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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 encod‐
       ings. 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 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
	      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 CON‐
       VERSION statement in the SQL standard.

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

SQL - Language Statements	  2013-04-02		  CREATE CONVERSION(7)
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