Spring-Hibernate：使用相关对象时如何定义默认值

发布于 2024-10-11 10:48:46 字数 514 浏览 2 评论 0原文

我有一个 Spring 3 MVC 应用程序将 Hibernate 作为 ORM。一切正常。但有一个问题：

我有一个网络界面来创建新对象，比如新客户。每个客户都有一个状态。状态表具有预定义值。 CUSTOMER-Table 有一个 status_id 字段来连接信息。

显示 CUSTOMERS 列表时，我可以访问 CUSTOMER.STATUS 属性并根据 id 获取正确的对象。

但是：如何为新客户定义标准状态？我有一个带有下拉菜单的网络界面。

<form:select path="status">
<form:option value="0" label="- Please Select -" />
<form:options items="${customerStatuses}" itemValue="id" />
</form:select>

这总是显示“请选择”文本，因为该值似乎始终为 0？？？如何将其更改为我单独选择的标准状态？

原文

I have a Spring 3 MVC app sing Hibernate as ORM. All works fine. But a question:

I have a web interface to create new objects, say a new CUSTOMER. Each CUSTOMER has a STATUS. The STATUS-Table has predefined values. The CUSTOMER-Table has a status_id field to joind the information.

When displaying a list of CUSTOMERS, I can access the CUSTOMER.STATUS property and get the right object baed on the id.

BUT: How can I define a standard status for NEW CUSTOMERS? I have a web interface with a dropdown.

<form:select path="status">
<form:option value="0" label="- Please Select -" />
<form:options items="${customerStatuses}" itemValue="id" />
</form:select>

This always shows the "Please Select" text because it seems like the value is always 0??? How can I change this to my individually selected standard status?

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吝吻 2024-10-18 10:48:46

您的控制器需要处理这个问题。我会这样做：

@RequestMapping(value = { "/new-customer-form" })
public String showNewCustomerForm(ModelMap model) {
    Customer newCustomer = new Customer();
    newCustomer.setStatus(statusRepository.getDefaultStatus());
    model.addAttribute("customer", newCustomer);
    model.addAttribute("customerStatuses", statusRepository.getAllStatuses());
    return "customer-form";
}

事实上，“-请选择-”标签将不再显示，因为您的状态始终已满。

（我希望这次我正确理解了你的问题。）

You controller needs to take care of this. I would do it like this:

@RequestMapping(value = { "/new-customer-form" })
public String showNewCustomerForm(ModelMap model) {
    Customer newCustomer = new Customer();
    newCustomer.setStatus(statusRepository.getDefaultStatus());
    model.addAttribute("customer", newCustomer);
    model.addAttribute("customerStatuses", statusRepository.getAllStatuses());
    return "customer-form";
}

As a matter of fact, the "- Please Select -" label will not show anymore because your status is always filled.

(I hope I understood your question correctly this time.)

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