Mybatis什么时候用resultMap,什么时候用resultType

今早上在用Mybatis的时候遇到了多表查询,一直用的resultType,以前的话都是把返回的实体bean里面添加两个表所有的字段,当然这样写的弊端很大的,很多没用的字段也查询出来了,然后早上百度了一下myBatis的多表查询,发现了有个resultType可以来解决(以前上学的时候学过,但是一直不理解,哈哈),废话不多说直接上代码
这是我的sql查询语句

<select id="findDeviceByUserid" resultMap="deviceTrailResultMap"parameterType="java.lang.Integer">selectd.iot,online,name,phone,pic,adress,creattime,opinion,groupid,userid,lon, lat, d.dwfs, longitude, latitude, timefrom device d left join trail t on d.iot=t.iotwhere userid=#{userid} order by time desc limit 1</select>

以往都用的resultType,然后返回值类型直接写实体bean,这次改成了resultMap,既然引入resultMap,就需要写个resultMap咯,下面是我写的ResultMap

<resultMap type="device" id="deviceTrailResultMap"><id property="id" column="id" /><result property="iot" column="iot" /><result property="online" column="online" /><result property="name" column="name" /><result property="phone" column="phone" /><result property="pic" column="pic" /><result property="adress" column="adress" /><result property="creattime" column="creattime" /><result property="opinion" column="opinion" /><result property="groupid" column="groupid" /><result property="userid" column="userid" /><result property="lon" column="lon" /><result property="lat" column="lat" /><result property="dwfs" column="dwfs" /><collection property="trail" ofType="Trail"><id property="id" column="id" /><result property="iot" column="iot" /><result property="longitude" column="longitude" /><result property="latitude" column="latitude" /><result property="time" column="time" /></collection></resultMap>

这个resultMap需要解释几个地方,懒得在代码上写备注了,就这么随便讲讲吧,这里面有几个地方需要注意,这里面的type就是你要回查询的第一表的实体bean,id就是sql语句面的那个resultMap对应的名字,column就是数据库中的表的名字,property这个就是你实体中的字段名字,collection 对应的另外一张表,可以有多个,两张表用一个这个,三张表就用两个,以此类推,oftype指定的是映射到list集合属性中实体的类型,然后直接运行,然后报错,如下

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'dwfs' in field list is ambiguous
; ]; Column 'dwfs' in field list is ambiguous; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'dwfs' in field list is ambiguous] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'dwfs' in field list is ambiguousat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.Util.getInstance(Util.java:408)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486)at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1197)at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3051)at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3049)at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167)at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:498)at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy82.query(Unknown Source)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)at com.sun.proxy.$Proxy66.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)at com.sun.proxy.$Proxy85.findDeviceByUserid(Unknown Source)at com.xckj.gps.service.DeviceService.findDeviceByUserid(DeviceService.java:35)at com.xckj.gps.controller.DeviceController.findDeviceByUserid(DeviceController.java:109)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.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)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)

好吧,我的失误,实体bean里面少个字段,然后添加这个字段,然后继续运行

org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'trail' in 'class com.xckj.gps.entity.Device'at org.apache.ibatis.reflection.Reflector.getGetInvoker(Reflector.java:419)at org.apache.ibatis.reflection.MetaClass.getGetInvoker(MetaClass.java:164)at org.apache.ibatis.reflection.wrapper.BeanWrapper.getBeanProperty(BeanWrapper.java:162)at org.apache.ibatis.reflection.wrapper.BeanWrapper.get(BeanWrapper.java:49)at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:122)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.instantiateCollectionPropertyIfAppropriate(DefaultResultSetHandler.java:1129)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyNestedResultMappings(DefaultResultSetHandler.java:961)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:918)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForNestedResultMap(DefaultResultSetHandler.java:881)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:303)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:196)at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy82.query(Unknown Source)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)at com.sun.proxy.$Proxy66.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)at com.sun.proxy.$Proxy97.findDeviceByUserid(Unknown Source)at com.xckj.gps.service.DeviceService.findDeviceByUserid(DeviceService.java:35)at com.xckj.gps.controller.DeviceController.findDeviceByUserid(DeviceController.java:109)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.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)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)

哈哈,有报错了,这次提示,找不到trail这个集合,也就是在关联表的时候,没找到要关联的表,嗯,来看下我的实体bean

@Data
public class Device {public Integer id;public String iot;public String online;public String name;public String phone;public String pic;public String adress;public String opinion;public Date creattime;public Integer groupid;public Integer userid;public Integer hidden;public Double lon;public Double lat;public String power;public int dwfs;}

哦哦,果然没有那个List集合的trail,好的那我们加上去看看结果


@Data
public class Device {public Integer id;public String iot;public String online;public String name;public String phone;public String pic;public String adress;public String opinion;public Date creattime;public Integer groupid;public Integer userid;public Integer hidden;public Double lon;public Double lat;public String power;public int dwfs;private List<Trail> trail;
}

嗯,现在加上去了,这里有人问志伟,你咋不谢get,set啊,嗯,lombok了解一下,这里就不多说那个了,然后我们运行下我们的代码

10:24:12.696 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/findTrail]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.TrailController.findTrail(com.xckj.gps.entity.Dog) throws java.lang.Exception
10:24:12.699 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/addUser]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.addUser(com.xckj.gps.entity.User)
10:24:12.699 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/deleteUser]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.deleteUser(java.lang.Integer)
10:24:12.699 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/findUser]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.findUser(java.lang.String)
10:24:12.699 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/saveUser]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.saveUser(com.xckj.gps.entity.User)
10:24:12.699 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/login]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.login(com.xckj.gps.entity.User)
10:24:12.700 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/findUserCount]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.findUserCount()
10:24:12.700 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/user/modify]}" onto public com.xckj.gps.config.Response com.xckj.gps.controller.UserController.modify(com.xckj.gps.entity.User)
10:24:12.702 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
10:24:12.703 [restartedMain] INFO  org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
10:24:12.740 [restartedMain] INFO  org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
10:24:12.740 [restartedMain] INFO  org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
10:24:13.123 [restartedMain] INFO  org.springframework.boot.devtools.autoconfigure.OptionalLiveReloadServer - LiveReload server is running on port 35729
10:24:13.157 [restartedMain] INFO  org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Registering beans for JMX exposure on startup
10:24:13.158 [restartedMain] INFO  org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Bean with name 'statFilter' has been autodetected for JMX exposure
10:24:13.158 [restartedMain] INFO  org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Bean with name 'dataSource' has been autodetected for JMX exposure
10:24:13.164 [restartedMain] INFO  org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Located MBean 'dataSource': registering with JMX server as MBean [com.alibaba.druid.spring.boot.autoconfigure:name=dataSource,type=DruidDataSourceWrapper]
10:24:13.164 [restartedMain] INFO  org.springframework.jmx.export.annotation.AnnotationMBeanExporter - Located MBean 'statFilter': registering with JMX server as MBean [com.alibaba.druid.filter.stat:name=statFilter,type=StatFilter]
10:24:13.175 [restartedMain] INFO  org.apache.coyote.http11.Http11NioProtocol - Starting ProtocolHandler ["http-nio-1423"]
10:24:13.187 [restartedMain] INFO  org.apache.tomcat.util.net.NioSelectorPool - Using a shared selector for servlet write/read
10:24:13.203 [restartedMain] INFO  org.springframework.boot.web.embedded.tomcat.TomcatWebServer - Tomcat started on port(s): 1423 (http) with context path ''
10:24:13.206 [restartedMain] INFO  com.xckj.gps.GpsApplication - Started GpsApplication in 4.5 seconds (JVM running for 5.156)

嗯,完美的跑起来了,那我们用postman测试下我们的结果

{"code": 0,"msg": "成功","data": [{"id": null,"iot": "201807271436000213","online": "1","name": "智能狗链子","phone": "15738323661","pic": "img/gps/dog.png","adress": "航海路经开第二大街兴华大厦","opinion": "0","creattime": "2018-07-27T06:38:22.000+0000","groupid": 1,"userid": 49,"hidden": null,"lon": 113.736,"lat": 34.73,"power": null,"dwfs": 2,"trail": [{"iot": "201807271436000213","longitude": 113.736,"latitude": 34.73,"time": "2018-11-15T06:00:38.000+0000","dwfs": 0}]}]
}

嗯,得到了我想要的数据了,最新的一条设备和轨迹信息,就写到这里吧,呼呼

Mybatis什么时候用resultMap,什么时候用resultType相关推荐

Mybatis中强大的resultMap
本文来说下mybatis中的resultMap,在平时的开发中resultType使用的比较多.resultType在解决一对一的关系时候比较方便,但是在设计到多对多的时候,使用resultMap比较 ...
关于mybatis中mapper文件resultMap中collection和association的使用
mybatis mapper配置文件结果集映射resultMap中collection属性(一对多关系结果集映射)和association属性(多对一关系结果集映射)理解: collection的使用 ...
SSM—mybatis框架-结果处理-resultMap定义-association-collection
文章目录 1.结果处理 1.1.简单类型输出映射! 1.2.pojo对象输出映射! 1.3.定义resultMap 1.4.resultMap使用(association,collection)注意! ...
6.2 、MyBatis 高级映射（resultMap 标签多表联查，一对多，多对一关系）
文章目录一.创建表结构,添加数据,实现表中数据的关联关系二. association 标签:用于一对一.多对一场景使用 1.实现一对一,多对一关系结果集映射 1.1 按照查询嵌套处理 1.2 按照 ...
MyBatis魔法堂：ResultMap详解
一.前言 MyBatis是基于"数据库结构不可控"的思想建立的,也就是我们希望数据库遵循第三范式或BCNF,但实际事与愿违,那么结果集映射就是MyBatis为我们提供这种理想与 ...
mybatis学习2之ResultMap结果集映射
前言当实体类的属性和数据库的字段无法对应时我们改怎么办呢? 这里我们一起来学习ResultMap结果映射集 1.ResultMap是什么? resultMap元素用来描述如何将结果集映射到Java对 ...
mybatis元素类型为 “resultMap“ 的内容必须匹配 “(constructor?,id *,result*,association报错解决
1.前言太久没写这种套娃式的sql语句了,导致今天一写,直接给我整了个报错. 原因其实蛮简单的,mybatis的xml中的resultMap标签规定了内标签的顺序,写错了就会直接解析不出来,从而报错 ...
Mybatis 高级结果映射 ResultMap Association Collection
来源:http://www.verydemo.com/demo_c152_i1880.html MyBatis的创建基于这样一个思想:数据库并不是您想怎样就怎样的.虽然我们希望所有的数据库遵守第三范式 ...
MyBatis总结六：resultMap详解(包含多表查询)
From: https://www.cnblogs.com/Alex-zqzy/p/9296039.html 简介: MyBatis的每一个查询映射的返回类型都是ResultMap,只是当我们提供的返 ...
Mybatis中查询结果resultMap使用分析
本文章将讲述: mybatis resultMap 标签的作用 resultMap 标签中子标签 result 的使用分析 resultMap 标签中主键标签 id 的使用分析 resultMap ...

Mybatis什么时候用resultMap,什么时候用resultType

Mybatis什么时候用resultMap,什么时候用resultType相关推荐

最新文章

热门文章