将属性映射到 NHibernate 中另一个表的字段
考虑以下类：
class Order {
int OrderId {get; set;}
int CustomerId {get; set;}
string CustomerName {get; set;}
//other fields go here
}
它映射到 Orders 表。是否可以通过外键关系将属性 CustomerName 映射到 Customers 表？
consider the following class:
class Order {
int OrderId {get; set;}
int CustomerId {get; set;}
string CustomerName {get; set;}
//other fields go here
}
which is mapped to Orders table. Is it possible to map the property CustomerName to the Customers table through the foreign key relation?
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是的，您可以使用 加入 映射为此的元素。另一种选择是映射视图而不是表。但如果可能的话，您应该采用面向对象的方法并映射订单和客户之间的多对多关系。
Yes, you can use the join mapping element for this. Another option is to map a view instead of a table. But if possible you should take the object-oriented approach and map the many-to-many relationship between Order and Customer.
我强烈建议您不要为此使用
相反，订单应该与客户有关系。然后，您可以根据需要投影名称，尽管使用
order.Customer.Name更容易。因此，归结为：
1) 将
Customer属性添加到Order2) 映射该属性（在示例中，CustomerId 是 FK 列的名称）
3)如果您特别想要拥有
CustomerName属性，请从 Customer 投影它：I strongly suggest you don't use
<join/>for this. Although it would accomplish what you requested, it creates other problems.Instead, Order should have a relationship with Customer. You can then project the name if you want, although it's easier to just use
order.Customer.Name.So, it boils down to this:
1) Add
Customerproperty toOrder2) Map the property (in the example, CustomerId is the name of the FK column)
3) If you specifically want to have a
CustomerNameproperty, project it from Customer: