我们是否需要在 Order 模型类中同时拥有 Customer 属性和 CustomerId 属性？

发布于 2024-10-15 22:59:28 字数 635 浏览 2 评论 0原文

我对实体框架和基于数据的应用程序非常陌生。

让 Customer 数据模型类如下：

public class Customer
{
    public int CustomerId {get;set;}
    public string Name {get;set;}
    //others properties have been omitted for the sake of simplicity.
}

和 Order 数据模型：

public class Order
{
    public int OrderId {get;set;}
    public int CustomerId {get;set;}
    public Customer Customer {get;set;}
    // other properties have been omitted for the sake of simplicity.
}

我的问题是：“我们是否需要一起使用 Customer 的属性在 Order 模型类中具有 CustomerId 属性？”

原文

I am very new to Entity Framework and data-based application.

Let the Customer data model class be as follows:

public class Customer
{
    public int CustomerId {get;set;}
    public string Name {get;set;}
    //others properties have been omitted for the sake of simplicity.
}

And the Order data model:

public class Order
{
    public int OrderId {get;set;}
    public int CustomerId {get;set;}
    public Customer Customer {get;set;}
    // other properties have been omitted for the sake of simplicity.
}

My question is: "Do we need a property of Customer together with a property of CustomerId in Order model class?"

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梦里南柯 2024-10-22 22:59:28

不，你不知道。 Order 类中的 Customer 对象足以识别客户 ID。此外，您可能需要 Customer 类中的订单集合，以便您轻松了解客户有多少个订单，如下所示：-

public class Customer {
  private Long customerId;
  private String name;
  private Set<Order> orders = new HashSet<Order>();

  // ... getters/setters 
}

public class Order {
  private Long orderId;
  private Customer customer;

  // ... getters/setters
}

因此，如果您想从订单中检索客户 ID ，你会做这样的事情：-

order.getCustomer().getCustomerId();

No, you don't. The Customer object in Order class is sufficient to identify the customer ID. Further, you might want a collection of orders in Customer class, so that you know how many orders the customer has easily, something like this:-

public class Customer {
  private Long customerId;
  private String name;
  private Set<Order> orders = new HashSet<Order>();

  // ... getters/setters 
}

public class Order {
  private Long orderId;
  private Customer customer;

  // ... getters/setters
}

So, if you want to retrieve the customer ID from an order, you will do something like this:-