Unknown character set index for field '255' received from server.
連接數據庫時，出現Unknown character set index for field '255' received from server. 原因是MySQL版本高，mysql的jar版本低造成mysql與jar的編碼錯亂引起的，我的MYSQL是8.0版本 MYSQL 5.5 之前， UTF8 編碼只支持1-3個字節;從MYSQL5.5開始，可支持4個字節UTF編碼utf8mb4; 如em
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