Get the next query set

def _nextset(self, unbuffered=False):
        """Get the next query set"""
        conn = self._get_db()
        current_result = self._result
        if current_result is None or current_result is not conn._result:
            return None
        if not current_result.has_next:
            return None
        self._result = None
        self._clear_result()
        conn.next_result(unbuffered=unbuffered)
        self._do_get_result()
        return True