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Jun 01, 2016 pm 01:08 PM

相信用过Mysql的朋友都遇到过这个问题，而我几乎每次用的时候都会出现。

经过多次的总结，发现的一些经验，与大家分享下。

目前发现引起这个问题的原因有两个，一个是连接超时，mysql有一个默认的连接时间，超过之后就会遇到这个问题，这时可以在my.ini文件中[mysqld]后面加上

wait_timeout=1814400。当然这个值只有够大都行。改完后net stop mysql net start mysql.

另一个原因是端口问题，至于为什么会这样，实在不清楚。但如果在连接mysql的时候把端口与my.ini中设置的不同，也会出现这个异常。

如果这两个方法都解决不了问题，你就应该开始怀疑mysql配置文件的位置了，一般默认的配置文件放在mysql的安装目录下，可在windows server上的一次配置上，却发现这个文件也可能放在c:/programData/mysql 下，当时我在安装目录下，不管怎么改都没有效果，甚至随意乱写，Mysql依然能直觉启动。c:/programData是一个隐藏目录.

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