Creating Geometry Values Using MySQL-Specific Functions

MySQL provides a set of useful nonstandard functions for creating geometry values. The functions described in this section are MariaDB 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(g1,g2,...)

  Constructs a GeometryCollection.

• LineString(pt1,pt2,...)

  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(ls1,ls2,...)

  Constructs a MultiLineString value using LineString or WKB LineString arguments.

• MultiPoint(pt1,pt2,...)

  Constructs a MultiPoint value using Point or WKB Point arguments.

• MultiPolygon(poly1,poly2,...)

  Constructs a MultiPolygon value from a set of Polygon or WKB Polygon arguments.

• Point(x,y)

  Constructs a Point using its coordinates.

• Polygon(ls1,ls2,...)

  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.

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