ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql
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当使用host参数为“localhost”连接mysql服务时，会优先使用“sock文件”进行连接，而不是使用“IP:端口”进行连接，而Mysql尝试使用“sock文件”进行连接时，却无法获取“sock文件”的位置。
要解决此错误，解决方法：
将连接参数“host”的值由“localhost”改成“127.0.0.1”；
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