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CREATE CONVERSION(7) | PostgreSQL 9.6.12 Documentation | CREATE CONVERSION(7) |
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¶
DEFAULTThe 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))2019 | PostgreSQL 9.6.12 |