FAQ（14）：Could not find result map com.smbms.entities.User

最新推荐文章于 2019-09-02 09:21:44 发布

原创最新推荐文章于 2019-09-02 09:21:44 发布 · 350 阅读

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本文详细解析了 MyBatis 中 resultMap 和 resultType 的区别，并通过一个具体的错误案例说明了如何正确使用这两个属性来避免运行时异常。

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mybatis的实体类与mapper.xml文件是对应映射关系的，因此由其要注意标签sql的属性要配置正确哦！！

org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.smbms.entities.User
	at org.apache.ibatis.builder.MapperBuilderAssistant.getStatementResultMaps(MapperBuilderAssistant.java:346)
	at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:278)
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109)
	at org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:760)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:730)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:725)
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:210)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:48)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:59)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
	at com.sun.proxy.$Proxy4.UserByUsername(Unknown Source)
	at com.smbms.entities.UserTest.test03(UserTest.java:69)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	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.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	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$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.smbms.entities.User
	at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:860)
	at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:612)
	at org.apache.ibatis.builder.MapperBuilderAssistant.getStatementResultMaps(MapperBuilderAssistant.java:344)
	... 34 more

解决：粗心大意！
原：使用select<>标签时，不注意resultType 和 resultMap的区别，快捷键的害处！！

	<select id="UserByUsername" resultMap="com.smbms.entities.User" parameterType="string">
		select * from smbms_user where username like CONCAT('%',#{username},'%')
	</select>

改：

	<select id="UserByUsername" resultType="com.smbms.entities.User" parameterType="string">
		select * from smbms_user where username like CONCAT('%',#{username},'%')
	</select>