PostGIS
Synopsis
+geometry +ST_LineFromWKB(+`bytea `+WKB`)`;
+geometry +ST_LineFromWKB(+`bytea `+WKB, integer
srid`)`;
Description
The ST_LineFromWKB function, takes a well-known binary
representation of geometry and a Spatial Reference System ID (SRID)
and creates an instance of the appropriate geometry type - in this case,
a LINESTRING geometry. This function plays the role of the Geometry
Factory in SQL.
If an SRID is not specified, it defaults to 0. NULL is returned if
the input bytea does not represent a LINESTRING.
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This method
implements the OGC Simple
Features Implementation Specification for SQL 1.1. s3.2.6.2
This method
implements the SQL/MM specification. SQL-MM 3: 7.2.9
Examples
SELECT ST_LineFromWKB(ST_AsBinary(ST_GeomFromText('LINESTRING(1 2, 3 4)'))) AS aline,
ST_LineFromWKB(ST_AsBinary(ST_GeomFromText('POINT(1 2)'))) IS NULL AS null_return;
aline | null_return
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010200000002000000000000000000F ... | t