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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 encodings. Also, conversions that are marked
       DEFAULT can be used for automatic encoding conversion between client and server. For this purpose, two  conver-
       sions, 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  destina-
              tion 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_conver-
       sion(7)]



SQL - Language Statements         2014-02-17              CREATE CONVERSION(7)