queries.py 文件源码

def setup_sending_before_clearing_queries_log_signal():
    class SignalSendingBeforeClearingQueriesProxy(DelegatingProxy):
        def clear(self):
            before_clearing_queries_log.send(sender=None, queries=tuple(self))
            self.wrapped.clear()

    connection.queries_log = SignalSendingBeforeClearingQueriesProxy(
        connection.queries_log)