| CREATE_CONVERSION(7) - phpMan
CREATE CONVERSION(7) PostgreSQL 12.3 Documentation CREATE CONVERSION(7)
NAME
CREATE_CONVERSION - define a new encoding conversion
SYNOPSIS
CREATE [ DEFAULT ] CONVERSION name
FOR source_encoding TO dest_encoding FROM function_name
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.
function_name
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, but a CREATE TRANSLATION statement that is very similar in purpose and
syntax.
SEE ALSO
ALTER CONVERSION (ALTER_CONVERSION(7)), CREATE FUNCTION (CREATE_FUNCTION(7)), DROP
CONVERSION (DROP_CONVERSION(7))
PostgreSQL 12.3 2020 CREATE CONVERSION(7)
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