如何更新從數據庫創建的treenode

這是我的HTML代碼;

<h:form id="form"> 
       <div id="treeKisim" style="float: left;margin-top: 30px;"> 


    <p:tree id="tree" dynamic="true" value="#{treeEventsView.root}" var="node" selectionMode="single" selection="#{treeEventsView.selectedNode}"> 


    <p:ajax event="select" update=":form:dersGrup " listener="#{treeEventsView.onNodeSelect}" /> 

         <p:treeNode> 
        <h:outputText value="#{node}" style="font-size: 13px;"/> 
         </p:treeNode> 
        </p:tree> 

       </div> 

    <div id="ortaKisim" style="float: left;margin-bottom: 30px;margin-top: -120px; margin-left: 15px;"> 

    <center><p:inputText id="dersGrup" style="margin-top: 150px;width: 150px; margin-bottom: 10px;" value="#{treeEventsView.ders}"/> 
        </center> 

<p:panelGrid columns="2"> 
    <p:outputLabel value="Sınıfı Seçiniz :" style="font-size: 12px;"/> 
    <p:selectOneMenu value="#{treeEventsView.sinif}" style="font-size: 12px;"> 
    <f:selectItems value="#{treeEventsView.siniflar}" /> 
         </p:selectOneMenu> 
    <p:outputLabel value="Günü Seçiniz :" style="font-size: 12px;"/> 
    <p:selectOneMenu value="#{treeEventsView.gun}" style="font-size: 12px;"> 
     <f:selectItems value="#{treeEventsView.gunler}" /> 
    </p:selectOneMenu> 

    <p:outputLabel value="Saati Seçiniz :" style="font-size: 12px;"/> 
    <p:selectOneMenu value="#{treeEventsView.saat}" style="font-size: 12px;"> 
    <f:selectItems value="#{treeEventsView.saatler}" /> 
         </p:selectOneMenu> 

    <p:outputLabel value="Derslik Seçiniz :" style="font-size: 12px;"/> 
    <p:selectOneMenu value="#{treeEventsView.okulSinif}" style="font-size: 12px;"> 
     <f:selectItems value="#{treeEventsView.okulSiniflar}" /> 
         </p:selectOneMenu> 

        </p:panelGrid> 
        <center> 
    <p:commandButton value="delete" actionListener="#{treeEventsView.dersiEkle}" > 

          <p:ajax update=":form:tree" /> 


         </p:commandButton> 

        </center> 
       </div> 
       </h:form>

This managedbean class = treeEventsView;

@ManagedBean(name = "treeEventsView") 
@ApplicationScoped 
private TreeNode root; 

private TreeNode selectedNode; 


@PostConstruct 
public void init() { 

root = new DefaultTreeNode("Root", null); 

EntityManagerFactory emf = Persistence.createEntityManagerFactory("DersProgramiWebPU"); 
EntityManager em = emf.createEntityManager(); 
Query sorgu = em.createQuery("SELECT d FROM Gruplar d"); 


    List<Gruplar> dersGrup=sorgu.getResultList(); 

    for (int i = 0; i < dersGrup.size(); i++) { 

    TreeNode ustNode = new DefaultTreeNode(dersGrup.get(i), root); 
    Query altSorgu = em.createQuery("SELECT d FROM TeoriUygulama d where d.dersId=:pDersId "); 
       altSorgu.setParameter("pDersId", dersGrup.get(i).getId()); 

    List<TeoriUygulama> islenisDers=altSorgu.getResultList(); 

    for (TeoriUygulama grup : islenisDers) { 
      TreeNode altNode = new DefaultTreeNode(grup, ustNode); 
        } 
       } 

      em.close(); 
      emf.close(); 


     } 

     String ders; 

     public String getDers() { 
      return ders; 
     } 

     public void setDers(String ders) { 
      this.ders = ders; 
     } 

     public TreeNode getRoot() { 
      return root; 
     } 

     public TreeNode getSelectedNode() { 

      return selectedNode; 
     } 

     public void setSelectedNode(TreeNode selectedNode) { 
      this.selectedNode = selectedNode; 
     }

，你可以看到在刪除（），我從數據庫和最後一行刪除我稱之爲（），這再次證明集根所以，當我點擊按鈕，我想更新樹節點，但它不工作，它不更新。你有什麼建議

來源

2016-08-17 buguz

在我看來，我認爲你的樹的建設是不正確的是你打開樹形結構的新視野？！？ –

我更新了我的代碼 – buguz

你的bean是@ApplicationScoped所以你@PostConstruct是調用僅在第一次爲整個應用程序生命週期，嘗試用@RequestScoped

來源

2016-08-18 19:40:25 Shadowritter

如何更新從數據庫創建的treenode

回答

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