Categories:

Geospatial functions, Conversion functions

ST_GEOMETRYFROMWKB¶

Parses a WKB (well-known binary) or EWKB (extended well-known binary) input and returns a value of type GEOMETRY.

Aliases:

ST_GEOMFROMWKB , ST_GEOMETRYFROMEWKB , ST_GEOMFROMEWKB

See also:

TO_GEOMETRY

Syntax¶

ST_GEOMETRYFROMWKB( <varchar_or_binary_expression> [ , <srid> ]  [ , <allow_invalid> ] )

ST_GEOMFROMWKB( <varchar_or_binary_expression> [ , <srid> ]  [ , <allow_invalid> ] )

ST_GEOMETRYFROMEWKB( <varchar_or_binary_expression> [ , <srid> ] [ , <allow_invalid> ] )

ST_GEOMFROMEWKB( <varchar_or_binary_expression> [ , <srid> ] [ , <allow_invalid> ] )
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Arguments¶

Required:

varchar_or_binary_expression

The argument must be a string or binary expression in WKB or EWKB that represents a valid geospatial object.

A string expression must be in hexadecimal format (without a leading 0x).

Optional:

srid

The integer value of the SRID to use.

allow_invalid

If TRUE, specifies that the function should return a GEOGRAPHY or GEOMETRY object, even when the input shape is invalid and cannot be repaired. For details, refer to Specifying how invalid geospatial shapes are handled.

Returns¶

The function returns a value of type GEOMETRY.

Usage notes¶

  • Issues an error if the input cannot be parsed as WKB or EWKB.

  • For WKB input, if the srid argument is not specified, the resulting GEOMETRY object has the SRID set to 0.

Examples¶

The following example returns the GEOMETRY object for a geospatial object described in EWKB format:

-- Set the geometry output format to EWKT
ALTER SESSION SET GEOMETRY_OUTPUT_FORMAT='EWKT';

SELECT ST_GEOMETRYFROMEWKB('0101000020797F000066666666A9CB17411F85EBC19E325641');
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+---------------------------------------------------------------------------+
| ST_GEOMETRYFROMEWKB('0101000020797F000066666666A9CB17411F85EBC19E325641') |
|---------------------------------------------------------------------------|
| SRID=32633;POINT(389866.35 5819003.03)                                    |
+---------------------------------------------------------------------------+
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In the next example, the input is in WKB format, which does not specify the SRID:

-- Set the geometry output format to EWKT
ALTER SESSION SET GEOMETRY_OUTPUT_FORMAT='EWKT';

SELECT ST_GEOMETRYFROMEWKB('010100000066666666A9CB17411F85EBC19E325641');
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+-------------------------------------------------------------------+
| ST_GEOMETRYFROMEWKB('010100000066666666A9CB17411F85EBC19E325641') |
|-------------------------------------------------------------------|
| SRID=0;POINT(389866.35 5819003.03)                                |
+-------------------------------------------------------------------+
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