Unknown initial character set index '255' received from server. Initial client character set can be
mysql的连接错误，在网上查找到是编码不匹配的原因， 直接在连接的URL后加上?useUnicode=true&characterEncoding=utf8就可以了 ...
原文：Unknown character set index for field '255' received from server.
MySQL 换成 . 后，Java JDBC jar包版本过低 需升级jar包 gt mysql connector java . . .jar或者更高，根据mysql版本决定 ...
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Unknown initial character set index '255' received from server. Initial client character 解决方法
Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property. 从错误 ...
【java报错】Unknown character set index for field '224' received from server.
'char%'可查看所有编码)，而mysql的jar包低版本不支持utf8mb4,连接时报错"Unknown ...
Unknown initial character set index '255' received from server
刚学mybatis，测试的时候有异常： 去检查数据库的数据，有汉字 就在url后面加上了"?characterEncoding=utf8"之后就可以正常显示了。 ...
Exception in thread "main" java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can
解决方法： ?useUnicode=true&characterEncoding=utf-8 在url路径上加上这句话 ...
java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via
解决方案： 首先查看数据库的版本号，删除旧的jar包，将mysql-connector-java.jar更换成对应版本号 同时在连接数据库的url后加上?useUnicode=true& ...
关于Javaweb中报错信息Cause: java.sql.SQLException: Unknown initial character set index '255' received from server.解决办法
这个报错信息意思是咱们的MySql和一个叫做mysql-connector-java包不匹配 一般来说5.1匹配的是mysql8.0以下的版本 8.0版本的mysql-connector- ...
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
在链接数据库的时候，报错如下： The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 上网 ...