MySQL选择查询在Python多处理套接字程序中返回另一个查询结果

Question

我有一个python多处理套接字程序。我使用mysql查询来根据每个套接字连接获取数据。我的代码暂存如下：

    import multiprocessing
    import MySQLdb
    import socket
    import sys
    import os

def handle(connection, address):

try:

    while True:

        #at some condition
        cursor.execute("SELECT a, b, c, d FROM table1 WHERE idx=%s", (somevalue))
        result1    = cursor.fetchone()

        #another condition

        cursor.execute("SELECT e, f, g FROM table2 WHERE idx=%s", (somevalue))
        result2    = cursor.fetchone()

except:
    logger.exception("Problem handling request")
finally:
    #logger.debug("Closing socket")
    #connection.close()
    pass

class Server(object):
    def __init__(self, hostname, port):
        import logging
        self.logger   = logging.getLogger("server")
        self.hostname = hostname
        self.port     = port

def start(self):
    self.logger.debug("listening")
    self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    self.socket.bind((self.hostname, self.port))
    self.socket.listen(1)

    while True:
        conn, address  = self.socket.accept()
        self.logger.debug("Got connection")

        #starting multi process
        process        = multiprocessing.Process(target=handle, args=(conn, address))           
        #process.daemon = True
        process.start()
        self.logger.debug("Started process %r", process)


if __name__ == "__main__":
    import logging


#db connection configuration
db      = MySQLdb.connect("host", "username", "password", "db")
cursor  = db.cursor()


logging.basicConfig(level=logging.DEBUG)

#server ip and port configuration
server = Server("host", port)


try:
    #server start to listen socket
    logging.info("Listening")
    server.start()
except:
    logging.exception("Unexpected exception")
finally:
    logging.info("Shutting down")
    for process in multiprocessing.active_children():
        logging.info("Shutting down process %r", process)
        process.terminate()
        process.join()
logging.info("All done")

该程序可以正常运行一段时间。之后，执行result1的查询作为result2的查询。即，将result1分配给result2。我想念什么？

我尝试了db.commit（）并在每次查询后打开和关闭游标。

我是否必须使用Lock and Release或清除缓存mysql？