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			return;

		}

		$conname = $fi->conname();

		if ( $fi->conname() ) {

			$this->output( "Dropping foreign key constraint on '$table.$field'\n" );

			$conclause = "CONSTRAINT \"$conname\"";

			$command = "ALTER TABLE $table DROP CONSTRAINT $conname";

			$this->db->query( $command );

		} else {

			$this->output( "...foreign key constraint on '$table.$field' already does not exist\n" );

		};

	}

	protected function changeFkeyDeferrable( $table, $field, $clause ) {

		}

		$this->output( "Altering column '$table.$field' to be DEFERRABLE INITIALLY DEFERRED\n" );

		$conname = $fi->conname();

		if ( $fi->conname() ) {

			$conclause = "CONSTRAINT \"$conname\"";

			$command = "ALTER TABLE $table DROP CONSTRAINT $conname";

			$this->db->query( $command );

		} else {

			$this->output( "Column '$table.$field' does not have a foreign key " .

				"constraint, will be added\n" );

			$conclause = "";

		}

		$command =

			"ALTER TABLE $table ADD $conclause " .

			"FOREIGN KEY ($field) REFERENCES $clause DEFERRABLE INITIALLY DEFERRED";