1. 首頁
  2. 問答
  3. 重複條目上一對多

重複條目上一對多

2014-02-21 37 views
1 
@Component 
    @Entity 
    public class Parent { 

     private Long id; 

     private List<Child> reviews = new ArrayList<Child>(); 

     @Id 
     @GeneratedValue(generator="increment") 
     @GenericGenerator(name="increment", strategy="increment") 
     public Long getId() { 
      return id; 
     } 

     public void setId(Long id) { 
      this.id = id; 
     } 

     @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL) 
     @OrderBy("commentRating DESC") 
     public List<Child> getchildren() { 
      return children; 
     } 


     public void setChildren(List<Child> children) { 
      this.children = children; 
     } 

     public void addChild() { 
      getChildren().add(new Child(this.id)); 

     } 

    } 


    @Component 
    @Entity 
    public class Child { 

     private List<ChildChild> children = new ArrayList<ChildChild>(); 

     private long id; 

      private long parent_Id; 

     public Child(){} 

     public Child(long parentId) { 
       this.parentId = parentId; 
     } 

     @Id 
     @GeneratedValue(generator="increment") 
     @GenericGenerator(name="increment", strategy="increment") 
     public long getId() { 
      return id; 
     } 

     public void setId(long id) { 
      this.id = id; 
     } 

      public long getParentId() { 
       return parentId; 
      } 

      public void setParentId(long parentId) { 
       this.parentId = parentId; 
      } 

     @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL) 
     @IndexColumn(name="IDX") 
     public List<ChildChild> getChildren() { 
      return children; 
     } 

     public void setChildren(List<ChildChild> children) { 
      this.chidren = children; 
     } 

     public void addChild(String userName, String text) { 
      getChildren().add(new ChildChild(userName, text)); 
     } 

    } 

    @Component 
    @Entity 
    public class ChildChild { 

     private String userName; 
     private String text; 
     private long id; 

     public ChildChild() { 

     } 

     public ChildChild(String userName, String text) { 
      setUserName(userName); 
      setText(text); 
     } 

     @Column(columnDefinition="LONGTEXT") 
     public String getText() { 
      return text; 
     } 

     public void setText(String text) { 
      this.text = text; 
     } 

     public String getUserName() { 
      return userName; 
     } 

     public void setUserName(String userName) { 
      this.userName = userName; 
     } 

     @Id 
     @GeneratedValue(generator="increment") 
     @GenericGenerator(name="increment", strategy="increment") 
     public long getId() { 
      return id; 
     } 

     public void setId(long id) { 
      this.id = id; 
     } 

    }

後，我添加多個ChildChild任何兒童，然後嘗試添加新的父親，我收到了重複的條目'關鍵「childs_id」在桌子上PARENT_ID，childs_id。重複條目上一對多

只有一個ChildChild對任何孩子都沒問題。

我在這裏做出某種概念錯誤嗎？

堆棧跟蹤

SEVERE: Servlet.service() for servlet [myProgram] in context with path [/myProgram] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: Duplicate entry '2' for key 'childs_id'; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Duplicate entry '2' for key 'childs_id'] with root cause 
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2' for key 'childss_id' 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:534) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) 
    at com.mysql.jdbc.Util.getInstance(Util.java:386) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1040) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028) 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490) 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651) 
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2734) 
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155) 
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458) 
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375) 
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359) 
    at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:622) 
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122) 
    at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81) 
    at com.sun.proxy.$Proxy44.executeUpdate(Unknown Source) 
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:56) 
    at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1260) 
    at org.hibernate.action.internal.CollectionUpdateAction.execute(CollectionUpdateAction.java:80) 
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362) 
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:354) 
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:278) 
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) 
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) 
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1210) 
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:399) 
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101) 
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175) 
    at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:554) 
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754) 
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) 
    at com.sun.proxy.$Proxy32.addChild(Unknown Source) 
    at controllers.myProgram.addChild(myProgram.java:115) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:622) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:701)

來源

2014-02-21 AlyoshaKaramazov

+0

請使obove代碼編譯，發佈您正在執行的代碼以及您獲得的異常的完整堆棧跟蹤。 Child中的parent_id字段是什麼？ –

+0

你的整個'Child'類是錯誤的。我沒有看到'parentId'，'chidren'定義的任何地方。另外getter/setters對於'children'是錯誤的，我的眼睛真的很疼！ – Yogesh

+0

我已經更改了類的名稱，以使其更清晰。我的意思是ChildChild，而不是孩子的收藏。 – AlyoshaKaramazov

回答

0

您的代碼：

public void addChild() { 
    getReviews().add(new Review(this.id)); 
}

我想，應該是new Child(this.id)？

正確的方法是1）創建一個ChildChild，2）堅持它以便ID初始化，3）將它添加到Child。將Child添加到Parent也是如此。

來源

2014-02-21 12:09:25

+0

但我沒有問題添加許多孩子，因爲我想。只有當我向任何孩子添加多個ChildChild時，纔會發生錯誤。這將如何解釋這種行爲？ – AlyoshaKaramazov

+0

通過預先保留'ChildChild'，列表項目的ID就（正確）設置，並且對列表中的所有項目都不同。也許這種行爲是供應商特定的。 –

+0

如果是這樣，那麼爲什麼我只向Child添加一個ChildChild時纔會出錯？ – AlyoshaKaramazov

0

你應該告訴Hibernate你在你的OneToMany註解中使用了什麼。例如，

OneToMany(mappedBy="child")

此外，而不是引用在子類中PARENT_ID，你應該嘗試引用父實體對象的子類。

public void addChild() { 
     getChildren().add(new Child(this)); 
}

和您的孩子將有一個父字段。

private Parent parent;

來源

2014-02-21 14:35:36 Deepak

+0

爲什麼沒有mappedBy會導致這種行爲？在子類中引用父對象會首先破壞使用Hibernate的對象，不是嗎？ – AlyoshaKaramazov

+0

我認爲你問的是錯誤的問題。它不是「爲什麼要使用休眠」而是「如何使用休眠」的問題。 Hibernate要求你提供一個將定義映射列的列 – Deepak

相關問題

 相關問題