CREATE 
CONVERSION(7)						   SQL Commands 					      CREATE CONVERSION(7)

NAME

       CREATE CONVERSION - define a new encoding conversion

SYNOPSIS

       CREATE [ DEFAULT ] CONVERSION name
	   FOR source_encoding TO dest_encoding FROM funcname

DESCRIPTION

       CREATE CONVERSION defines a new conversion between character set encodings. Also, conversions that are marked DEFAULT can be used for auto-
       matic 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.

PARAMETERS

       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.

       name   The name of the conversion. The conversion name can 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_encoding
	      The source encoding name.

       dest_encoding
	      The destination encoding name.

       funcname
	      The function used to perform the conversion. The function name can 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;

NOTES

       Use DROP CONVERSION to remove user-defined conversions.

       The privileges required to create a conversion might be changed in a future release.

EXAMPLES

       To create a conversion from encoding UTF8 to LATIN1 using myfunc:

       CREATE CONVERSION myconv FOR 'UTF8' TO 'LATIN1' FROM myfunc;

COMPATIBILITY

       CREATE CONVERSION is a PostgreSQL extension.  There is no CREATE CONVERSION statement in the SQL standard.

SEE ALSO

       ALTER CONVERSION [alter_conversion(7)], CREATE FUNCTION [create_function(7)], DROP CONVERSION [drop_conversion(7)]

SQL - Language Statements					    2010-05-14						      CREATE CONVERSION(7)