問題
MySQL會在一定週期的爲連接前提下報錯，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 端這邊因爲超時斷開了客戶端發起的TCP連接，而客戶端此時並不知道，嘗試通過原有通道連接時，報錯
解決方案
將MySQL Server的wait_timeout參數改成1800或者更大即可
具體相關參數詳情亦可參照官網
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_wait_timeout