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RedHat 9 (Linux i386) - man page for create_conversion (redhat section 7)

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

NAME
       CREATE CONVERSION - define a user-defined conversion

SYNOPSIS
       CREATE [DEFAULT] CONVERSION conversion_name
	   FOR source_encoding TO dest_encoding FROM funcname

DESCRIPTION
       CREATE  CONVERSION  defines a new encoding conversion. 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 frontend and backend.
       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 the execute right on the function and the
       create right on the destination schema.	"PARAMETERS"

       DEFAULT
	      The DEFAULT clause indicates that this conversion is the default for this  particu-
	      lar  source to destination encoding. There should be only one default encoding in a
	      schema for the encoding pair.

       conversion_name
	      The 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_encoding
	      The source encoding name.

       source_encoding
	      The destination encoding name.

       funcname
	      The function used to perform the conversion. The function name may be schema-quali-
	      fied. 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)
		   CSTRING,  -- destination string (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 UNICODE to LATIN1 using myfunc:

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

COMPATIBILITY
       CREATE  CONVERSION  is a PostgreSQL extension.  There is no CREATE CONVERSION statement in
       SQL99.

SEE ALSO
       CREATE FUNCTION [create_function(7)],  DROP  CONVERSION	[drop_conversion(7)],  PostgreSQL
       Programmer's Guide

SQL - Language Statements		    2002-11-22			     CREATE CONVERSION(7)


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