db.py 文件源码

def checkout(dbapi_connection, connection_record, connection_proxy):
    pid = os.getpid()
    if connection_record.info['pid'] != pid:
        connection_record.connection = connection_proxy.connection = None
        raise exc.DisconnectionError(
            "Connection record belongs to pid {}, "
            "attempting to check out in pid {}".format(connection_record.info['pid'], pid)
        )