Return detailed information about warnings as a
        sequence of tuples of (Level, Code, Message). This
        is only supported in MySQL-4.1 and up. If your server
        is an earlier version, an empty sequence is returned.

def show_warnings(self):
        """Return detailed information about warnings as a
        sequence of tuples of (Level, Code, Message). This
        is only supported in MySQL-4.1 and up. If your server
        is an earlier version, an empty sequence is returned."""
        if self._server_version < (4,1): return ()
        self.query("SHOW WARNINGS")
        r = self.store_result()
        warnings = r.fetch_row(0)
        return warnings