Question

在更新期间，具有Editor框架的实体从db调用中选择两次。这可能不是问题，而是编辑框架的一个特点吗？

以下是代码段：

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();

                }
            }));

   ...

点击保存按钮后的休眠输出：

 [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=?

这是正常的吗？

Answer 1

在GWT Google小组上回答：https://groups.google.com/d/msg/google-web-toolkit/T4N1puddcS4/vV1wYZ6n9EUJ

在此复制以供参考和使用：

首先，这与编辑框架无关，但与RequestFactory无关。

如果您没有使用Locator，或者您没有覆盖isLive()的{{1}}方法，则这是预期的行为：这就是RequestFactory确定是否在将响应发送给客户端之前，实体仍处于“活动状态”。如果不是，那么它将告诉客户端该实体已被删除（使用Locator在EventBus上发送EntityProxyChange事件。 WriteOperation.DELETED的默认实现是isLive(entity)，这也是在没有find(entity.get()) != null实体的情况下发生的情况（区别在于您可以覆盖Locator isLive（）更改默认实现，例如，更优化的实现。）

GWT编辑器：在更新之前选择两次调用

1 个答案: