EF6级联,使用组合键,多个表引用一对一删除

问题描述

我有一个地址表,希望将其用作其他多个表中的FK引用:

  • 客户
  • 公司
  • 等等

这里明显的问题是,正确的一对一表会将主体的PK(例如,客户的PK等)用作地址键,而使用多个表将导致地址键重复,因此我想使用组合键作为参考。

这是基本的一对一,只有实体类型:

客户类别

public class Customers
{
    [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity),Column(Order = 1),ForeignKey("Address")]
    public int Id { get; set; }

    public string CustomerName { get; set; }

    public virtual Addresses Address { get; set; }
}

地址类别

public class Addresses : AuditBase
{
   [Key,Column(Order = 1)]
    public int Id { get; set; }
    
    [required]
    [StringLength(500)]
    public string Address1 { get; set; }

    [StringLength(500)]
    public string Address2 { get; set; }

    [required,MaxLength(100)]
    [StringLength(150)]
    public string City { get; set; }

    [required,MaxLength(10)]
    [StringLength(2)]
    public string State { get; set; }

    [required]
    [StringLength(5)]
    public string Zip { get; set; }

    #endregion Properties
}

用于Cascade Delete的Fluent API实现

    public static void buildModel(ref DbModelBuilder modelBuilder)
    {
        modelBuilder.Initializeusermodel();

        modelBuilder.Entity<Customers>()
            .HasOptional(x => x.Address)
            .Withrequired()
            .WillCascadeOnDelete(true);
    }

如您所见,迁移会正确呈现地址表。

        CreateTable(
            "dbo.Addresses",c => new
                {
                    Id = c.Int(nullable: false),Address1 = c.String(nullable: false,maxLength: 500),Address2 = c.String(maxLength: 500),City = c.String(nullable: false,maxLength: 100),State = c.String(nullable: false,maxLength: 10),Zip = c.String(nullable: false,maxLength: 5),CreatedDate = c.DateTime(nullable: false),ModifiedDate = c.DateTime(nullable: false),OrganizationsId = c.Int(),NotesId = c.Int(),CreatedByUserId = c.Int(),ModifiedByUserId = c.Int(),})
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Organizations",t => t.OrganizationsId)
            .ForeignKey("dbo.Notes",t => t.NotesId)
            .ForeignKey("dbo.Customers",t => t.Id,cascadeDelete: true)
            .ForeignKey("dbo.Users",t => t.CreatedByUserId)
            .ForeignKey("dbo.Users",t => t.ModifiedByUserId)
            .Index(t => t.Id)
            .Index(t => t.OrganizationsId,name: "IX_Organizations_Id")
            .Index(t => t.NotesId,name: "IX_Notes_Id")
            .Index(t => t.CreatedByUserId,name: "IX_CreatedByUser_Id")
            .Index(t => t.ModifiedByUserId,name: "IX_ModifiedByUser_Id");

但是,如果我添加第二个键,则不会。

这是使用复合键更改的新地址

public class Addresses : AuditBase
{
    [Key,Column(Order = 1)]
    public int Id { get; set; }

    [Key,Column(Order = 2)]
    public int EntityTypeId { get; set; }

使用外键参考和订单更新了客户类别

public class Customers
{
    [Key,ForeignKey("Address")]
    public int Id { get; set; }

    [ForeignKey("Address"),Column(Order = 2)]
    public int EntityTypeId { get; set; }

但是正如您所看到的,迁移现在包括对主体的显式引用,而不是复合键绑定[请参阅=>(CustomersId = c.Int(nullable:false)]

CreateTable(
            "dbo.Addresses",EntityTypeId = c.Int(nullable: false),CustomersId = c.Int(nullable: false),})
            .PrimaryKey(t => new { t.Id,t.EntityTypeId })
            .ForeignKey("dbo.Organizations",t => t.Id)
            .ForeignKey("dbo.Notes",t => t.Id)
            .ForeignKey("dbo.Customers",t => t.CustomersId,t => t.ModifiedByUserId)
            .Index(t => t.Id)
            .Index(t => t.CustomersId,name: "IX_Customers_Id")
            .Index(t => t.CreatedByUserId,name: "IX_ModifiedByUser_Id");

我尝试使用流畅的API进行变体,但是我一定做得不对。这有可能吗?

解决方法

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