權限管理系統之主子表頁面維護及事務處理

上一博客搭建了項目框架並集成了日誌、mybatis、分頁，並實現了用戶表顯示頁面的分頁，昨天把單個表的增刪改查功能實現，並複製粘貼完成了角色表、權限表的增刪改查，今天實現主子表一對多關係的頁面維護。

一、問題解決

上一博客中使用spring集成pagehelper進行分頁，但在使用的過程中會出現下面的bug，後來又改成了使用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]

View Code

去除上一博客分頁引入的依賴，在pom.xml中引入pagehelper-spring-boot-starter依賴

        <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.10</version>
        </dependency>

View Code

        <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.10</version>
        </dependency>

在application.properties中設置pagehelper的屬性，同時要去前面在mybatis-config.xml中pagehelper的配置。

#pagehelper
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.support-methods-arguments=true
pagehelper.params=count=countSql

二、父子表頁面維護

數據庫表有一對一、一對多、多對多的關係，用戶與角色、角色與資源等，這裏增加了兩個中間表：user_role、role_permission表，既然有這兩個表，就要對這兩張表進行維護，那怎麼維護，用戶操作習慣是怎樣，這個思考了好久，可能智者見智仁者見仁，這裏以用戶角色列下我實現的方式，先貼上實現的效果頁面。

用戶在用戶表中點擊選擇角色會彈出圖2底部的彈窗，顯示已有的角色，點擊添加角色時，會彈出圖2頂部的彈窗，顯示用戶未關聯的角色，用戶可以選擇角色點擊添加按鈕之後，在頂部會將選中的角色去除，選擇完畢關閉頂部彈窗時會刷新底部彈窗，顯示用戶的角色。用戶可以對關聯角色進行刪除。不難發現，上面的彈框表格樣式與角色管理頁面樣式差不多，其實都是用的角色管理頁面，兩個彈窗的業務也都在一個js中，主要是因爲我比較懶，不想再增加頁面了。角色與權限的關係維護也與這個一樣，複製粘貼用戶角色的實現然後修改完成。

三、事務管理

主子錶帶來一個問題就是當刪除主表數據時需要也要把子表關聯的數據也刪除，比如用戶頁面，刪除用戶就需要把用戶與角色關聯表中相應的用戶數據也刪除。在springboot處理事務只需要在main方法類中開啓全局事務，然後在對應的類或方法上聲明事務。

1.開啓事務

在main方法類中使用@EnableTransactionManagement註解開啓事務。

@ComponentScan(basePackages = {"com.example.*"})
@SpringBootApplication
@EnableTransactionManagement 
public class ManageApplication {

    public static void main(String[] args) {
        SpringApplication.run(ManageApplication.class, args);
    }

}

2.在類或方法上聲明事務

使用@Transactional註解在類、方法上聲明事務。刪除用戶的時候需要刪除關聯表中的角色信息，這裏在刪除用戶的方法上聲明瞭事務，爲了測試事務，在刪除關聯表時拋出了RuntimeException異常。

    @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<ids.length;i++)
            {
                delRoles(ids[i],"");
                throw new RuntimeException("註釋");
            }
        }        
        return true;
    }

用戶編號001的用戶關聯的是有角色的，在點擊刪除時會報刪除失敗！

四、小結

目前已實現了3個單表用戶表、角色表、權限表的增刪改查以及兩個用戶角色、角色權限關聯表的維護，後續就是了解shiro框架的使用和項目的優化重構。

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