The TRIGGERS table provides
information about triggers. To see information about a table's
triggers, you must have the TRIGGER
privilege for the table.
INFORMATION_SCHEMA Name | SHOW Name | Remarks |
|---|---|---|
TRIGGER_CATALOG | def | |
TRIGGER_SCHEMA | ||
TRIGGER_NAME | Trigger | |
EVENT_MANIPULATION | Event | |
EVENT_OBJECT_CATALOG | def | |
EVENT_OBJECT_SCHEMA | ||
EVENT_OBJECT_TABLE | Table | |
ACTION_ORDER | 0 | |
ACTION_CONDITION | NULL | |
ACTION_STATEMENT | Statement | |
ACTION_ORIENTATION | ROW | |
ACTION_TIMING | Timing | |
ACTION_REFERENCE_OLD_TABLE | NULL | |
ACTION_REFERENCE_NEW_TABLE | NULL | |
ACTION_REFERENCE_OLD_ROW | OLD | |
ACTION_REFERENCE_NEW_ROW | NEW | |
CREATED | Created | |
SQL_MODE | sql_mode | MySQL extension |
DEFINER | Definer | MySQL extension |
CHARACTER_SET_CLIENT | character_set_client | MySQL extension |
COLLATION_CONNECTION | collation_connection | MySQL extension |
DATABASE_COLLATION | Database Collation | MySQL extension |
Notes:
The names in the “SHOW
Name” column refer to the SHOW
TRIGGERS statement, not SHOW
CREATE TRIGGER. See Section 13.7.5.39, “SHOW TRIGGERS Syntax”.
TRIGGER_SCHEMA and
TRIGGER_NAME: The name of the database in
which the trigger occurs and the trigger name, respectively.
EVENT_MANIPULATION: The trigger event. This
is the type of operation on the associated table for which the
trigger activates. The value is 'INSERT' (a
row was inserted), 'DELETE' (a row was
deleted), or 'UPDATE' (a row was modified).
EVENT_OBJECT_SCHEMA and
EVENT_OBJECT_TABLE: As noted in
Section 20.3, “Using Triggers”, every trigger is associated with
exactly one table. These columns indicate the database in
which this table occurs, and the table name, respectively.
ACTION_ORDER: The ordinal position of the
trigger's action within the list of all similar triggers on
the same table. This value is always 0,
because it is not possible to have more than one trigger with
the same EVENT_MANIPULATION and
ACTION_TIMING on the same table.
ACTION_STATEMENT: The trigger body; that
is, the statement executed when the trigger activates. This
text uses UTF-8 encoding.
ACTION_ORIENTATION: Always contains the
value 'ROW'.
ACTION_TIMING: Whether the trigger
activates before or after the triggering event. The value is
'BEFORE' or 'AFTER'.
ACTION_REFERENCE_OLD_ROW and
ACTION_REFERENCE_NEW_ROW: The old and new
column identifiers, respectively. This means that
ACTION_REFERENCE_OLD_ROW always contains
the value 'OLD' and
ACTION_REFERENCE_NEW_ROW always contains
the value 'NEW'.
SQL_MODE: The SQL mode in effect when the
trigger was created, and under which the trigger executes. For
the permitted values, see Section 5.1.8, “Server SQL Modes”.
DEFINER: The account of the user who
created the trigger, in
'
format.
user_name'@'host_name'
CHARACTER_SET_CLIENT: The session value of
the character_set_client
system variable when the trigger was created.
COLLATION_CONNECTION: The session value of
the collation_connection
system variable when the trigger was created.
DATABASE_COLLATION: The collation of the
database with which the trigger is associated.
The following columns currently always contain
NULL: ACTION_CONDITION,
ACTION_REFERENCE_OLD_TABLE,
ACTION_REFERENCE_NEW_TABLE, and
CREATED.
Example, using the ins_sum trigger defined in
Section 20.3, “Using Triggers”:
mysql>SELECT * FROM INFORMATION_SCHEMA.TRIGGERSWHERE TRIGGER_SCHEMA='test' AND TRIGGER_NAME='ins_sum'\G*************************** 1. row *************************** TRIGGER_CATALOG: def TRIGGER_SCHEMA: test TRIGGER_NAME: ins_sum EVENT_MANIPULATION: INSERT EVENT_OBJECT_CATALOG: def EVENT_OBJECT_SCHEMA: test EVENT_OBJECT_TABLE: account ACTION_ORDER: 0 ACTION_CONDITION: NULL ACTION_STATEMENT: SET @sum = @sum + NEW.amount ACTION_ORIENTATION: ROW ACTION_TIMING: BEFORE ACTION_REFERENCE_OLD_TABLE: NULL ACTION_REFERENCE_NEW_TABLE: NULL ACTION_REFERENCE_OLD_ROW: OLD ACTION_REFERENCE_NEW_ROW: NEW CREATED: NULL SQL_MODE: DEFINER: me@localhost CHARACTER_SET_CLIENT: utf8 COLLATION_CONNECTION: utf8_general_ci DATABASE_COLLATION: latin1_swedish_ci