Host 'IP' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
链接次数过多，IP被锁定了，不让链接了
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解决方案参考
https://zhuanlan.zhihu.com/p/677011711
看下你的jdbc驱动版本
[平台]MySQL数据连接 https://help.fanruan.com/finereport/doc-view-2560.html
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