SQLSTATE[40001]: senalization failure 1213 deadlock found when trying to get lock, try restarting transaction (SQL: UPDATE ...)

网上找的答案
https://www.cnblogs.com/doseoer/p/10325596.html

官方文档
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks-handling.html

SQLSTATE[HY000] [2002] Connection refused

前端反馈测服偶尔出现这个错误
参考了网上很多答案, 很多人说把配置文件里面的localhost改为127.0.0.1就可以了, 也许吧

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