MySQL 错误代码:2003 idea错误：ERROR DruidDataSource:1846

idea项目一启动就报错：

20:01:13,047 ERROR DruidDataSource:1846 - create connection error
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

.....

瞄了一下jdbc.propertioes，没毛病啊，去看下mysql，发现登录报错：

经网络搜索说是mysql服务没启动，遂win+s搜索服务，打开服务找到mysql。。。缓缓打出一个问号。。？。。还真没启动(＠_＠;)，惊了，这我就纳闷了，平常一直都是自启，难道是我昨天装了电脑管家，软件权限一通瞎几把操作，把mysql服务都杀了？

遂启动MySQL服务，ojbk。