org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned b
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使用mybatis分组查询，sql语句是：SELECT count(*) from t_parent_select_course sps LEFT JOIN t_school s ON sps.stu_schoolId=s.id
WHERE s.school_name LIKE '%小学%' AND sps.flag='1' GROUP BY sps.stu_schoolId;
但是我在代码中使用的是selectone()来接收，所以导致错误，原因是：查询方法中得到两个两个结果集,然而你的返回用了一个实体去接收，程序这个时候就不知道如何去分配了，所以报这个错，解决办法采用selectlist()接收。
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- org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned b
- org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned b
- Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be
- Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be
- mybatis中的一个异常：org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to
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- Expected one result (or null) to be returned by selectOne(), but found: 2
- Expected one result (or null) to be returned by selectOne(), but found
- Expected one result (or null) to be returned by selectOne(), but found: 2
- Expected one result (or null) to be returned by selectOne(), but found: 2
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- Expected one result (or null) to be returned by selectOne(), but found: XX
- 关于Expected one result (or null) to be returned by selectOne(), but found: 3。。。。异常
- Expected one result (or null) to be returned by selectOne(), but found: 4
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