org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found 解决方法

报错：org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'xxx'.  It's likely that neither a Result Type nor a Result Map was specified.

原因：这是因为使用到的sql查询语句没有返回一般数据类型的值，如下

修改后：加入返回类型 resultType="java.lang.Long"，如下

这样问题就解决啦