EndPoint(ls)

ST_EndPoint() and EndPoint() are synonyms. For more information, see the description of ST_EndPoint().

GLength(ls)

Returns a double-precision number indicating the length of the LineString or MultiLineString value ls in its associated spatial reference. The length of a MultiLineString value is equal to the sum of the lengths of its elements.

mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT GLength(GeomFromText(@ls));
+----------------------------+
| GLength(GeomFromText(@ls)) |
+----------------------------+
|         2.8284271247461903 |
+----------------------------+

mysql> SET @mls = 'MultiLineString((1 1,2 2,3 3),(4 4,5 5))';
mysql> SELECT GLength(GeomFromText(@mls));
+-----------------------------+
| GLength(GeomFromText(@mls)) |
+-----------------------------+
|           4.242640687119286 |
+-----------------------------+

GLength() is a nonstandard name. It corresponds to the OpenGIS Length() function. (There is an existing SQL function Length() that calculates the length of string values.)

IsClosed(ls)

ST_IsClosed() and IsClosed() are synonyms. For more information, see the description of ST_IsClosed().

NumPoints(ls)

ST_NumPoints() and NumPoints() are synonyms. For more information, see the description of ST_NumPoints().

PointN(ls,N)

ST_PointN() and PointN() are synonyms. For more information, see the description of ST_PointN().

ST_EndPoint(ls)

Returns the Point that is the endpoint of the LineString value ls.

mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT ST_AsText(ST_EndPoint(ST_GeomFromText(@ls)));
+----------------------------------------------+
| ST_AsText(ST_EndPoint(ST_GeomFromText(@ls))) |
+----------------------------------------------+
| POINT(3 3)                                   |
+----------------------------------------------+

ST_EndPoint() and EndPoint() are synonyms.

ST_EndPoint() was added in MySQL 5.6.1.

ST_IsClosed(ls)

For a LineString value ls, ST_IsClosed() returns 1 if ls is closed (that is, its ST_StartPoint() and ST_EndPoint() values are the same).

For a MultiLineString value ls, ST_IsClosed() returns 1 if ls is closed (that is, the ST_StartPoint() and ST_EndPoint() values are the same for each LineString in ls).

ST_IsClosed() returns 0 if ls is not closed, and NULL if ls is NULL.

mysql> SET @ls1 = 'LineString(1 1,2 2,3 3,2 2)';
mysql> SET @ls2 = 'LineString(1 1,2 2,3 3,1 1)';

mysql> SELECT ST_IsClosed(ST_GeomFromText(@ls1));
+------------------------------------+
| ST_IsClosed(ST_GeomFromText(@ls1)) |
+------------------------------------+
|                                  0 |
+------------------------------------+

mysql> SELECT ST_IsClosed(ST_GeomFromText(@ls2));
+------------------------------------+
| ST_IsClosed(ST_GeomFromText(@ls2)) |
+------------------------------------+
|                                  1 |
+------------------------------------+

mysql> SET @ls3 = 'MultiLineString((1 1,2 2,3 3),(4 4,5 5))';

mysql> SELECT ST_IsClosed(ST_GeomFromText(@ls3));
+------------------------------------+
| ST_IsClosed(ST_GeomFromText(@ls3)) |
+------------------------------------+
|                                  0 |
+------------------------------------+

ST_IsClosed() and IsClosed() are synonyms.

ST_IsClosed() was added in MySQL 5.6.1.

ST_NumPoints(ls)

Returns the number of Point objects in the LineString value ls.

mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT ST_NumPoints(ST_GeomFromText(@ls));
+------------------------------------+
| ST_NumPoints(ST_GeomFromText(@ls)) |
+------------------------------------+
|                                  3 |
+------------------------------------+

ST_NumPoints() and NumPoints() are synonyms.

ST_NumPoints() was added in MySQL 5.6.1.

ST_PointN(ls,N)

Returns the N-th Point in the Linestring value ls. Points are numbered beginning with 1.

mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT ST_AsText(ST_PointN(ST_GeomFromText(@ls),2));
+----------------------------------------------+
| ST_AsText(ST_PointN(ST_GeomFromText(@ls),2)) |
+----------------------------------------------+
| POINT(2 2)                                   |
+----------------------------------------------+

ST_PointN() and PointN() are synonyms.

ST_PointN() was added in MySQL 5.6.1.

ST_StartPoint(ls)

Returns the Point that is the start point of the LineString value ls.

mysql> SET @ls = 'LineString(1 1,2 2,3 3)';
mysql> SELECT ST_AsText(ST_StartPoint(ST_GeomFromText(@ls)));
+------------------------------------------------+
| ST_AsText(ST_StartPoint(ST_GeomFromText(@ls))) |
+------------------------------------------------+
| POINT(1 1)                                     |
+------------------------------------------------+

ST_StartPoint() and StartPoint() are synonyms.

ST_StartPoint() was added in MySQL 5.6.1.

StartPoint(ls)

ST_StartPoint() and StartPoint() are synonyms. For more information, see the description of ST_StartPoint().