def _set_cache(self, table_name, column_name=None, value=INVALID):
        db_name = self._get_setting('NAME')
        try:
            if column_name is not None:
                self._constraint_cache[db_name][table_name][column_name] = value
            else:
                self._constraint_cache[db_name][table_name] = value
        except (LookupError, __HOLE__):
            pass
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/South-1.0.2/south/db/generic.py/DatabaseOperations._set_cache