關於數據庫數據更改的ZK UI更新

Question

當數據庫發生某些更改時，如何更新UI上的數據？ 我想讓我的用戶界面自動更新數據，當我更改我的數據庫（使用通用數據庫查看器）記錄時，就像Facebook有人在剪貼板上發佈內容時一樣（無需刷新）

Answer 1

您可以使用輪詢或推送。

推可以擴展SelectorComposer 並適用於你ZUL

public class ComposerPush extends SelectorComposer<Component> { 

    private static final long serialVersionUID = 1L; 
// wire components 
@Wire 
ZHighCharts chartComp; 

// Basic Line 
private SimpleExtXYModel dataChartModel = new SimpleExtXYModel(); 


public void startWorker() { 
      final Desktop desktop = Executions.getCurrent().getDesktop(); 
      if (desktop.isServerPushEnabled()) { 
      } else { 
       desktop.enableServerPush(true); 
       if(timer != null)timer.cancel(); 
       timer = new Timer(); 
       timer.schedule(databaseCheck(), 0, 5000); 
      } 
     } 

    private TimerTask databaseCheck() { 
      return new TimerTask() { 
       @Override 
       public void run() { 
        updateInfo(); 
       } 
      }; 
     } 

     private void updateInfo() { 
      try { 
       Desktop desktop = chartComp.getDesktop(); 
       if(desktop == null) { 
        timer.cancel(); 
        return; 
       } 

       Executions.activate(desktop); 
       try { 

          **<your code in here>** 

       } finally { 
        Executions.deactivate(desktop); 
       } 
      } catch (DesktopUnavailableException ex) { 
       System.out.println("Desktop currently unavailable"); 
       timer.cancel(); 
      } catch (InterruptedException e) { 
       System.out.println("The server push thread interrupted"); 
       timer.cancel(); 
      } 


     }