def get_legacy_facade(self):
        if not self._legacy_facade:
            self._legacy_facade = LegacyEngineFacade(None, _factory=self)
            if not self._started:
                self._start()

        return self._legacy_facade
Return a :class:`.LegacyEngineFacade` for this factory.
dataset/ETHPy150Open openstack/oslo.db/oslo_db/sqlalchemy/enginefacade.py/_TransactionFactory.get_legacy_facade