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 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)]