Class dummy_engine

web/db.py:593–597

Transaction Engine used instead of subtransaction_engine when sub transactions are not supported.

                self.query("ROLLBACK TO SAVEPOINT webpy_sp_%s")

        class dummy_engine:
            """Transaction Engine used instead of subtransaction_engine
            when sub transactions are not supported."""

            do_transact = do_commit = do_rollback = lambda self: None

        if self.transaction_count:
            # nested transactions are not supported in some databases