場景：mybatis動態拼接，批量添加數據，因為數據太多，憑借過多，導致MySql數據庫中插入大於1m的數據時，提示該異常。
解決辦法：修改mysql的屬性 max_allowed_packet即可。
修改辦法：打開mysql的根目錄，找到my.ini文件，再文件的[mysqld]下面添加一行max_allowed_packet = 20M，保存之后重啟mysql即可。
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