mybatis mapper.xml中的返回類型報錯

原創 foreverlove_ty 2019-07-06 19:06

mapper.xml中的返回類型報錯

報錯日誌

2019-07-04 23:04:31,134 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.DispatcherServlet] - DispatcherServlet with name 'springMVC' processing POST request for [/CRM2/user/login.do]
  2019-07-04 23:04:31,149 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping] - Matching patterns for request [/user/login.do] are [/user/login.*]
  2019-07-04 23:04:31,152 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping] - URI Template variables for request [/user/login.do] are {}
  2019-07-04 23:04:31,160 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping] - Mapping [/user/login.do] to HandlerExecutionChain with handler [com.java1234.controller.UserController@6adb44b7] and 1 interceptor
  2019-07-04 23:04:31,248 [http-bio-8080-exec-5] DEBUG [org.springframework.web.bind.annotation.support.HandlerMethodInvoker] - Invoking request handler method: public java.lang.String com.java1234.controller.UserController.login(com.java1234.entity.User,javax.servlet.http.HttpServletRequest) throws java.lang.Exception
  2019-07-04 23:04:31,301 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Creating new transaction with name [com.java1234.service.impl.UserServiceImpl.login]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly
  2019-07-04 23:04:31,301 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DriverManagerDataSource] - Creating new JDBC DriverManager Connection to [jdbc:mysql://localhost:3306/db_crm2]
  2019-07-04 23:04:31,327 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Acquired Connection [com.mysql.jdbc.Connection@2f345808] for JDBC transaction
  2019-07-04 23:04:31,346 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Setting JDBC Connection [com.mysql.jdbc.Connection@2f345808] read-only
  2019-07-04 23:04:31,347 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Switching JDBC Connection [com.mysql.jdbc.Connection@2f345808] to manual commit
  2019-07-04 23:04:31,356 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Initiating transaction rollback
  2019-07-04 23:04:31,357 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Rolling back JDBC transaction on Connection [com.mysql.jdbc.Connection@2f345808]
  2019-07-04 23:04:31,358 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Resetting read-only flag of JDBC Connection [com.mysql.jdbc.Connection@2f345808]
  2019-07-04 23:04:31,358 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Releasing JDBC Connection [com.mysql.jdbc.Connection@2f345808] after transaction
  2019-07-04 23:04:31,358 [http-bio-8080-exec-5] DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Returning JDBC Connection to DataSource
  2019-07-04 23:04:31,364 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver] - Resolving exception from handler [com.java1234.controller.UserController@6adb44b7]: org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long
  2019-07-04 23:04:31,368 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver] - Resolving exception from handler [com.java1234.controller.UserController@6adb44b7]: org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long
  2019-07-04 23:04:31,368 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver] - Resolving exception from handler [com.java1234.controller.UserController@6adb44b7]: org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long
  2019-07-04 23:04:31,371 [http-bio-8080-exec-5] DEBUG [org.springframework.web.servlet.DispatcherServlet] - Could not complete request
  org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long
	at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementResultMap(MapperBuilderAssistant.java:373)
	at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:311)
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:104)
	at org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:698)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:668)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:663)
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:175)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)
	at com.sun.proxy.$Proxy12.login(Unknown Source)
	at com.java1234.service.impl.UserServiceImpl.login(UserServiceImpl.java:23)
	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:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
	at com.sun.proxy.$Proxy15.login(Unknown Source)
	at com.java1234.controller.UserController.login(UserController.java:41)
	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:498)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.java1234.dao.UserDao.Long
	at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:797)
	at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:550)
	at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementResultMap(MapperBuilderAssistant.java:371)
	... 65 more
2019-07-04 23:04:31,393 [http-bio-8080-exec-5] DEBUG [org.springframework.beans.factory.support.DefaultListableBeanFactory] - Returning cached instance of singleton bean 'sqlSessionFactory'
  七月 04, 2019 11:04:31 下午 org.apache.catalina.core.StandardWrapperValve invoke
嚴重: Servlet.service() for servlet [springMVC] in context with path [/CRM2] threw exception [Request processing failed; nested exception is org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long] with root cause
java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.java1234.dao.UserDao.Long
	at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:797)
	at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:550)
	at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementResultMap(MapperBuilderAssistant.java:371)
	at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:311)
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:104)
	at org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:698)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:668)
	at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:663)
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:175)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)
	at com.sun.proxy.$Proxy12.login(Unknown Source)
	at com.java1234.service.impl.UserServiceImpl.login(UserServiceImpl.java:23)
	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:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
	at com.sun.proxy.$Proxy15.login(Unknown Source)
	at com.java1234.controller.UserController.login(UserController.java:41)
	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:498)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

報錯點與解釋

Could not complete request
org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long

nested exception is org.apache.ibatis.builder.IncompleteElementException: Could not find result map com.java1234.dao.UserDao.Long] with root cause
java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.java1234.dao.UserDao.Long

大意是result map不能發現可以包含Long的值

錯誤原因

錯誤寫法

<select id="find" parameterType="Map" resultMap="UserResult">
		select * from t_user
		<where>
			<if test="userName!=null and userName!='' ">
				and userName like #{userName}
			</if>
		</where>
		<if test="start!=null and size!=null ">
			limit #{start},#{size}
		</if>
</select>

<select id="getTotal" parameterType="Map" resultMap="Long">
		select count(*) from t_user
		<where>
			<if test="userName!=null and userName!='' ">
				and userName like #{userName}
			</if>
		</where>
		<if test="start!=null and size!=null ">
			limit #{start},#{size}
		</if>
	</select>

正確寫法

<select id="find" parameterType="Map" resultMap="UserResult">
		select * from t_user
		<where>
			<if test="userName!=null and userName!='' ">
				and userName like #{userName}
			</if>
		</where>
		<if test="start!=null and size!=null ">
			limit #{start},#{size}
		</if>
</select>

<select id="getTotal" parameterType="Map" resultType="Long">
		select count(*) from t_user
		<where>
			<if test="userName!=null and userName!='' ">
				and userName like #{userName}
			</if>
		</where>
		<if test="start!=null and size!=null ">
			limit #{start},#{size}
		</if>
	</select>

其中

<select id="getTotal" parameterType="Map" resultType="Long">

resultType被我寫成了resultMap，因爲偷懶了，我是直接從上面find的方法中copy的。。。特地檢討一下

結論

結論：resultMap是針對自定義引用，如自定義對象類型的，resultType是針對基本數據類型的

參考

https://www.jianshu.com/p/fd3bdcde90fe
https://blog.csdn.net/zengdeqing2012/article/details/50978682
解釋
https://blog.csdn.net/w10251431/article/details/84545045
https://www.cnblogs.com/coder-lzh/p/8960928.html

PS

1、此代碼用的是java1234知識分享網的代碼（本身沒有問題），我仿寫的時自己出了問題，如果涉及侵權，可以聯繫本人刪除
2、比較坑的是如果某個標籤沒有這個resultMap對應的類型或類型錯誤，即使還沒用到這個<select id=“getTotal” 標籤方法，項目也會報錯，mybatis是全掃描這些xml的，導致有時候不好快速定位，所以要細心，好好檢查，此處僅僅是作爲個人的學習記錄，尚未細緻研究原理與細節，可能不具備參考意義，如有大神路過，隨意指導，隨意噴

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foreverlove_ty 2019-07-07 19:09:49