MyBatis中，出现Unknown column的提示是mapper.xml中的数据库字段写错了。

错误示例：

XxMapper.xml中

 <sql id="KnowlegeSectionAndPart_Column_List">

    s.knowledge_section_id, s.create_time, s.update_time, s.section_name,

    s.repository_id, s.bool_close, p.knowlege_part_id, p.create_time,

    p.update_time, p.repository_id, p.section_id, p.bool_close, p.part_name

    </sql>
<!--    通过章id查询章及其节-->

    <select id="getKnowlegeSectionWithPartDOById" parameterType="java.lang.Long"

            resultMap="KnowlegeSectionWithPartResultMap">

        select

        <include refid="KnowlegeSectionAndPart_Column_List"/>

        from knowlege_section s

        where s.knowledge_section_id = #{sid,jdbcType=BIGINT}

    </select>

报错：

 ### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'p.knowlege_part_id' in 'field list'

 ### The error may exist in file [D:\IDEACode\YiZhiDu\ChangJiangRiver\target\chang_jiang_river\WEB-INF\classes\com\hzy\mapper\KnowlegeSectionDOMapper.xml]

 ### The error may involve com.hzy.dao.KnowlegeSectionDOMapper.getKnowlegeSectionWithPartDOById-Inline

 ### The error occurred while setting parameters

 ### SQL: select               s.knowledge_section_id, s.create_time, s.update_time, s.section_name, s.repository_id, s.bool_close,p.knowlege_part_id, p.create_time, p.update_time, p.repository_id, p.section_id, p.bool_close, p.part_name               from knowlege_section s         where s.knowledge_section_id = ?

 ### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'p.knowlege_part_id' in 'field list'

 ; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'p.knowlege_part_id' in 'field list'] with root cause

     com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'p.knowlege_part_id' in 'field list'

         at 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:404)

         at com.mysql.jdbc.Util.getInstance(Util.java:387)

         at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:939)

         at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)

         at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)

         at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)

         at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)

         at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)

         at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)

         at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)

         at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:67)

         at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:59)

         at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)

         at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)

         at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)

         at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)

         at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)

         at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)

         at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:60)

         at com.sun.proxy.$Proxy67.query(Unknown Source)

         at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)

         at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)

         at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)

         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:386)

         at com.sun.proxy.$Proxy24.selectOne(Unknown Source)

         at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:165)

         at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)

         at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)

         at com.sun.proxy.$Proxy25.getKnowlegeSectionWithPartDOById(Unknown Source)

         at com.hzy.knowlege.impl.KnowlegeServiceImpl.getKnowlegeSectionWithPartDOById(KnowlegeServiceImpl.java:100)

         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:99)

         at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)

         at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

         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.$Proxy28.getKnowlegeSectionWithPartDOById(Unknown Source)

         at com.hzy.controller.KnowlegeController.getKnowlegeSectionWithPartById(KnowlegeController.java:122)

         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: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:966)

         at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)

         at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)

         at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)

         at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

         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:53)

         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:87)

         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:77)

         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:85)

         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:202)

         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

         at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)

         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

         at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)

         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)

         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

         at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)

         at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

         at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)

         at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)

         at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

         at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

         at java.lang.Thread.run(Thread.java:745)

修改（添加 knowlege_part p）：

 <!--    通过章id查询章及其节-->

    <select id="getKnowlegeSectionWithPartDOById" parameterType="java.lang.Long"

            resultMap="KnowlegeSectionWithPartResultMap">

        select

        <include refid="KnowlegeSectionAndPart_Column_List"/>

        from knowlege_section s, knowlege_part p

        where s.knowledge_section_id = #{sid,jdbcType=BIGINT}

    </select>

回调成功：

总结：

所有被查询的字段，如果数据库表有别名，那么对应的字段也必须有别名，反之亦然。

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