def description(self):
        """ Cursor description, see http://legacy.python.org/dev/peps/pep-0249/#description
        """
        if self._session is None:
            return None
        res = self._session.res_info
        if res:
            return res.description
        else:
            return None
Cursor description, see http://legacy.python.org/dev/peps/pep-0249/#description