GWT編輯器：在更新前選擇兩次調用

在更新期間，具有編輯器框架的實體從db調用中選擇兩次。可能這不是問題，而是編輯器框架的一個特性？GWT編輯器：在更新前選擇兩次調用

下面的代碼片段：

public class UserActivity extends BasicActivity<UserActivity.Display> { 

... 

interface Driver extends RequestFactoryEditorDriver<UserProxy, UserPanel> { 
} 

private UserProxy user; 

private Driver driver; 

@Inject 
private Provider<UserRequestContext> userContextProvider; 

... 

@Inject 
public UserActivity(EventBus eventBus, Display display, PlaceController placeController, WmsRequestFactory requestFactory) { 

    super(display, eventBus, placeController); 

    driver = GWT.create(Driver.class); 
    driver.initialize(requestFactory, (UserPanel) display); 

} 

... 

@Override 
protected void onBind() { 

    UserRequestContext userRequestContext = userContextProvider.get(); 

    userRequestContext.updateUser(user); 

    driver.edit(user, userRequestContext); 

    registerHandler(display.getSaveButton().addClickHandler(
      new ClickHandler() { 
       public void onClick(ClickEvent event) { 

        RequestContext context = driver.flush(); 

        // Check for errors 
        if (driver.hasErrors()) { 
         display.getStatus().setHTML(
           "<b>Errors detected locally</b>"); 
         return; 
        } 

        // Send the request 
        context.fire(); 

       } 
      })); 

    ...

休眠輸出保存按鈕後點擊：

[INFO] Hibernate: select user0_.ID as ID1_0_, user0_.CREATED as CREATED1_0_, user0_.MODIFIED as MODIFIED1_0_, user0_.version as version1_0_, user0_.BIRTH_DATE 
as BIRTH5_1_0_, user0_.EMAIL as EMAIL1_0_, user0_.FIRST_NAME as FIRST7_1_0_, user0_.LAST_NAME as LAST8_1_0_, user0_.LOGIN as LOGIN1_0_, user0_.PASSWORD as PASS 
WORD1_0_ from USER user0_ where user0_.ID=? 

[INFO] Hibernate: select user0_.ID as ID1_0_, user0_.CREATED as CREATED1_0_, user0_.MODIFIED as MODIFIED1_0_, user0_.version as version1_0_, user0_.BIRTH_DATE 
as BIRTH5_1_0_, user0_.EMAIL as EMAIL1_0_, user0_.FIRST_NAME as FIRST7_1_0_, user0_.LAST_NAME as LAST8_1_0_, user0_.LOGIN as LOGIN1_0_, user0_.PASSWORD as PASS 
WORD1_0_ from USER user0_ where user0_.ID=? 

[INFO] Hibernate: update USER set MODIFIED=?, version=?, BIRTH_DATE=?, EMAIL=?, FIRST_NAME=?, LAST_NAME=?, LOGIN=?, PASSWORD=? where ID=? and version=?

它是正常的嗎？

來源

2011-12-10 John177

回答關於谷歌的GWT集團：https://groups.google.com/d/msg/google-web-toolkit/T4N1puddcS4/vV1wYZ6n9EUJ

複製在這裏以供參考和方便：

首先，這有什麼好做的編輯框架，但RequestFactory。

如果你不使用Locator，或者你不重寫你的Locator的isLive()方法，那麼這是預期的行爲：這是RequestFactory如何確定一個實體是否仍然「活着」發送響應之前，給客戶。如果不是，那麼它會告訴客戶該實體已被刪除（在EventBus上發送EntityProxyChange事件，並使用WriteOperation.DELETED）。 isLive(entity)的默認實現爲find(entity.get()) != null，這也是在實體不存在Locator時發生的情況（不同之處在於使用Locator可以重寫isLive（）以更改默認實現，例如更優化的實現）。

來源

2011-12-12 10:12:42

GWT編輯器：在更新前選擇兩次調用

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