queries.py 文件源码

def __enter__(self):
        self.queries = []
        self.nr_of_queries_when_entering = len(connection.queries)
        self.orig_force_debug_cursor = connection.force_debug_cursor
        connection.force_debug_cursor = True
        before_clearing_queries_log.connect(
            self.queries_about_to_be_reset_handler)
        return self