场景：mybatis动态拼接，批量添加数据，因为数据太多，凭借过多，导致MySql数据库中插入大于1m的数据时，提示该异常。
解决办法：修改mysql的属性 max_allowed_packet即可。
修改办法：打开mysql的根目录，找到my.ini文件，再文件的[mysqld]下面添加一行max_allowed_packet = 20M，保存之后重启mysql即可。
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