[英]3 foreign keys to one table to one column
有2個實體:“ A”和“ B”。 本質上,“ A”包含以下字段:
- A_id (PK)
- B1_id (FK)
- B2_id (FK)
- B3_id (FK)
本質上,“ B”:B_id和其他字段。 是否可以一對一地建立與EF和MS的關系,其中“ B1_id”,“ B2_id”和“ B3_id”是表“ B”中一個屬性B_id的外部鍵。 如果可以的話,如何在類“ A”中命名導航屬性,我認為應該有三個?
您可以執行以下操作:
public class A
{
public int Id { get; set; }
public int B1Id { get; set; }
public int B2Id { get; set; }
public int B3Id { get; set; }
[ForeignKey("B1Id")]
public B B1 { get; set; }
[ForeignKey("B2Id")]
public B B2 { get; set; }
[ForeignKey("B3Id")]
public B B3 { get; set; }
}
public class B
{
public int Id { get; set; }
public string Name { get; set; }
}
public class A
{
public int Id { get; set; }
//another properties
public virtual B B1 { get; set; }
public int B1Id { get; set; }
public virtual B B2 { get; set; }
public int B2Id { get; set; }
public virtual B B3 { get; set; }
public int B3Id { get; set; }
}
public class B
{
public int Id { get; set; }
//another properties
[InverseProperty(B1)]
public virtual ICollection<A> A1 { get; set; }
[InverseProperty(B2)]
public virtual ICollection<A> A2 { get; set; }
[InverseProperty(B3)]
public virtual ICollection<A> A3 { get; set; }
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.