数据库连接报错解决方法：java.sql.SQLException: Unknown character set index for field '255' received from server.
启动Java项目是报出 java.sql.SQLException: Unknown character set index for field '255' received from server.的错误该怎么办 1.首先 出现这个问题的原因是因为我之前使用的是 Mysql 5.7版本，目前数据库迁移到了 8.0.15上面 因为Jar包版本太低所以出现了错误 2.去官网下载对应的Jar包
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