com.mysql.jdbc.PacketTooBigException: Packet for query is too large (2054817 > 1048576). You can change this value on the server by setting the max_allowed_packet' variable. 原因：字段数据特别大 解决方法 ：在mysql.ini中增加或者修改（如max_allowed_packet=16M） （注意，在[client]和[mysql]部分增加无效，那个是客户端读取的参数。）
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