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12.15.6 Geometry Format Conversion Functions

MySQL supports the functions listed in this section for converting geometry values from internal geometry format to WKT or WKB format.

There are also functions to convert a string from WKT or WKB format to internal geometry format. See Section 12.15.3, “Functions That Create Geometry Values from WKT Values”, and Section 12.15.4, “Functions That Create Geometry Values from WKB Values”.

  • AsBinary(g), AsWKB(g)

    Converts a value in internal geometry format to its WKB representation and returns the binary result.

    The result is NULL if the geometry argument is NULL or not a syntactically well-formed geometry.

    SELECT AsBinary(g) FROM geom;
    
  • AsText(g), AsWKT(g)

    Converts a value in internal geometry format to its WKT representation and returns the string result.

    The result is NULL if the geometry argument is NULL or not a syntactically well-formed geometry.

    mysql> SET @g = 'LineString(1 1,2 2,3 3)';
    mysql> SELECT AsText(GeomFromText(@g));
    +--------------------------+
    | AsText(GeomFromText(@g)) |
    +--------------------------+
    | LINESTRING(1 1,2 2,3 3)  |
    +--------------------------+
    

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