MyBatis的TooManyResultsException异常的解决办法
今日再开发遇到了这样的一个异常：Expected one result (or null) to be returned by selectOne(), but found: 2
详细的异常信息如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | 2017-03-3115:44:24,640ERROR method:com.baikeyang.bapi.modules.user.service.impl.LoginServiceImpl.login(LoginServiceImpl.java:156)-用户登录时发生异常 org.mybatis.spring.MyBatisSystemException:nested exception isorg.apache.ibatis.exceptions.TooManyResultsException:Expected one result(ornull)tobe returned by selectOne(),but found:2 at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:76) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:399) at com.sun.proxy.$Proxy13.selectOne(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:165) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:43) at com.sun.proxy.$Proxy14.selectAlarmCountData(Unknown Source) at com.baikeyang.bapi.modules.alarm.service.impl.AlarmServiceImpl.getAlarmCountData(AlarmServiceImpl.java:25) at com.baikeyang.bapi.modules.user.service.impl.LoginServiceImpl.getAlarmCountData(LoginServiceImpl.java:185) at com.baikeyang.bapi.modules.user.service.impl.LoginServiceImpl.login(LoginServiceImpl.java:131) at com.baikeyang.bapi.web.controller.LoginController.login(LoginController.java:39) at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) at javax.servlet.http.HttpServlet.service(HttpServlet.java:643) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.baikeyang.bapi.filter.MethodFilter.doFilter(MethodFilter.java:66) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:610) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1777) at java.lang.Thread.run(Thread.java:662) Caused by:org.apache.ibatis.exceptions.TooManyResultsException:Expected one result(ornull)tobe returned by selectOne(),but found:2 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66) at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386) ...48more |
从上面的异常信息，可以了解到下面两种情况：
1.你想查询一条数据，但返回两条数据：
2.你想查询多条数据，但是前台限制只能查询一条
(1) 检查自己的数据sql语句写对没有（关于mybaties的sql操作自己百度）
(2) 查看mybaties的返回值（resultType或resultMap），可以返回list，map等数据
(3) dao层接口要与mybaties中返回值和接收值都要保持一致
例：返回map数据
返回多条数据是多个Map，多个Map放在List中用List<Map<String,String>>接收返回数据
Mybatis返回的Map是这样的一种格式：Map<字段名称，字段值>
一个Map<字段名，字段值>对象代表一行数据
原解决方法博文地址：http://www.cnblogs.com/zcleilei/p/6245617.html
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