通过MySQLdb 连接mysql，如果长时间不活动，会被mysql断开，再次请求的时候会导致抛出异常"_mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away')"
这是因为mysql有两个参数来自动断开不活跃的连接，MySQLdb的连接超过这个时间后就会被mysql自动断开。
interactive_timeout
wait_timeout
可以登陆mysql 执行show global variables like "%timeout%" 进行查看
修改mysql的配置，对上面两个参数进行修改
使用conn的ping()方法进行重新连接
conn = MySQLdb.conn(xxxxx)
conn.ping(True)
ping(...)
Checks whether or not the connection to the server is
working. If it has gone down, an automatic reconnection is
attempted.
This function can be used by clients that remain idle for a
long while, to check whether or not the server has closed the
connection and reconnect if necessary.
New in 1.2.2: Accepts an optional reconnect parameter. If True,
then the client will attempt reconnection. Note that this setting
is persistent. By default, this is on in MySQL<5.0.3, and off
thereafter.
Non-standard. You should assume that ping() performs an
implicit rollback; use only when starting a new transaction.
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