MySQL 換成 8.0后，Java JDBC jar包版本過低
需升級jar包----->mysql-connector-java-5.1.46.jar或者更高，根據mysql版本決定
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Unknown initial character set index '255' received from server. Initial client character set can be
Unknown initial character set index '255' received from server. Initial client character 解決方法
【java報錯】Unknown character set index for field '224' received from server.
Unknown initial character set index '255' received from server
Exception in thread "main" java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.解決方案
關於Javaweb中報錯信息Cause: java.sql.SQLException: Unknown initial character set index '255' received from server.解決辦法
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.