mybatis一对多映射时始终不能正确映射到实体类，报错：Expected one result (or null) to be returned by selectOne()，but found:
写下这篇博客时真的是痛哭流涕啊，因为有个bug真的让我茶不思，饭不香一整天！那就是 TooManyResultsException: Expected one result (or null) to be returned by selectOne()，but found:13 它的意思就是mybatis期待返回的是一条数据，但实际返回了多条数据。 下面看我的实体类代码，书和章节是一对多关系，所以
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- 1. MyBatis报错：Expected one result (or null) to be returned by selectOne(), but found: 2
- 2. 解决:TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found:
- 3. Expected one result (or null) to be returned by selectOne(), but found: 2
- 4. BUG之Expected one result (or null) to be returned by selectOne(), but found: 4
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- 9. org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned
- 10. 关于Expected one result (or null) to be returned by selectOne(), but found: 3。。。。异常