Mybatis TooManyResultsException

最新推荐文章于 2023-09-19 16:17:39 发布

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最新推荐文章于 2023-09-19 16:17:39 发布

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本文详细解析了在使用MyBatis框架时遇到的TooManyResultsException异常，此异常源于期望通过selectOne()方法获取单一结果，但实际返回了多个结果的情况。文章深入探讨了异常原因，并提供了可能的解决方案。

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org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 16    
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)    
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:346)    
at $Proxy11.selectOne(Unknown Source)    
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:154)    
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)    
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:38)    
at $Proxy14.selectMusicByGeshou(Unknown Source)    
at test.karaoke.TestKaraoke.testGeShou(TestKaraoke.java:72)    
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)    
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    
at java.lang.reflect.Method.invoke(Method.java:597)   
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)    
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)    
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)    
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)    
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)    
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)    
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)    
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)    
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)    
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)    
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)    
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)    
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)    
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)    
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)    
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)    
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)    
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)    
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)    
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)    
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)    
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)    
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)    
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 16    
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:42)    
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)    
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    
at java.lang.reflect.Method.invoke(Method.java:597)    
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:338)    
... 34 more

<select id="selectMusicByGeshou" parameterType="int" resultMap="com.ltkj.zhepg.karaoke.mapper.MusicMediaMapper.musicMediaResult">		
select * from ok_music_media where geshou_id= #{geshouId}	
</select>

1. mybatis的返回值与dao层方法的返回值不一致

2. mybatis查出来的数据长度 > 1,但是却用了实体类来接收