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有个常见的场景：删除用户的时候需要先删除用户的外键关联数据，否则会触发规则报错。
解决办法不外乎有三个：
1、多条sql分批执行；
2、存储过程或函数调用；
3、sql批量执行。
今天我要说的是MyBatis中如何一次执行多条语句(使用mysql数据库)。
1、修改数据库连接参数加上allowMultiQueries=true，如：
hikariConfig.security.jdbcUrl=jdbc:mysql://xx.xx.xx:3306/xxxxx?characterEncoding=utf-8&autoReconnect=true&failOverReadOnly=false&allowMultiQueries=true
2、直接写多条语句，用“；”隔开即可
delete from sec_user_role where userId=#{id};
delete from sec_user where id=#{id};
仅此而已~
补充知识：【MyBatis】动态SQL——foreach使用 /批量更新或批量插入
1.foreach的主要用在构建in条件中，它可以在SQL语句中进行迭代一个集合
2.可以传递一个 List 实例或者数组作为参数对象传给 MyBatis。当你这么做的时候，MyBatis 会自动将它包装在一个 Map
中，用名称作为键。List 实例将会以“list”作为键，而数组实例将会以“array”作为键
3.foreach的collection能够支持的三种集合类型list，array以及map
4.foreach元素的属性
