mybatis 返回类型List 《Object[]》

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最新推荐文章于 2025-06-19 21:00:54 发布

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项目从JPA改版为MyBatis，解决List<Object[]>返回类型问题，通过修改返回类型为List<HashMap<String,Object>>，并调整Controller层获取数据方式，提高数据处理效率。

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项目从JPA改版mybatis

原方法有 List<Object[]> 返回类型的

1.首先resultMap="BaseResultMap"有问题，返回不了实体类以外的属性数据（比如count(*),sum...）

2.resultType="Map" 可以查询原sql数据，但controller层返回类型转换报错(注意是resultType="Map"，不是resultMap="Map")

java.lang.ClassCastException: java.util.Map cannot be cast to [Ljava.lang.Object;
    at com.isatk.yn.service.TaskManagerAllocationService.findTaskQueNumTechNum(TaskManagerAllocationService.java:558)
    at com.isatk.yn.service.TaskManagerAllocationService$$FastClassBySpringCGLIB$$1eb90db2.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:651)
    at com.isatk.yn.service.TaskManagerAllocationService$$EnhancerBySpringCGLIB$$6161d33.findTaskQueNumTechNum(<generated>)
    at com.isatk.yn.RedisTest.findTaskQueNumTechNum(RedisTest.java:48)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    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:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

需要修改原返回类型

// 原方法 List<Object[]> getTestQueDatas(HashMap<String, Object> map);
List<HashMap<String, Object>> getTestQueDatas(HashMap<String, Object> map);

然后controller层再更改一下取属性的方式即可。

总结：Object[]类型返回比较麻烦，且容易出问题，用HashMap<String, Object>类型代表比较好