Documentation Home
MySQL 5.6 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 29.0Mb
PDF (A4) - 29.0Mb
PDF (RPM) - 28.0Mb
HTML Download (TGZ) - 7.1Mb
HTML Download (Zip) - 7.1Mb
HTML Download (RPM) - 6.1Mb
Man Pages (TGZ) - 181.9Kb
Man Pages (Zip) - 291.8Kb
Info (Gzip) - 2.8Mb
Info (Zip) - 2.8Mb
Excerpts from this Manual

MySQL 5.6 Reference Manual  /  ...  /  GeometryCollection Property Functions

12.17.7.5 GeometryCollection Property Functions

These functions return properties of GeometryCollection values.

  • GeometryN(gc, N)

    ST_GeometryN() and GeometryN() are synonyms. For more information, see the description of ST_GeometryN().

  • NumGeometries(gc)

    ST_NumGeometries() and NumGeometries() are synonyms. For more information, see the description of ST_NumGeometries().

  • ST_GeometryN(gc, N)

    Returns the N-th geometry in the GeometryCollection value gc. Geometries are numbered beginning with 1. If any argument is NULL or the geometry argument is an empty geometry, the return value is NULL.

    mysql> SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))';
    mysql> SELECT ST_AsText(ST_GeometryN(ST_GeomFromText(@gc),1));
    +-------------------------------------------------+
    | ST_AsText(ST_GeometryN(ST_GeomFromText(@gc),1)) |
    +-------------------------------------------------+
    | POINT(1 1)                                      |
    +-------------------------------------------------+

    ST_GeometryN() and GeometryN() are synonyms.

  • ST_NumGeometries(gc)

    Returns the number of geometries in the GeometryCollection value gc. If the argument is NULL or an empty geometry, the return value is NULL.

    mysql> SET @gc = 'GeometryCollection(Point(1 1),LineString(2 2, 3 3))';
    mysql> SELECT ST_NumGeometries(ST_GeomFromText(@gc));
    +----------------------------------------+
    | ST_NumGeometries(ST_GeomFromText(@gc)) |
    +----------------------------------------+
    |                                      2 |
    +----------------------------------------+

    ST_NumGeometries() and NumGeometries() are synonyms.