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