ALTER_FOREIGN_DATA_WRAPPER - change the definition of a foreign-data wrapper

ALTERFOREIGNDATAWRAPPER conforms to ISO/IEC 9075-9 (SQL/MED), except that the HANDLER, VALIDATOR, OWNER TO, and RENAME clauses are extensions.

ALTERFOREIGNDATAWRAPPER changes the definition of a foreign-data wrapper. The first form of the command changes the support functions or the generic options of the foreign-data wrapper (at least one clause is required). The second form changes the owner of the foreign-data wrapper. Only superusers can alter foreign-data wrappers. Additionally, only superusers can own foreign-data wrappers.

Change a foreign-data wrapper dbi, add option foo, drop bar: ALTER FOREIGN DATA WRAPPER dbi OPTIONS (ADD foo '1', DROP bar); Change the foreign-data wrapper dbi validator to bob.myvalidator: ALTER FOREIGN DATA WRAPPER dbi VALIDATOR bob.myvalidator;

ALTER_FOREIGN_DATA_WRAPPER - change the definition of a foreign-data wrapper

name The name of an existing foreign-data wrapper. HANDLER handler_function Specifies a new handler function for the foreign-data wrapper. NO HANDLER This is used to specify that the foreign-data wrapper should no longer have a handler function. Note that foreign tables that use a foreign-data wrapper with no handler cannot be accessed. VALIDATOR validator_function Specifies a new validator function for the foreign-data wrapper. Note that it is possible that pre-existing options of the foreign-data wrapper, or of dependent servers, user mappings, or foreign tables, are invalid according to the new validator. PostgreSQL does not check for this. It is up to the user to make sure that these options are correct before using the modified foreign-data wrapper. However, any options specified in this ALTERFOREIGNDATAWRAPPER command will be checked using the new validator. NO VALIDATOR This is used to specify that the foreign-data wrapper should no longer have a validator function. OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ] ) Change options for the foreign-data wrapper. ADD, SET, and DROP specify the action to be performed. ADD is assumed if no operation is explicitly specified. Option names must be unique; names and values are also validated using the foreign data wrapper's validator function, if any. new_owner The user name of the new owner of the foreign-data wrapper. new_name The new name for the foreign-data wrapper.

CREATE FOREIGN DATA WRAPPER (CREATE_FOREIGN_DATA_WRAPPER(7)), DROP FOREIGN DATA WRAPPER (DROP_FOREIGN_DATA_WRAPPER(7)) PostgreSQL 17.5 2025 ALTERFOREIGNDATAWRAPPER(7)

ALTER FOREIGN DATA WRAPPER name [ HANDLER handler_function | NO HANDLER ] [ VALIDATOR validator_function | NO VALIDATOR ] [ OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ]) ] ALTER FOREIGN DATA WRAPPER name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER } ALTER FOREIGN DATA WRAPPER name RENAME TO new_name