create_conversion man page on aLinux

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CREATE CONVERSION()		 SQL Commands		   CREATE CONVERSION()

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 encod‐
       ings. 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.

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 may be schema-
	      qualified. If it is not, the conversion is defined in  the  cur‐
	      rent 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
	      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;

NOTES
       Use DROP CONVERSION to remove user-defined conversions.

       The  privileges	required  to  create  a conversion may 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  CON‐
       VERSION statement in the SQL standard.

SEE ALSO
       ALTER  CONVERSION  [alter_conversion(7)], CREATE FUNCTION [create_func‐
       tion(l)], DROP CONVERSION [drop_conversion(l)]

SQL - Language Statements	  2005-11-05		   CREATE CONVERSION()
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