上一博客搭建了项目框架并集成了日志、mybatis、分页，并实现了用户表显示页面的分页，昨天把单个表的增删改查功能实现，并复制粘贴完成了角色表、权限表的增删改查，今天实现主子表一对多关系的页面维护。

一、问题解决

上一博客中使用spring集成pagehelper进行分页，但在使用的过程中会出现下面的bug，后来又改成了使用springboot集成的方式。

java.lang.NoSuchMethodError: org.apache.ibatis.reflection.MetaObject.forObject(Ljava/lang/Object;Lorg/apache/ibatis/reflection/factory/ObjectFactory;Lorg/apache/ibatis/reflection/wrapper/ObjectWrapperFactory;)Lorg/apache/ibatis/reflection/MetaObject;    at com.github.pagehelper.SqlUtil.forObject(SqlUtil.java:78) ~[pagehelper-3.4.2.jar:?]    at com.github.pagehelper.SqlUtil.getsqlSource(SqlUtil.java:517) ~[pagehelper-3.4.2.jar:?]    at com.github.pagehelper.SqlUtil.getMappedStatement(SqlUtil.java:440) ~[pagehelper-3.4.2.jar:?]    at com.github.pagehelper.SqlUtil.processCountMappedStatement(SqlUtil.java:143) ~[pagehelper-3.4.2.jar:?]    at com.github.pagehelper.PageHelper.intercept(PageHelper.java:140) ~[pagehelper-3.4.2.jar:?]    at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61) ~[mybatis-3.4.6.jar:3.4.6]    at com.sun.proxy.$Proxy84.query(Unknown Source) ~[?:?]    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) ~[mybatis-3.4.6.jar:3.4.6]    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) ~[mybatis-3.4.6.jar:3.4.6]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_201]    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_201]    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) ~[mybatis-spring-1.3.2.jar:1.3.2]    at com.sun.proxy.$Proxy71.selectList(Unknown Source) ~[?:?]    at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230) ~[mybatis-spring-1.3.2.jar:1.3.2]    at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139) ~[mybatis-3.4.6.jar:3.4.6]    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76) ~[mybatis-3.4.6.jar:3.4.6]    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) ~[mybatis-3.4.6.jar:3.4.6]    at com.sun.proxy.$Proxy72.getUsers(Unknown Source) ~[?:?]    at com.example.service.impl.UserServiceImpl.getUsers(UserServiceImpl.java:31) ~[classes/:?]    at com.example.controller.UserController.getUsers(UserController.java:94) ~[classes/:?]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_201]    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_201]    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) [tomcat-embed-core-9.0.16.jar:9.0.16]    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.16.jar:9.0.16]    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_201]    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_201]    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.16.jar:9.0.16]    at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]

去除上一博客分页引入的依赖，在pom.xml中引入pagehelper-spring-boot-starter依赖

              
                  
       
        com.github.pagehelper
                   
       
        pagehelper-spring-boot-starter
                   
       
        1.2.10
               
      

             
                 
      
       com.github.pagehelper
                  
      
       pagehelper-spring-boot-starter
                  
      
       1.2.10
              
     

在application.properties中设置pagehelper的属性，同时要去前面在mybatis-config.xml中pagehelper的配置。

#pagehelperpagehelper.helperDialect=mysqlpagehelper.reasonable=truepagehelper.support-methods-arguments=truepagehelper.params=count=countSql

二、父子表页面维护

数据库表有一对一、一对多、多对多的关系，用户与角色、角色与资源等，这里增加了两个中间表：user_role、role_permission表，既然有这两个表，就要对这两张表进行维护，那怎么维护，用户操作习惯是怎样，这个思考了好久，可能智者见智仁者见仁，这里以用户角色列下我实现的方式，先贴上实现的效果页面。

用户在用户表中点击选择角色会弹出图2底部的弹窗，显示已有的角色，点击添加角色时，会弹出图2顶部的弹窗，显示用户未关联的角色，用户可以选择角色点击添加按钮之后，在顶部会将选中的角色去除，选择完毕关闭顶部弹窗时会刷新底部弹窗，显示用户的角色。用户可以对关联角色进行删除。不难发现，上面的弹框表格样式与角色管理页面样式差不多，其实都是用的角色管理页面，两个弹窗的业务也都在一个js中，主要是因为我比较懒，不想再增加页面了。角色与权限的关系维护也与这个一样，复制粘贴用户角色的实现然后修改完成。

三、事务管理

主子表带来一个问题就是当删除主表数据时需要也要把子表关联的数据也删除，比如用户页面，删除用户就需要把用户与角色关联表中相应的用户数据也删除。在springboot处理事务只需要在main方法类中开启全局事务，然后在对应的类或方法上声明事务。

1.开启事务

在main方法类中使用@EnableTransactionManagement注解开启事务。

@ComponentScan(basePackages = {"com.example.*"})@SpringBootApplication@EnableTransactionManagement public class ManageApplication {    public static void main(String[] args) {        SpringApplication.run(ManageApplication.class, args);    }}

2.在类或方法上声明事务

使用@Transactional注解在类、方法上声明事务。删除用户的时候需要删除关联表中的角色信息，这里在删除用户的方法上声明了事务，为了测试事务，在删除关联表时抛出了RuntimeException异常。

@Override    @Transactional(propagation=Propagation.REQUIRED)     public Boolean delUser(String id) throws Exception {        String[]  ids=id.split(",");        if(ids.length>0)        {            userMapper.delUser(ids);            for(int i=0;i

用户编号001的用户关联的是有角色的，在点击删除时会报删除失败！

四、小结

目前已实现了3个单表用户表、角色表、权限表的增删改查以及两个用户角色、角色权限关联表的维护，后续就是了解shiro框架的使用和项目的优化重构。