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MySQL 9.0 Reference Manual

14.16.5 MySQL-Specific Functions That Create Geometry Values

MySQL provides a set of useful nonstandard functions for creating geometry values. The functions described in this section are MySQL extensions to the OpenGIS specification.

These functions produce geometry objects from either WKB values or geometry objects as arguments. If any argument is not a proper WKB or geometry representation of the proper object type, the return value isNULL.

For example, you can insert the geometry return value fromPoint() directly into aPOINT column:

INSERT INTO t1 (pt_col) VALUES(Point(1,2));

GeomCollection(g [,g] ...)
Constructs aGeomCollection value from the geometry arguments.
GeomCollection() returns all the proper geometries contained in the arguments even if a nonsupported geometry is present.
GeomCollection() with no arguments is permitted as a way to create an empty geometry. Also, functions such asST_GeomFromText() that accept WKT geometry collection arguments understand both OpenGIS'GEOMETRYCOLLECTION EMPTY' standard syntax and MySQL'GEOMETRYCOLLECTION()' nonstandard syntax.
GeomCollection() andGeometryCollection() are synonymous, withGeomCollection() the preferred function.
GeometryCollection(g [,g] ...)
Constructs aGeomCollection value from the geometry arguments.
GeometryCollection() returns all the proper geometries contained in the arguments even if a nonsupported geometry is present.
GeometryCollection() with no arguments is permitted as a way to create an empty geometry. Also, functions such asST_GeomFromText() that accept WKT geometry collection arguments understand both OpenGIS'GEOMETRYCOLLECTION EMPTY' standard syntax and MySQL'GEOMETRYCOLLECTION()' nonstandard syntax.
GeomCollection() andGeometryCollection() are synonymous, withGeomCollection() the preferred function.
LineString(pt [,pt] ...)
Constructs aLineString value from a number ofPoint or WKBPoint arguments. If the number of arguments is less than two, the return value isNULL.
MultiLineString(ls [,ls] ...)
Constructs aMultiLineString value usingLineString or WKBLineString arguments.
MultiPoint(pt [,pt2] ...)
Constructs aMultiPoint value usingPoint or WKBPoint arguments.
MultiPolygon(poly [,poly] ...)
Constructs aMultiPolygon value from a set ofPolygon or WKBPolygon arguments.
Point(x,y)
Constructs aPoint using its coordinates.
Polygon(ls [,ls] ...)
Constructs aPolygon value from a number ofLineString or WKBLineString arguments. If any argument does not represent aLinearRing (that is, not a closed and simpleLineString), the return value isNULL.

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