通过流畅API第一实施零个或一个为零,或在EF code一一对应关系 [英] Implementing Zero Or One to Zero Or One relationship in EF Code first by Fluent API
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问题描述
我有两个POCO类
public class Order
{
int id;
string code;
int? quotationId; //it is foreign key
public int Id{get;set;}
public string Code{get;set;}
public int? QuotationId{get;set;}
Quotation quotation;
public virtual Quotation Quotation { get; set; }
....
}
public class Quotation
{
int Id;
string Code;
public int Id{get;set;}
public string Code{get;set;}
Order order;
public virtual Order Order { get; set; }
....
}
每个订单可以从一个或零报价制成,每个报价的可以作出的命令,所以我有一个一零到一零的关系,我怎么能实现这个在EF code首先通过流畅API?
each Order may made from one or zero quotation, and each quotation may cause an order, so i have an "one or zero" to "one or zero" relation, how can i implement this, in EF Code first by fluent api?
推荐答案
通过改变波苏斯为:
public class Order
{
public int OrderId { get; set; }
public virtual Quotation Quotation { get; set; }
}
public class Quotation
{
public int QuotationId { get; set; }
public virtual Order Order { get; set; }
}
和使用这些映射文件:
public class OrderMap : EntityTypeConfiguration<Order>
{
public OrderMap()
{
this.HasOptional(x => x.Quotation)
.WithOptionalPrincipal()
.Map(x => x.MapKey("OrderId"));
}
}
public class QuotationMap : EntityTypeConfiguration<Quotation>
{
public QuotationMap()
{
this.HasOptional(x => x.Order)
.WithOptionalPrincipal()
.Map(x => x.MapKey("QuotationId"));
}
}
我们都会有这个DB(这意味着0..1-0..1):
we will have this DB(that means 0..1-0..1):
特别感谢(瓦希德先生纳西)
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