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11.5.8 Fetching Spatial Data

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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:

    1. 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.

    1. 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.

    1. SELECT ST_AsBinary(g) FROM geom;

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Document created the 26/06/2006, last modified the 26/10/2018
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