3.数据库链接数据库报错：ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/opt/Weixin/mysql_database/mysql.sock' (111) service mysqld start——Another MySQL daemon already running with the sa

解决：将之前mysql.sock文件删除或更改文件名，因为mysql运行过程中突然中止导致。

执行service mysqld restart后成功