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MySQL 5.5 Reference Manual  /  ...  /  GeometryCollection Property Functions

12.16.7.5 GeometryCollection Property Functions

These functions return properties of GeometryCollection values.

  • 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 AsText(GeometryN(GeomFromText(@gc),1));
    +----------------------------------------+
    | AsText(GeometryN(GeomFromText(@gc),1)) |
    +----------------------------------------+
    | POINT(1 1)                             |
    +----------------------------------------+
  • 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 NumGeometries(GeomFromText(@gc));
    +----------------------------------+
    | NumGeometries(GeomFromText(@gc)) |
    +----------------------------------+
    |                                2 |
    +----------------------------------+