MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
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 is NULL.
For example, you can insert the geometry return value from
Point() directly into a
POINT column:
INSERT INTO t1 (pt_col) VALUES(Point(1,2));
GeometryCollection(
g
[, g] ...)
Constructs a GeometryCollection 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.
Constructs a LineString value from a number
of Point or WKB Point
arguments. If the number of arguments is less than two, the
return value is NULL.
MultiLineString(
ls
[, ls] ...)
Constructs a MultiLineString value using
LineString or WKB
LineString arguments.
Constructs a MultiPoint value using
Point or WKB Point
arguments.
MultiPolygon(
poly
[, poly] ...)
Constructs a MultiPolygon value from a set
of Polygon or WKB
Polygon arguments.
Constructs a Point using its coordinates.
Constructs a Polygon value from a number of
LineString or WKB
LineString arguments. If any argument does
not represent a LinearRing (that is, not a
closed and simple LineString), the return
value is NULL.