ST_MLineFromText-ApsaraDB RDS(RDS)-阿里云帮助中心

Constructs a MultiLineString geometry from a Well-Known Text (WKT) string and an optional spatial reference identifier (SRID).

Syntax

geometry ST_MLineFromText(text wKT, integer srid);
geometry ST_MLineFromText(text wKT);

Parameters

Parameter	Description
`wKT`	The WKT string representing a MultiLineString geometry.
`srid`	The SRID of the MultiLineString geometry. Defaults to `0` if not specified.

Usage notes

If the WKT string does not represent a MultiLineString geometry, the function returns null.
If you know the input is a valid MultiLineString, use ST_GeomFromText instead. ST_GeomFromText constructs the geometry faster because no unnecessary checks are required.

Examples

SELECT ST_AsText(ST_MLineFromText('MULTILINESTRING((1 2,3 4), (5 6,7 8))'));
              st_astext
--------------------------------------
 MULTILINESTRING((1 2,3 4),(5 6,7 8))
(1 row)