during .close(). (Bug #5069)

Use _binary introducer for PreparedStatement.setBytes() and set*Stream() when connected to MySQL-4.1.x or newer to avoid misinterpretation during character conversion. (Bug #5069)

Parse new time zone variables from 4.1.x servers. (Bug #5069)

ResultSet should release Field[] instance in .close(). (Bug #5022)

RSMD.getPrecision() returning 0 for nonnumeric types (should return max length in chars for nonbinary types, max length in bytes for binary types). This fix also fixes mapping of RSMD.getColumnType() and RSMD.getColumnTypeName() for the BLOB types based on the length sent from the server (the server doesn't distinguish between TINYBLOB, BLOB, MEDIUMBLOB or LONGBLOB at the network protocol level). (Bug #4880)

“Production” is now “GA” (General Availability) in naming scheme of distributions. (Bug #4860, Bug #4138)

DBMD.getColumns() returns incorrect JDBC type for unsigned columns. This affects type mappings for all numeric types in the RSMD.getColumnType() and RSMD.getColumnTypeNames() methods as well, to ensure that “like” types from DBMD.getColumns() match up with what RSMD.getColumnType() and getColumnTypeNames() return. (Bug #4860, Bug #4138)

Calling .close() twice on a PooledConnection causes NPE. (Bug #4808)

DOUBLE mapped twice in DBMD.getTypeInfo(). (Bug #4742)

Added FLOSS license exemption. (Bug #4742)

Removed redundant calls to checkRowPos() in ResultSet. (Bug #4334)

Failover for autoReconnect not using port numbers for any hosts, and not retrying all hosts.

Warning

This required a change to the SocketFactory connect() method signature, which is now public Socket connect(String host, int portNumber, Properties props); therefore, any third-party socket factories will have to be changed to support this signature.

(Bug #4334)

Logical connections created by MysqlConnectionPoolDataSource will now issue a rollback() when they are closed and sent back to the pool. If your application server/connection pool already does this for you, you can set the rollbackOnPooledClose property to false to avoid the overhead of an extra rollback(). (Bug #4334)

StringUtils.escapeEasternUnicodeByteStream was still broken for GBK. (Bug #4010)

Changes in MySQL Connector/J 3.0.14 (2004-05-28)

Bugs Fixed

Fixed URL parsing error.

Changes in MySQL Connector/J 3.0.13 (2004-05-27)

Bugs Fixed

No Database Selected when using MysqlConnectionPoolDataSource. (Bug #3920)

PreparedStatement.getGeneratedKeys() method returns only 1 result for batched insertions. (Bug #3873)

Using a MySQLDatasource without server name fails. (Bug #3848)

Changes in MySQL Connector/J 3.0.12 (2004-05-18)

Bugs Fixed

Inconsistent reporting of data type. The server still doesn't return all types for *BLOBs *TEXT correctly, so the driver won't return those correctly. (Bug #3570)

UpdatableResultSet not picking up default values for moveToInsertRow(). (Bug #3557)

Not specifying database in URL caused MalformedURL exception. (Bug #3554)

Auto-convert MySQL encoding names to Java encoding names if used for characterEncoding property. (Bug #3554)

Use junit.textui.TestRunner for all unit tests (to enable them to be run from the command line outside of Ant or Eclipse). (Bug #3554)

Added encoding names that are recognized on some JVMs to fix case where they were reverse-mapped to MySQL encoding names incorrectly. (Bug #3554)

Made StringRegressionTest 4.1-unicode aware. (Bug #3520)

Fixed regression in PreparedStatement.setString() and eastern character encodings. (Bug #3520)

DBMD.getSQLStateType() returns incorrect value. (Bug #3520)

Renamed StringUtils.escapeSJISByteStream() to more appropriate escapeEasternUnicodeByteStream(). (Bug #3511)

StringUtils.escapeSJISByteStream() not covering all eastern double-byte charsets correctly. (Bug #3511)

Return creating statement for ResultSets created by getGeneratedKeys(). (Bug #2957)

Use SET character_set_results during initialization to enable any charset to be returned to the driver for result sets. (Bug #2670)

Don't truncate BLOB or CLOB values when using setBytes() and setBinary/CharacterStream(). (Bug #2670)

Dynamically configure character set mappings for field-level character sets on MySQL-4.1.0 and newer using SHOW COLLATION when connecting. (Bug #2670)

Map binary character set to US-ASCII to support DATETIME charset recognition for servers >= 4.1.2. (Bug #2670)

Use charsetnr returned during connect to encode queries before issuing SET NAMES on MySQL >= 4.1.0. (Bug #2670)

Add helper methods to ResultSetMetaData (getColumnCharacterEncoding() and getColumnCharacterSet()) to permit end users to see what charset the driver thinks it should be using for the column. (Bug #2670)

Only set character_set_results for MySQL >= 4.1.0. (Bug #2670)

Allow url parameter for MysqlDataSource and MysqlConnectionPool DataSource so that passing of other properties is possible from inside appservers.

Don't escape SJIS/GBK/BIG5 when using MySQL-4.1 or newer.

Backport documentation tooling from 3.1 branch.

Added failOverReadOnly property, to enable the user to configure the state of the connection (read-only/writable) when failed over.

Add unsigned attribute to DatabaseMetaData.getColumns() output in the TYPE_NAME column.

Map duplicate key and foreign key errors to SQLState of 23000.

Backported “change user” and “reset server state” functionality from 3.1 branch, to enable clients of MysqlConnectionPoolDataSource to reset server state on getConnection() on a pooled connection.

Allow java.util.Date to be sent in as parameter to PreparedStatement.setObject(), converting it to a Timestamp to maintain full precision. . (Bug #103)

Changes in MySQL Connector/J 3.0.11 (2004-02-19)

Bugs Fixed

Return java.lang.Double for FLOAT type from ResultSetMetaData.getColumnClassName(). (Bug #2855)

Return [B instead of java.lang.Object for BINARY, VARBINARY and LONGVARBINARY types from ResultSetMetaData.getColumnClassName() (JDBC compliance). (Bug #2855)

Issue connection events on all instances created from a ConnectionPoolDataSource. (Bug #2855)

Return java.lang.Integer for TINYINT and SMALLINT types from ResultSetMetaData.getColumnClassName(). (Bug #2852)

Added useUnbufferedInput parameter, and now use it by default (due to JVM issue http://developer.java.sun.com/developer/bugParade/bugs/4401235.html) (Bug #2578)

Fixed failover always going to last host in list. (Bug #2578)

Detect on/off or 1, 2, 3 form of lower_case_table_names value on server. (Bug #2578)

AutoReconnect time was growing faster than exponentially. (Bug #2447)

Trigger a SET NAMES utf8 when encoding is forced to utf8 or utf-8 using the characterEncoding property. Previously, only the Java-style encoding name of utf-8 would trigger this.

Changes in MySQL Connector/J 3.0.10 (2004-01-13)

Bugs Fixed

Enable caching of the parsing stage of prepared statements using the cachePrepStmts, prepStmtCacheSize, and prepStmtCacheSqlLimit properties (disabled by default). (Bug #2006)

Fixed security exception when used in Applets (applets can't read the system property file.encoding which is needed for LOAD DATA LOCAL INFILE). (Bug #2006)

Speed up parsing of PreparedStatements, try to use one-pass whenever possible. (Bug #2006)

Fixed exception Unknown character set 'danish' on connect with JDK-1.4.0 (Bug #2006)

Fixed mappings in SQLError to report deadlocks with SQLStates of 41000. (Bug #2006)

Removed static synchronization bottleneck from instance factory method of SingleByteCharsetConverter. (Bug #2006)

Removed static synchronization bottleneck from PreparedStatement.setTimestamp(). (Bug #2006)

ResultSet.findColumn() should use first matching column name when there are duplicate column names in SELECT query (JDBC-compliance). (Bug #2006)

maxRows property would affect internal statements, so check it for all statement creation internal to the driver, and set to 0 when it is not. (Bug #2006)

Use constants for SQLStates. (Bug #2006)

Map charset ko18_ru to ko18r when connected to MySQL-4.1.0 or newer. (Bug #2006)

Ensure that Buffer.writeString() saves room for the \0. (Bug #2006)

ArrayIndexOutOfBounds when parameter number == number of parameters + 1. (Bug #1958)

Connection property maxRows not honored. (Bug #1933)

Statements being created too many times in DBMD.extractForeignKeyFromCreateTable(). (Bug #1925)

Support escape sequence {fn convert ... }. (Bug #1914)

Implement ResultSet.updateClob(). (Bug #1913)

Autoreconnect code didn't set catalog upon reconnect if it had been changed. (Bug #1913)

ResultSet.getObject() on TINYINT and SMALLINT columns should return Java type Integer. (Bug #1913)

Added more descriptive error message Server Configuration Denies Access to DataSource, as well as retrieval of message from server. (Bug #1913)

ResultSetMetaData.isCaseSensitive() returned wrong value for CHAR/VARCHAR columns. (Bug #1913)

Added alwaysClearStream connection property, which causes the driver to always empty any remaining data on the input stream before each query. (Bug #1913)

DatabaseMetaData.getSystemFunction() returning bad function VResultsSion. (Bug #1775)

Foreign Keys column sequence is not consistent in DatabaseMetaData.getImported/Exported/CrossReference(). (Bug #1731)

Fix for ArrayIndexOutOfBounds exception when using Statement.setMaxRows(). (Bug #1695)

Subsequent call to ResultSet.updateFoo() causes NPE if result set is not updatable. (Bug #1630)

Fix for 4.1.1-style authentication with no password. (Bug #1630)

Cross-database updatable result sets are not checked for updatability correctly. (Bug #1592)

DatabaseMetaData.getColumns() should return Types.LONGVARCHAR for MySQL LONGTEXT type. (Bug #1592)

Fixed regression of Statement.getGeneratedKeys() and REPLACE statements. (Bug #1576)

Barge blobs and split packets not being read correctly. (Bug #1576)

Backported fix for aliased tables and UpdatableResultSets in checkUpdatability() method from 3.1 branch. (Bug #1534)

“Friendlier” exception message for PacketTooLargeException. (Bug #1534)

Don't count quoted IDs when inside a 'string' in PreparedStatement parsing. (Bug #1511)

Changes in MySQL Connector/J 3.0.9 (2003-10-07)

Bugs Fixed

ResultSet.get/setString mashing char 127. (Bug #1247)

Added property to “clobber” streaming results, by setting the clobberStreamingResults property to true (the default is false). This will cause a “streaming” ResultSet to be automatically closed, and any outstanding data still streaming from the server to be discarded if another query is executed before all the data has been read from the server. (Bug #1247)

Added com.mysql.jdbc.util.BaseBugReport to help creation of testcases for bug reports. (Bug #1247)

Backported authentication changes for 4.1.1 and newer from 3.1 branch. (Bug #1247)

Made databaseName, portNumber, and serverName optional parameters for MysqlDataSourceFactory. (Bug #1246)

Optimized CLOB.setChracterStream(). (Bug #1131)

Fixed CLOB.truncate(). (Bug #1130)

Faster date handling code in ResultSet and PreparedStatement (no longer uses Date methods that synchronize on static calendars).

Fixed deadlock issue with Statement.setMaxRows(). (Bug #1099)

DatabaseMetaData.getColumns() getting confused about the keyword “set” in character columns. (Bug #1099)

Clip +/- INF (to smallest and largest representative values for the type in MySQL) and NaN (to 0) for setDouble/setFloat(), and issue a warning on the statement when the server does not support +/- INF or NaN. (Bug #884)

Don't fire connection closed events when closing pooled connections, or on PooledConnection.getConnection() with already open connections. (Bug #884)

Double-escaping of '\' when charset is SJIS or GBK and '\' appears in nonescaped input. (Bug #879)

When emptying input stream of unused rows for “streaming” result sets, have the current thread yield() every 100 rows to not monopolize CPU time. (Bug #879)

Issue exception on ResultSet.getXXX() on empty result set (wasn't caught in some cases). (Bug #848)

Don't hide messages from exceptions thrown in I/O layers. (Bug #848)

Fixed regression in large split-packet handling. (Bug #848)

Better diagnostic error messages in exceptions for “streaming” result sets. (Bug #848)

Don't change timestamp TZ twice if useTimezone==true. (Bug #774)

Fixed test for end of buffer in Buffer.readString().

Don't wrap SQLExceptions in RowDataDynamic. (Bug #688)

Don't try and reset isolation level on reconnect if MySQL doesn't support them. (Bug #688)

The insertRow in an UpdatableResultSet is now loaded with the default column values when moveToInsertRow() is called. (Bug #688)

DatabaseMetaData.getColumns() wasn't returning NULL for default values that are specified as NULL. (Bug #688)

Change default statement type/concurrency to TYPE_FORWARD_ONLY and CONCUR_READ_ONLY (spec compliance). (Bug #688)

Fix UpdatableResultSet to return values for getXXX() when on insert row. (Bug #675)

Support InnoDB constraint names when extracting foreign key information in DatabaseMetaData (implementing ideas from Parwinder Sekhon). (Bug #664, Bug #517)

Backported 4.1 protocol changes from 3.1 branch (server-side SQL states, new field information, larger client capability flags, connect-with-database, and so forth). (Bug #664, Bug #517)

refreshRow didn't work when primary key values contained values that needed to be escaped (they ended up being doubly escaped). (Bug #661)

Fixed ResultSet.previous() behavior to move current position to before result set when on first row of result set. (Bug #496)

Fixed Statement and PreparedStatement issuing bogus queries when setMaxRows() had been used and a LIMIT clause was present in the query. (Bug #496)

Changes in MySQL Connector/J 3.0.8 (2003-05-23)

Bugs Fixed

Use JVM charset with file names and LOAD DATA [LOCAL] INFILE.

Fix infinite loop with Connection.cleanup().

Changed Ant target compile-core to compile-driver, and made testsuite compilation a separate target.

Fixed result set not getting set for Statement.executeUpdate(), which affected getGeneratedKeys() and getUpdateCount() in some cases.

Return list of generated keys when using multi-value INSERTS with Statement.getGeneratedKeys().

Fixed SJIS encoding bug, thanks to Naoto Sato. (Bug #378)

Fix problem detecting server character set in some cases. (Bug #378)

Allow multiple calls to Statement.close(). (Bug #378)

Return correct number of generated keys when using REPLACE statements. (Bug #378)

Unicode character 0xFFFF in a string would cause the driver to throw an ArrayOutOfBoundsException. . (Bug #378)

Fix row data decoding error when using very large packets. (Bug #378)

Optimized row data decoding. (Bug #378)

Issue exception when operating on an already closed prepared statement. (Bug #378)

Optimized usage of EscapeProcessor. (Bug #378)

Allow bogus URLs in Driver.getPropertyInfo().

Changes in MySQL Connector/J 3.0.7 (2003-04-08)

Bugs Fixed

Fixed charset issues with database metadata (charset was not getting set correctly).

You can now toggle profiling on/off using Connection.setProfileSql(boolean).

4.1 Column Metadata fixes.

Fixed MysqlPooledConnection.close() calling wrong event type.

Fixed StringIndexOutOfBoundsException in PreparedStatement.setClob().

IOExceptions during a transaction now cause the Connection to be closed.

Remove synchronization from Driver.connect() and Driver.acceptsUrl().

Fixed missing conversion for YEAR type in ResultSetMetaData.getColumnTypeName().

Updatable ResultSets can now be created for aliased tables/columns when connected to MySQL-4.1 or newer.

Fixed LOAD DATA LOCAL INFILE bug when file > max_allowed_packet.

Don't pick up indexes that start with pri as primary keys for DBMD.getPrimaryKeys().

Ensure that packet size from alignPacketSize() does not exceed max_allowed_packet (JVM bug)

Don't reset Connection.isReadOnly() when autoReconnecting.

Fixed escaping of 0x5c ('\') character for GBK and Big5 charsets.

Fixed ResultSet.getTimestamp() when underlying field is of type DATE.

Throw SQLExceptions when trying to do operations on a forcefully closed Connection (that is, when a communication link failure occurs).

Changes in MySQL Connector/J 3.0.6 (2003-02-18)

Bugs Fixed

Backported 4.1 charset field info changes from Connector/J 3.1.

Fixed Statement.setMaxRows() to stop sending LIMIT type queries when not needed (performance).

Fixed DBMD.getTypeInfo() and DBMD.getColumns() returning different value for precision in TEXT and BLOB types.

Fixed SQLExceptions getting swallowed on initial connect.

Fixed ResultSetMetaData to return "" when catalog not known. Fixes NullPointerExceptions with Sun's CachedRowSet.

Allow ignoring of warning for “non transactional tables” during rollback (compliance/usability) by setting ignoreNonTxTables property to true.

Clean up Statement query/method mismatch tests (that is, INSERT not permitted with .executeQuery()).

Fixed ResultSetMetaData.isWritable() to return correct value.

More checks added in ResultSet traversal method to catch when in closed state.

Implemented Blob.setBytes(). You still need to pass the resultant Blob back into an updatable ResultSet or PreparedStatement to persist the changes, because MySQL does not support “locators”.

Add “window” of different NULL sorting behavior to DBMD.nullsAreSortedAtStart (4.0.2 to 4.0.10, true; otherwise, no).

Changes in MySQL Connector/J 3.0.5 (2003-01-22)

Bugs Fixed

Fixed ResultSet.isBeforeFirst() for empty result sets.

Added missing LONGTEXT type to DBMD.getColumns().

Implemented an empty TypeMap for Connection.getTypeMap() so that some third-party apps work with MySQL (IBM WebSphere 5.0 Connection pool).

Added update options for foreign key metadata.

Fixed Buffer.fastSkipLenString() causing ArrayIndexOutOfBounds exceptions with some queries when unpacking fields.

Quote table names in DatabaseMetaData.getColumns(), getPrimaryKeys(), getIndexInfo(), getBestRowIdentifier().

Retrieve TX_ISOLATION from database for Connection.getTransactionIsolation() when the MySQL version supports it, instead of an instance variable.

Greatly reduce memory required for setBinaryStream() in PreparedStatements.

Changes in MySQL Connector/J 3.0.4 (2003-01-06)

Bugs Fixed

Streamlined character conversion and byte[] handling in PreparedStatements for setByte().

Fixed PreparedStatement.executeBatch() parameter overwriting.

Added quoted identifiers to database names for Connection.setCatalog.

Added support for 4.0.8-style large packets.

Reduce memory footprint of PreparedStatements by sharing outbound packet with MysqlIO.

Added strictUpdates property to enable control of amount of checking for “correctness” of updatable result sets. Set this to false if you want faster updatable result sets and you know that you create them from SELECT statements on tables with primary keys and that you have selected all primary keys in your query.

Added support for quoted identifiers in PreparedStatement parser.

Changes in MySQL Connector/J 3.0.3 (2002-12-17)

Bugs Fixed

Allow user to alter behavior of Statement/ PreparedStatement.executeBatch() using continueBatchOnError property (defaults to true).

More robust escape tokenizer: Recognize -- comments, and permit nested escape sequences (see testsuite.EscapeProcessingTest).

Fixed Buffer.isLastDataPacket() for 4.1 and newer servers.

NamedPipeSocketFactory now works (only intended for Windows), see README for instructions.

Changed charsToByte in SingleByteCharConverter to be nonstatic.

Use nonaliased table/column names and database names to fully qualify tables and columns in UpdatableResultSet (requires MySQL-4.1 or newer).

LOAD DATA LOCAL INFILE ... now works, if your server is configured to permit it. Can be turned off with the allowLoadLocalInfile property (see the README).

Implemented Connection.nativeSQL().

Fixed ResultSetMetaData.getColumnTypeName() returning BLOB for TEXT and TEXT for BLOB types.

Fixed charset handling in Fields.java.

Because of above, implemented ResultSetMetaData.isAutoIncrement() to use Field.isAutoIncrement().

Substitute '?' for unknown character conversions in single-byte character sets instead of '\0'.

Added CLIENT_LONG_FLAG to be able to get more column flags (isAutoIncrement() being the most important).

Honor lower_case_table_names when enabled in the server when doing table name comparisons in DatabaseMetaData methods.

DBMD.getImported/ExportedKeys() now handles multiple foreign keys per table.

More robust implementation of updatable result sets. Checks that all primary keys of the table have been selected.

Some MySQL-4.1 protocol support (extended field info from selects).

Check for connection closed in more Connection methods (createStatement, prepareStatement, setTransactionIsolation, setAutoCommit).

Fixed ResultSetMetaData.getPrecision() returning incorrect values for some floating-point types.

Changed SingleByteCharConverter to use lazy initialization of each converter.

Changes in MySQL Connector/J 3.0.2 (2002-11-08)

Bugs Fixed

Implemented Clob.setString().

Added com.mysql.jdbc.MiniAdmin class, which enables you to send shutdown command to MySQL server. This is intended to be used when “embedding” Java and MySQL server together in an end-user application.

Added SSL support. See README for information on how to use it.

All DBMD result set columns describing schemas now return NULL to be more compliant with the behavior of other JDBC drivers for other database systems (MySQL does not support schemas).

Use SHOW CREATE TABLE when possible for determining foreign key information for DatabaseMetaData. Also enables cascade options for DELETE information to be returned.

Implemented Clob.setCharacterStream().

Failover and autoReconnect work only when the connection is in an autoCommit(false) state, to stay transaction-safe.

Fixed DBMD.supportsResultSetConcurrency() so that it returns true for ResultSet.TYPE_SCROLL_INSENSITIVE and ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE.

Implemented Clob.setAsciiStream().

Removed duplicate code from UpdatableResultSet (it can be inherited from ResultSet, the extra code for each method to handle updatability I thought might someday be necessary has not been needed).

Fixed UnsupportedEncodingException thrown when “forcing” a character encoding using properties.

Fixed incorrect conversion in ResultSet.getLong().

Implemented ResultSet.updateBlob().

Removed some not-needed temporary object creation by smarter use of Strings in EscapeProcessor, Connection and DatabaseMetaData classes.

Escape 0x5c character in strings for the SJIS charset.

PreparedStatement now honors stream lengths in setBinary/Ascii/Character Stream() unless you set the connection property useStreamLengthsInPrepStmts to false.

Fixed issue with updatable result sets and PreparedStatements not working.

Fixed start position off-by-1 error in Clob.getSubString().

Added connectTimeout parameter that enables users of JDK-1.4 and newer to specify a maximum time to wait to establish a connection.

Fixed various non-ASCII character encoding issues.

Fixed ResultSet.isLast() for empty result sets (should return false).

Added driver property useHostsInPrivileges. Defaults to true. Affects whether or not @hostname will be used in DBMD.getColumn/TablePrivileges.

Fixed ResultSet.setFetchDirection(FETCH_UNKNOWN).

Added queriesBeforeRetryMaster property that specifies how many queries to issue when failed over before attempting to reconnect to the master (defaults to 50).

Fixed issue when calling Statement.setFetchSize() when using arbitrary values.

Properly restore connection properties when autoReconnecting or failing-over, including autoCommit state, and isolation level.

Implemented Clob.truncate().

Changes in MySQL Connector/J 3.0.1 (2002-09-21)

Bugs Fixed

Charsets now automatically detected. Optimized code for single-byte character set conversion.

Fixed ResultSetMetaData.isSigned() for TINYINT and BIGINT.

Fixed RowDataStatic.getAt() off-by-one bug.

Fixed ResultSet.getRow() off-by-one bug.

Massive code clean-up to follow Java coding conventions (the time had come).

Implemented ResultSet.getCharacterStream().

Added limited Clob functionality (ResultSet.getClob(), PreparedStatement.setClob(), PreparedStatement.setObject(Clob).

Connection.isClosed() no longer “pings” the server.

Connection.close() issues rollback() when getAutoCommit() is false.

Added socketTimeout parameter to URL.

Added LOCAL TEMPORARY to table types in DatabaseMetaData.getTableTypes().

Added paranoid parameter, which sanitizes error messages by removing “sensitive” information from them (such as host names, ports, or user names), as well as clearing “sensitive” data structures when possible.

Changes in MySQL Connector/J 3.0.0 (2002-07-31)

Bugs Fixed

General source-code cleanup.

The driver now only works with JDK-1.2 or newer.

Fix and sort primary key names in DBMetaData (SF bugs 582086 and 582086).

ResultSet.getTimestamp() now works for DATE types (SF bug 559134).

Float types now reported as java.sql.Types.FLOAT (SF bug 579573).

Support for streaming (row-by-row) result sets (see README) Thanks to Doron.

Testsuite now uses Junit (which you can get from http://www.junit.org.

JDBC Compliance: Passes all tests besides stored procedure tests.

ResultSet.getDate/Time/Timestamp now recognizes all forms of invalid values that have been set to all zeros by MySQL (SF bug 586058).

Added multi-host failover support (see README).

Repackaging: New driver name is com.mysql.jdbc.Driver, old name still works, though (the driver is now provided by MySQL-AB).

Support for large packets (new addition to MySQL-4.0 protocol), see README for more information.

Better checking for closed connections in Statement and PreparedStatement.

Performance improvements in string handling and field metadata creation (lazily instantiated) contributed by Alex Twisleton-Wykeham-Fiennes.

JDBC-3.0 functionality including Statement/PreparedStatement.getGeneratedKeys() and ResultSet.getURL().

Overall speed improvements using controlling transient object creation in MysqlIO class when reading packets.

!!! LICENSE CHANGE !!! The driver is now GPL.

Performance enhancements: Driver is now 50–100% faster in most situations, and creates fewer temporary objects.

Changes in MySQL Connector/J 2.0

Changes in MySQL Connector/J 2.0.14 (2002-05-16)

Bugs Fixed

ResultSet.getDouble() now uses code built into JDK to be more precise (but slower).

Fixed typo for relaxAutoCommit parameter.

LogicalHandle.isClosed() calls through to physical connection.

Added SQL profiling (to STDERR). Set profileSql=true in your JDBC URL. See README for more information.

PreparedStatement now releases resources on .close(). (SF bug 553268)

More code cleanup.

Quoted identifiers not used if server version does not support them. Also, if server started with --ansi or --sql-mode=ANSI_QUOTES, “"” will be used as an identifier quote character, otherwise “'” will be used.

Changes in MySQL Connector/J 2.0.13 (2002-04-24)

Bugs Fixed

Fixed unicode chars being read incorrectly. (SF bug 541088)

Faster blob escaping for PrepStmt.

Added setURL() to MySQLXADataSource. (SF bug 546019)

Added set/getPortNumber() to DataSource(s). (SF bug 548167)

PreparedStatement.toString() fixed. (SF bug 534026)

More code cleanup.

Rudimentary version of Statement.getGeneratedKeys() from JDBC-3.0 now implemented (you need to be using JDK-1.4 for this to work, I believe).

DBMetaData.getIndexInfo() - bad PAGES fixed. (SF BUG 542201)

ResultSetMetaData.getColumnClassName() now implemented.

Changes in MySQL Connector/J 2.0.12 (2002-04-07)

Bugs Fixed

Fixed testsuite.Traversal afterLast() bug, thanks to Igor Lastric.

Added new types to getTypeInfo(), fixed existing types thanks to Al Davis and Kid Kalanon.

Fixed time zone off-by-1-hour bug in PreparedStatement (538286, 528785).

Added identifier quoting to all DatabaseMetaData methods that need them (should fix 518108).

Added support for BIT types (51870) to PreparedStatement.

ResultSet.insertRow() should now detect auto_increment fields in most cases and use that value in the new row. This detection will not work in multi-valued keys, however, due to the fact that the MySQL protocol does not return this information.

Relaxed synchronization in all classes, should fix 520615 and 520393.

DataSources - fixed setUrl bug (511614, 525565), wrong datasource class name (532816, 528767).

Added support for YEAR type (533556).

Fixes for ResultSet updatability in PreparedStatement.

ResultSet: Fixed updatability (values being set to null if not updated).

Added getTable/ColumnPrivileges() to DBMD (fixes 484502).

Added getIdleFor() method to Connection and MysqlLogicalHandle.

ResultSet.refreshRow() implemented.

Fixed getRow() bug (527165) in ResultSet.

General code cleanup.

Changes in MySQL Connector/J 2.0.11 (2002-01-27)

Bugs Fixed

Full synchronization of Statement.java.

Fixed missing DELETE_RULE value in DBMD.getImported/ExportedKeys() and getCrossReference().

More changes to fix Unexpected end of input stream errors when reading BLOB values. This should be the last fix.

Changes in MySQL Connector/J 2.0.10 (2002-01-24)

Bugs Fixed

Fixed null-pointer-exceptions when using MysqlConnectionPoolDataSource with Websphere 4 (bug 505839).

Fixed spurious Unexpected end of input stream errors in MysqlIO (bug 507456).

Changes in MySQL Connector/J 2.0.9 (2002-01-13)

Bugs Fixed

Fixed extra memory allocation in MysqlIO.readPacket() (bug 488663).

Added detection of network connection being closed when reading packets (thanks to Todd Lizambri).

Fixed casting bug in PreparedStatement (bug 488663).

DataSource implementations moved to org.gjt.mm.mysql.jdbc2.optional package, and (initial) implementations of PooledConnectionDataSource and XADataSource are in place (thanks to Todd Wolff for the implementation and testing of PooledConnectionDataSource with IBM WebSphere 4).

Fixed quoting error with escape processor (bug 486265).

Removed concatenation support from driver (the || operator), as older versions of VisualAge seem to be the only thing that use it, and it conflicts with the logical || operator. You will need to start mysqld with the --ansi flag to use the || operator as concatenation (bug 491680).

Ant build was corrupting included jar files, fixed (bug 487669).

Report batch update support through DatabaseMetaData (bug 495101).

Implementation of DatabaseMetaData.getExported/ImportedKeys() and getCrossReference().

Fixed off-by-one-hour error in PreparedStatement.setTimestamp() (bug 491577).

Full synchronization on methods modifying instance and class-shared references, driver should be entirely thread-safe now (please let me know if you have problems).

Changes in MySQL Connector/J 2.0.8 (2001-11-25)

Bugs Fixed

XADataSource/ConnectionPoolDataSource code (experimental)

DatabaseMetaData.getPrimaryKeys() and getBestRowIdentifier() are now more robust in identifying primary keys (matches regardless of case or abbreviation/full spelling of Primary Key in Key_type column).

Batch updates now supported (thanks to some inspiration from Daniel Rall).

PreparedStatement.setAnyNumericType() now handles positive exponents correctly (adds + so MySQL can understand it).

Changes in MySQL Connector/J 2.0.7 (2001-10-24)

Bugs Fixed

Character sets read from database if useUnicode=true and characterEncoding is not set. (thanks to Dmitry Vereshchagin)

Initial transaction isolation level read from database (if available). (thanks to Dmitry Vereshchagin)

Fixed PreparedStatement generating SQL that would end up with syntax errors for some queries.

PreparedStatement.setCharacterStream() now implemented

Capitalize type names when capitalizeTypeNames=true is passed in URL or properties (for WebObjects. (thanks to Anjo Krank)

ResultSet.getBlob() now returns null if column value was null.

Fixed ResultSetMetaData.getPrecision() returning one less than actual on newer versions of MySQL.

Fixed dangling socket problem when in high availability (autoReconnect=true) mode, and finalizer for Connection will close any dangling sockets on GC.

Fixed time zone issue in PreparedStatement.setTimestamp(). (thanks to Erik Olofsson)

PreparedStatement.setDouble() now uses full-precision doubles (reverting a fix made earlier to truncate them).

Fixed DatabaseMetaData.supportsTransactions(), and supportsTransactionIsolationLevel() and getTypeInfo() SQL_DATETIME_SUB and SQL_DATA_TYPE fields not being readable.

Updatable result sets now correctly handle NULL values in fields.

PreparedStatement.setBoolean() will use 1/0 for values if your MySQL version is 3.21.23 or higher.

Fixed ResultSet.isAfterLast() always returning false.

Changes in MySQL Connector/J 2.0.6 (2001-06-16)

Bugs Fixed

Fixed PreparedStatement parameter checking.

Fixed case-sensitive column names in ResultSet.java.

Changes in MySQL Connector/J 2.0.5 (2001-06-13)

Bugs Fixed

ResultSet.insertRow() works now, even if not all columns are set (they will be set to NULL).

Added Byte to PreparedStatement.setObject().

Fixed data parsing of TIMESTAMP values with 2-digit years.

Added ISOLATION level support to Connection.setIsolationLevel()

DataBaseMetaData.getCrossReference() no longer ArrayIndexOOB.

ResultSet.getBoolean() now recognizes -1 as true.

ResultSet has +/-Inf/inf support.

getObject() on ResultSet correctly does TINYINT->Byte and SMALLINT->Short.

Fixed ResultSetMetaData.getColumnTypeName for TEXT/BLOB.

Fixed ArrayIndexOutOfBounds when sending large BLOB queries. (Max size packet was not being set)

Fixed NPE on PreparedStatement.executeUpdate() when all columns have not been set.

Fixed ResultSet.getBlob() ArrayIndex out-of-bounds.

Changes in MySQL Connector/J 2.0.3 (2000-12-03)

Bugs Fixed

Fixed composite key problem with updatable result sets.

Faster ASCII string operations.

Fixed off-by-one error in java.sql.Blob implementation code.

Fixed incorrect detection of MAX_ALLOWED_PACKET, so sending large blobs should work now.

Added detection of -/+INF for doubles.

Added ultraDevHack URL parameter, set to true to enable (broken) Macromedia UltraDev to use the driver.

Implemented getBigDecimal() without scale component for JDBC2.

Changes in MySQL Connector/J 2.0.1 (2000-04-06)

Bugs Fixed

Columns that are of type TEXT now return as Strings when you use getObject().

Cleaned up exception handling when driver connects.

Fixed RSMD.isWritable() returning wrong value. Thanks to Moritz Maass.

DatabaseMetaData.getPrimaryKeys() now works correctly with respect to key_seq. Thanks to Brian Slesinsky.

Fixed many JDBC-2.0 traversal, positioning bugs, especially with respect to empty result sets. Thanks to Ron Smits, Nick Brook, Cessar Garcia and Carlos Martinez.

No escape processing is done on PreparedStatements anymore per JDBC spec.

Fixed some issues with updatability support in ResultSet when using multiple primary keys.

Changes in MySQL Connector/J 2.0.0pre5 (21 February 2000)

Fixed Bad Handshake problem.

Changes in MySQL Connector/J 2.0.0pre4 (10 January 2000)

Fixes to ResultSet for insertRow() - Thanks to Cesar Garcia

Fix to Driver to recognize JDBC-2.0 by loading a JDBC-2.0 class, instead of relying on JDK version numbers. Thanks to John Baker.

Fixed ResultSet to return correct row numbers

Statement.getUpdateCount() now returns rows matched, instead of rows actually updated, which is more SQL-92 like.

10-29-99

Statement/PreparedStatement.getMoreResults() bug fixed. Thanks to Noel J. Bergman.

Added Short as a type to PreparedStatement.setObject(). Thanks to Jeff Crowder

Driver now automagically configures maximum/preferred packet sizes by querying server.

Autoreconnect code uses fast ping command if server supports it.

Fixed various bugs with respect to packet sizing when reading from the server and when alloc'ing to write to the server.

Changes in MySQL Connector/J 2.0.0pre (17 August 1999)

Now compiles under JDK-1.2. The driver supports both JDK-1.1 and JDK-1.2 at the same time through a core set of classes. The driver will load the appropriate interface classes at runtime by figuring out which JVM version you are using.

Fixes for result sets with all nulls in the first row. (Pointed out by Tim Endres)

Fixes to column numbers in SQLExceptions in ResultSet (Thanks to Blas Rodriguez Somoza)

The database no longer needs to specified to connect. (Thanks to Christian Motschke)

Changes in MySQL Connector/J 1.2 and lower

Changes in MySQL Connector/J 1.2b (04 July 1999)

Better Documentation (in progress), in doc/mm.doc/book1.html

DBMD now permits null for a column name pattern (not in spec), which it changes to '%'.

DBMD now has correct types/lengths for getXXX().

ResultSet.getDate(), getTime(), and getTimestamp() fixes. (contributed by Alan Wilken)

EscapeProcessor now handles \{ \} and { or } inside quotation marks correctly. (thanks to Alik for some ideas on how to fix it)

Fixes to properties handling in Connection. (contributed by Juho Tikkala)

ResultSet.getObject() now returns null for NULL columns in the table, rather than bombing out. (thanks to Ben Grosman)

ResultSet.getObject() now returns Strings for types from MySQL that it doesn't know about. (Suggested by Chris Perdue)

Removed DataInput/Output streams, not needed, 1/2 number of method calls per IO operation.

Use default character encoding if one is not specified. This is a work-around for broken JVMs, because according to spec, EVERY JVM must support "ISO8859_1", but they do not.

Fixed Connection to use the platform character encoding instead of "ISO8859_1" if one isn't explicitly set. This fixes problems people were having loading the character- converter classes that didn't always exist (JVM bug). (thanks to Fritz Elfert for pointing out this problem)

Changed MysqlIO to re-use packets where possible to reduce memory usage.

Fixed escape-processor bugs pertaining to {} inside quotation marks.

Changes in MySQL Connector/J 1.2a (14 April 1999)

Fixed character-set support for non-Javasoft JVMs (thanks to many people for pointing it out)

Fixed ResultSet.getBoolean() to recognize 'y' & 'n' as well as '1' & '0' as boolean flags. (thanks to Tim Pizey)

Fixed ResultSet.getTimestamp() to give better performance. (thanks to Richard Swift)

Fixed getByte() for numeric types. (thanks to Ray Bellis)

Fixed DatabaseMetaData.getTypeInfo() for DATE type. (thanks to Paul Johnston)

Fixed EscapeProcessor for "fn" calls. (thanks to Piyush Shah at locomotive.org)

Fixed EscapeProcessor to not do extraneous work if there are no escape codes. (thanks to Ryan Gustafson)

Fixed Driver to parse URLs of the form "jdbc:mysql://host:port" (thanks to Richard Lobb)

Changes in MySQL Connector/J 1.1i (24 March 1999)

Fixed Timestamps for PreparedStatements

Fixed null pointer exceptions in RSMD and RS

Re-compiled with jikes for valid class files (thanks ms!)

Changes in MySQL Connector/J 1.1h (08 March 1999)

Fixed escape processor to deal with unmatched { and } (thanks to Craig Coles)

Fixed escape processor to create more portable (between DATETIME and TIMESTAMP types) representations so that it will work with BETWEEN clauses. (thanks to Craig Longman)

MysqlIO.quit() now closes the socket connection. Before, after many failed connections some OS's would run out of file descriptors. (thanks to Michael Brinkman)

Fixed NullPointerException in Driver.getPropertyInfo. (thanks to Dave Potts)

Fixes to MysqlDefs to allow all *text fields to be retrieved as Strings. (thanks to Chris at Leverage)

Fixed setDouble in PreparedStatement for large numbers to avoid sending scientific notation to the database. (thanks to J.S. Ferguson)

Fixed getScale() and getPrecision() in RSMD. (contrib'd by James Klicman)

Fixed getObject() when field was DECIMAL or NUMERIC (thanks to Bert Hobbs)

DBMD.getTables() bombed when passed a null table-name pattern. Fixed. (thanks to Richard Lobb)

Added check for "client not authorized" errors during connect. (thanks to Hannes Wallnoefer)

Changes in MySQL Connector/J 1.1g (19 February 1999)

Result set rows are now byte arrays. Blobs and Unicode work bidirectonally now. The useUnicode and encoding options are implemented now.

Fixes to PreparedStatement to send binary set by setXXXStream to be sent untouched to the MySQL server.

Fixes to getDriverPropertyInfo().

Changes in MySQL Connector/J 1.1f (31 December 1998)

Changed all ResultSet fields to Strings, this should allow Unicode to work, but your JVM must be able to convert between the character sets. This should also make reading data from the server be a bit quicker, because there is now no conversion from StringBuffer to String.

Changed PreparedStatement.streamToString() to be more efficient (code from Uwe Schaefer).

URL parsing is more robust (throws SQL exceptions on errors rather than NullPointerExceptions)

PreparedStatement now can convert Strings to Time/Date values using setObject() (code from Robert Currey).

IO no longer hangs in Buffer.readInt(), that bug was introduced in 1.1d when changing to all byte-arrays for result sets. (Pointed out by Samo Login)

Changes in MySQL Connector/J 1.1b (03 November 1998)

Fixes to DatabaseMetaData to allow both IBM VA and J-Builder to work. Let me know how it goes. (thanks to Jac Kersing)

Fix to ResultSet.getBoolean() for NULL strings (thanks to Barry Lagerweij)

Beginning of code cleanup, and formatting. Getting ready to branch this off to a parallel JDBC-2.0 source tree.

Added "final" modifier to critical sections in MysqlIO and Buffer to allow compiler to inline methods for speed.

9-29-98

If object references passed to setXXX() in PreparedStatement are null, setNull() is automatically called for you. (Thanks for the suggestion goes to Erik Ostrom)

setObject() in PreparedStatement will now attempt to write a serialized representation of the object to the database for objects of Types.OTHER and objects of unknown type.

Util now has a static method readObject() which given a ResultSet and a column index will re-instantiate an object serialized in the above manner.

Changes in MySQL Connector/J 1.1 (02 September 1998)

Got rid of "ugly hack" in MysqlIO.nextRow(). Rather than catch an exception, Buffer.isLastDataPacket() was fixed.

Connection.getCatalog() and Connection.setCatalog() should work now.

Statement.setMaxRows() works, as well as setting by property maxRows. Statement.setMaxRows() overrides maxRows set using properties or url parameters.

Automatic re-connection is available. Because it has to "ping" the database before each query, it is turned off by default. To use it, pass in "autoReconnect=true" in the connection URL. You may also change the number of reconnect tries, and the initial timeout value using "maxReconnects=n" (default 3) and "initialTimeout=n" (seconds, default 2) parameters. The timeout is an exponential backoff type of timeout; for example, if you have initial timeout of 2 seconds, and maxReconnects of 3, then the driver will timeout 2 seconds, 4 seconds, then 16 seconds between each re-connection attempt.

Changes in MySQL Connector/J 1.0 (24 August 1998)

Fixed handling of blob data in Buffer.java

Fixed bug with authentication packet being sized too small.

The JDBC Driver is now under the LGPL

8-14-98

Fixed Buffer.readLenString() to correctly read data for BLOBS.

Fixed PreparedStatement.stringToStream to correctly read data for BLOBS.

Fixed PreparedStatement.setDate() to not add a day. (above fixes thanks to Vincent Partington)

Added URL parameter parsing (?user=... and so forth).

Changes in MySQL Connector/J 0.9d (04 August 1998)

Big news! New package name. Tim Endres from ICE Engineering is starting a new source tree for GNU GPL'd Java software. He's graciously given me the org.gjt.mm package directory to use, so now the driver is in the org.gjt.mm.mysql package scheme. I'm "legal" now. Look for more information on Tim's project soon.

Now using dynamically sized packets to reduce memory usage when sending commands to the DB.

Small fixes to getTypeInfo() for parameters, and so forth.

DatabaseMetaData is now fully implemented. Let me know if these drivers work with the various IDEs out there. I've heard that they're working with JBuilder right now.

Added JavaDoc documentation to the package.

Package now available in .zip or .tar.gz.

Changes in MySQL Connector/J 0.9 (28 July 1998)

Implemented getTypeInfo(). Connection.rollback() now throws an SQLException per the JDBC spec.

Added PreparedStatement that supports all JDBC API methods for PreparedStatement including InputStreams. Please check this out and let me know if anything is broken.

Fixed a bug in ResultSet that would break some queries that only returned 1 row.

Fixed bugs in DatabaseMetaData.getTables(), DatabaseMetaData.getColumns() and DatabaseMetaData.getCatalogs().

Added functionality to Statement that enables executeUpdate() to store values for IDs that are automatically generated for AUTO_INCREMENT fields. Basically, after an executeUpdate(), look at the SQLWarnings for warnings like "LAST_INSERTED_ID = 'some number', COMMAND = 'your SQL query'". If you are using AUTO_INCREMENT fields in your tables and are executing a lot of executeUpdate()s on one Statement, be sure to clearWarnings() every so often to save memory.

Changes in MySQL Connector/J 0.8 (06 July 1998)

Split MysqlIO and Buffer to separate classes. Some ClassLoaders gave an IllegalAccess error for some fields in those two classes. Now mm.mysql works in applets and all classloaders. Thanks to Joe Ennis <jce@mail.boone.com> for pointing out the problem and working on a fix with me.

Changes in MySQL Connector/J 0.7 (01 July 1998)

Fixed DatabaseMetadata problems in getColumns() and bug in switch statement in the Field constructor. Thanks to Costin Manolache <costin@tdiinc.com> for pointing these out.

Changes in MySQL Connector/J 0.6 (21 May 1998)

Incorporated efficiency changes from Richard Swift <Richard.Swift@kanatek.ca> in MysqlIO.java and ResultSet.java:

We're now 15% faster than gwe's driver.

Started working on DatabaseMetaData.

The following methods are implemented:

getTables()

getTableTypes()

getColumns()

getCatalogs()