Name
CREATE CONVERSION -- define a new encoding conversionSynopsis
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.
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