查询或插入的数据包大于MySQL默认设置
com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (12,131,066 > 4,194,304). You can change this value on the server by setting the 'max_allowed_packet' variable. ERROR 2020 (HY000): Got packet bigger than 'max_allowed_packet' bytes
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