ALTER FOREIGN DATA WRAPPER(7)

NAME
ALTER_FOREIGN_DATA_WRAPPER - change the definition of a foreign-data wrapper

SYNOPSIS

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

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
    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 after changing the validator the options to the foreign-data wrapper, servers, and user mappings have become invalid. It is up to the user to make sure that these options are correct before using the foreign-data wrapper.

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.

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 and OWNER TO clauses are extensions.

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