CREATE CONVERSION — define a new encoding conversion
CREATE [DEFAULT] CONVERSIONnameFORsource_encodingTOdest_encodingFROMfuncname
CREATE CONVERSION defines a new conversion between
character set encodings. Conversion names may be used in the
convert function
to specify a particular encoding conversion. Also, conversions that
are marked DEFAULT can be used for automatic encoding
conversion between
client and server. For this purpose, two conversions, from encoding A to
B and from encoding B to A, must be defined.
To be able to create a conversion, you must have EXECUTE privilege
on the function and CREATE privilege on the destination schema.
DEFAULT The DEFAULT clause indicates that this conversion
is the default for this particular source to destination
encoding. There should be only one default encoding in a schema
for the encoding pair.
nameThe name of the conversion. The conversion name may be schema-qualified. If it is not, the conversion is defined in the current schema. The conversion name must be unique within a schema.
source_encodingThe source encoding name.
dest_encodingThe destination encoding name.
funcnameThe function used to perform the conversion. The function name may be schema-qualified. If it is not, the function will be looked up in the path.
The function must have the following signature:
conv_proc(
integer, -- source encoding ID
integer, -- destination encoding ID
cstring, -- source string (null terminated C string)
internal, -- destination (fill with a null terminated C string)
integer -- source string length
) RETURNS void;
Use DROP CONVERSION to remove user-defined conversions.
The privileges required to create a conversion may be changed in a future release.
To create a conversion from encoding UTF8 to
LATIN1 using myfunc:
CREATE CONVERSION myconv FOR 'UTF8' TO 'LATIN1' FROM myfunc;