Question

当我尝试删除ExternalDataStorage时此查询抛出一个约束违规异常，约束名为null .ExternalDataStorage上没有关系映射。查询首先检查哪些包含ExternalDataStorage（将被删除）的ExternalTasks在ExternalTask的externalsources List和从列表中删除，如果列表为空，则删除externaltask，最后删除ExternalDataStorage实体（目标实体）。

      public boolean deleteExternalDataStorage(Long sid) {
     EntityManager em = getEntityManager();
    EntityTransaction et = em.getTransaction();
    try {
        et.begin();
        ExternalDataStorage s = em.find(ExternalDataStorage.class, sid);
        List<ExternalTask> tasks = (List<ExternalTask>) em.createQuery("SELECT t FROM ExternalTask t ").getResultList();
        for (ExternalTask t : tasks) {
            if (t.getExternalSources().contains(s)) {
                t.getExternalSources().remove(s);
                if (t.getExternalSources().isEmpty()) {
                    em.remove(t);
                } else {
                    t = em.merge(t);
                }
            }
        }
        em.remove(s);
        et.commit();
        return true;
    } catch (Exception e) {
        e.printStackTrace();


    } finally {
        if (et.isActive()) {
            et.rollback();
        }
    }
    return false;
}

@Entity 公共类ExternalTask实现Serializable {

@ManyToMany(cascade={CascadeType.MERGE,CascadeType.PERSIST,CascadeType.REFRESH})
@JoinTable(name = "ExternalTask_ExternalSource", joinColumns = @JoinColumn(name = "TID"), inverseJoinColumns = @JoinColumn(name = "EXID"))
private  List<ExternalDataStorage> externalSources =new ArrayList<ExternalDataStorage>();


@ManyToMany(cascade={CascadeType.MERGE,CascadeType.PERSIST,CascadeType.REFRESH})
@JoinTable(name = "ExternalTask_Archive", joinColumns = @JoinColumn(name = "TID"), inverseJoinColumns = @JoinColumn(name = "AID"))
protected  List<Archive> archives=new ArrayList<Archive>();


@ManyToOne
private User  ownerUser;

的的 _ 修改的 _ __ _ < / EM> __ _ __ _ __ _ __ _ ___

我为删除案例稍微更改了查询但问题仍然存在

EntityManager em = getEntityManager(); EntityTransaction et = em.getTransaction(); try { et.begin(); ExternalDataStorage s = em.find(ExternalDataStorage.class, sid); List<ExternalTask> tasks=(List<ExternalTask>) em.createQuery("SELECT t FROM ExternalTask t ").getResultList(); for(ExternalTask t:tasks) { if(t.getExternalSources().contains(s)){ t.getExternalSources().remove(s); t= em.merge(t); if(t.getExternalSources().isEmpty()){ em.remove(t); } } } em.remove(s); et.commit(); return true; } catch (Exception e) { e.printStackTrace(); } finally { if (et.isActive()) { et.rollback(); } } return false; }

这是例外

**377249 [http-8080-2] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null 377249 [http-8080-2] ERROR org.hibernate.util.JDBCExceptionReporter - Batch entry 0 delete from ExternalSource where EXID=6 was aborted. Call getNextException to see the cause. 377249 [http-8080-2] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 23503 377249 [http-8080-2] ERROR org.hibernate.util.JDBCExceptionReporter - ERROR: update or delete on table "externalsource" violates foreign key constraint "fk755287f526733b01" on table "externaltask_externalsource" Detail: Key (exid)=(6) is still referenced from table "externaltask_externalsource". 377250 [http-8080-2] ERROR org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:249) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106) at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54) at com.endersys.itap.ui.module.storage.StorageManager.deleteExternalDataStorage(StorageManager.java:351) at com.endersys.itap.ui.module.storage.ExternalDataStorageEditorBean.delete(ExternalDataStorageEditorBean.java:73) 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:616) at org.apache.el.parser.AstValue.invoke(AstValue.java:172) at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68) at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:78) at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:57) at javax.faces.component.UICommand.broadcast(UICommand.java:127) at org.ajax4jsf.component.AjaxActionComponent.broadcast(AjaxActionComponent.java:55) at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:329) at org.ajax4jsf.component.AjaxViewRoot.broadcastEventsForPhase(AjaxViewRoot.java:304) at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:261) at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:474) at org.apache.my**faces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32) at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:103) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:183) at org.apache.myfaces.webapp.MyFacesServlet.service(MyFacesServlet.java:103) at com.endersys.itap.ui.MyFacesServletWrapper.service(MyFacesServletWrapper.java:34) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:341) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206) at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.endersys.itap.ui.MenuFilter.doFilter(MenuFilter.java:169) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:636)

引起：java.sql.BatchUpdateException：批处理条目0从ExternalSource删除，其中EXID = 6已中止。调用getNextException以查看原因。 at org.postgresql.jdbc2.AbstractJdbc2Statement $ BatchResultHandler.handleError（AbstractJdbc2Statement.java:2537） at org.postgresql.core.v3.QueryExecutorImpl.processResults（QueryExecutorImpl.java:1328） at org.postgresql.core.v3.QueryExecutorImpl.execute（QueryExecutorImpl.java:351） at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch（AbstractJdbc2Statement.java:2674）在org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.java:48）在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:242） ......还有55个 javax.persistence.RollbackException：提交事务时出错在org.hibernate.ejb.TransactionImpl.commit（TransactionImpl.java:71）在com.endersys.itap.ui.module.storage.StorageManager.deleteExternalDataStorage（StorageManager.java:351）在com.endersys.itap.ui.module.storage.ExternalDataStorageEditorBean.delete（ExternalDataStorageEditorBean.java:73） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:616）在org.apache.el.parser.AstValue.invoke（AstValue.java:172） at org.apache.el.MethodExpressionImpl.invoke（MethodExpressionImpl.java:276）在com.sun.facelets.el.TagMethodExpression.invoke（TagMethodExpression.java:68）在javax.faces.component._MethodExpressionToMethodBinding.invoke（_MethodExpressionToMethodBinding.java:78） at org.apache.myfaces.application.ActionListenerImpl.processAction（ActionListenerImpl.java:57）在javax.faces.component.UICommand.broadcast（UICommand.java:127）在org.ajax4jsf.component.AjaxActionComponent.broadcast（AjaxActionComponent.java:55）在org.ajax4jsf.component.AjaxViewRoot.processEvents（AjaxViewRoot.java:329）在org.ajax4jsf.component.AjaxViewRoot.broadcastEventsForPhase（AjaxViewRoot.java:304）在org.ajax4jsf.component.AjaxViewRoot.processPhase（AjaxViewRoot.java:261）在org.ajax4jsf.component.AjaxViewRoot.processApplication（AjaxViewRoot.java:474）在org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute（InvokeApplicationExecutor.java:32）在org.apache.myfaces.lifecycle.LifecycleImpl.executePhase（LifecycleImpl.java:103）在org.apache.myfaces.lifecycle.LifecycleImpl.execute（LifecycleImpl.java:76）在javax.faces.webapp.FacesServlet.service（FacesServlet.java:183）在org.apache.myfaces.webapp.MyFacesServlet.service（MyFacesServlet.java:103）在com.endersys.itap.ui.MyFacesServletWrapper.service（MyFacesServletWrapper.java:34）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:290）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter（ExtensionsFilter.java:341）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:235）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter（BaseXMLFilter.java:206）在org.ajax4jsf.webapp.BaseFilter.handleRequest（BaseFilter.java:290）在org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest（BaseFilter.java:388）在org.ajax4jsf.webapp.BaseFilter.doFilter（BaseFilter.java:515）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:235）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在com.endersys.itap.ui.MenuFilter.doFilter（MenuFilter.java:169）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:235）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:233） at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:191）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:127） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:298）在org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:852）在org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:588）在org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:489）在java.lang.Thread.run（Thread.java:636）引起：org.hibernate.exception.ConstraintViolationException：无法执行JDBC批量更新在org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java:71）在org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:43）在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:249）在org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:235）在org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:144）在org.hibernate.event.def.AbstractFlushingEventListener.performExecutions（AbstractFlushingEventListener.java:298）在org.hibernate.event.def.DefaultFlushEventListener.onFlush（DefaultFlushEventListener.java:27）在org.hibernate.impl.SessionImpl.flush（SessionImpl.java:1000）在org.hibernate.impl.SessionImpl.managedFlush（SessionImpl.java:338）在org.hibernate.transaction.JDBCTransaction.commit（JDBCTransaction.java:106）在org.hibernate.ejb.TransactionImpl.commit（TransactionImpl.java:54） ......还有47个引起：java.sql.BatchUpdateException：批处理条目0从ExternalSource删除，其中EXID = 6被中止。调用getNextException以查看原因。 at org.postgresql.jdbc2.AbstractJdbc2Statement $ BatchResultHandler.handleError（AbstractJdbc2Statement.java:2537） at org.postgresql.core.v3.QueryExecutorImpl.processResults（QueryExecutorImpl.java:1328） at org.postgresql.core.v3.QueryExecutorImpl.execute（QueryExecutorImpl.java:351） at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch（AbstractJdbc2Statement.java:2674）在org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.java:48）在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:242） ......还有55个

And this is constraint on table ALTER TABLE externaltask_externalsource ADD CONSTRAINT fk755287f526733b01 FOREIGN KEY (exid) REFERENCES externalsource (exid) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION;

Answer 1

发现它有点难以理解这个问题。我假设您正在寻找在删除externaltask实体时要删除的externalsources。我认为你需要在级联设置中包含REMOVE或者基本上是cascade = {CascadeType.ALL}

编辑：想想我找到了你的情况的答案。当多对多线路连接时，PP会在db上创建一个完整性约束（我认为你正在从实体中做一个模式的自动生成）。

在这种情况下，源和任务之间的关系所在的SOURCE_TASK表与SOURCE表具有外键关系。因此，当您尝试从SOURCE表中删除某些内容时，底层数据库会提供一个sql异常。我能够重现你的问题。

解决方案：我做的是删除了外键约束，我能够删除源实体。

正如我最初所说的TASK去除SOURCE 如果您使用Cascade.ALL删除TASK实体，它应该删除所有条目。

更新：我认为你处理SOURCE对象之间的平等有一些方法。如果找到至少一个“相等”的对象，则List.contains（o）将为true。 List.remove（o）将删除第一次出现'等于'o的对象。所以我敢打赌，列表中会出现多次“相等”的对象。

Answer 2

我添加了连接提取并解决了问题。

public boolean deleteExternalDataStorage(Long sid) {
        EntityManager em = getEntityManager();
        EntityTransaction et = em.getTransaction();

        try {
            et.begin();
            ExternalDataStorage s = em.find(ExternalDataStorage.class, sid);            
            List<ExternalTask> tasks=(List<ExternalTask>) em.createQuery("SELECT t FROM ExternalTask t join fetch t.externalSources").getResultList();
           for(ExternalTask t:tasks) {
              if(t.getExternalSources().contains(s)){
                      t.getExternalSources().remove(s);
                  if(t.getExternalSources().isEmpty()){
                      em.remove(t);
                  }
               }
           }       
            em.remove(s);
            et.commit();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
             if (et.isActive()) {
                et.rollback();
            }

        } finally {

        }
        return false;
    }

JPA @manytomany单向映射

2 个答案: