问题
MySQL会在一定周期的为连接前提下报错，如下
The last packet successfully received from the server was XXX milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.
原因
MySQL Server 端这边因为超时断开了客户端发起的TCP连接，而客户端此时并不知道，尝试通过原有通道连接时，报错
解决方案
将MySQL Server的wait_timeout参数改成1800或者更大即可
具体相关参数详情亦可参照官网
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_wait_timeout