def reopen(self):
        """Reopen the tough connection.

        It will not complain if the connection cannot be reopened.

        """
        try:
            self._con.reopen()
        except Exception:
            if self._transcation:
                self._transaction = False
                try:
                    self._con.query('rollback')
                except Exception:
                    pass
        else:
            self._transaction = False
            self._closed = False
            self._setsession()
            self._usage = 0
Reopen the tough connection.

        It will not complain if the connection cannot be reopened.