alter_foreign_data_wrapper(7)

NAME#

ALTER_FOREIGN_DATA_WRAPPER - change the definition of a foreign-data wrapper

SYNOPSIS#

ALTER FOREIGN DATA WRAPPER \nname\n
\n
    [ HANDLER \nhandler_function\n | NO HANDLER ]
\n
    [ VALIDATOR \nvalidator_function\n | NO VALIDATOR ]
\n
    [ OPTIONS ( [ ADD | SET | DROP ] \noption\n ['\nvalue\n'] [, ... ]) ]
ALTER FOREIGN DATA WRAPPER \nname\n OWNER TO { \nnew_owner\n | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER FOREIGN DATA WRAPPER \nname\n RENAME TO \nnew_name

DESCRIPTION#

ALTER FOREIGN DATA WRAPPER 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.

PARAMETERS#

name

HANDLER handler_function

NO HANDLER

Note that foreign tables that use a foreign-data wrapper with no handler cannot be accessed.

VALIDATOR validator_function

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 ALTER FOREIGN DATA WRAPPER command will be checked using the new validator.

NO VALIDATOR

OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ] )

new_owner

new_name

EXAMPLES#

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;

COMPATIBILITY#

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

SEE ALSO#

CREATE FOREIGN DATA WRAPPER (CREATE_FOREIGN_DATA_WRAPPER(7)), DROP FOREIGN DATA WRAPPER (DROP_FOREIGN_DATA_WRAPPER(7))