11.4.7 Fetching Spatial Data

Geometry values stored in a table can be fetched in internal format. You can also convert them to WKT or WKB format.

• Fetching spatial data in internal format:

  Fetching geometry values using internal format can be useful in table-to-table transfers:

  CREATE TABLE geom2 (g GEOMETRY) SELECT g FROM geom;

• Fetching spatial data in WKT format:

  The ST_AsText() function converts a geometry from internal format to a WKT string.

  SELECT ST_AsText(g) FROM geom;

• Fetching spatial data in WKB format:

  The ST_AsBinary() function converts a geometry from internal format to a BLOB containing the WKB value.

  SELECT ST_AsBinary(g) FROM geom;