Made sure cursor.close() does not complain if cursor is already closed on Oracle

    def fetchall(self):

        return tuple(_rowfactory(r, self.cursor) for r in self.cursor.fetchall())

    def close(self):

        try:

            self.cursor.close()

        except Database.InterfaceError:

            # already closed

            pass

    def var(self, *args):

        return VariableWrapper(self.cursor.var(*args))