base.py 文件源码

def set_rollback(self, rollback):
        """
        Set or unset the "needs rollback" flag -- for *advanced use* only.
        """
        if not self.in_atomic_block:
            raise TransactionManagementError(
                "The rollback flag doesn't work outside of an 'atomic' block.")
        self.needs_rollback = rollback