transactions.py 文件源码

def get(self, request=None):
        """Return the current request specific transaction

        :param request: current request

        """
        if request is None:
            request = get_current_request()

        if getattr(request, '_txn', None) is None:
            request._txn = transaction.Transaction(self._synchs, self)
            request._txn_time = time.time()
        return request._txn

    # ITransactionManager