Question

我遇到了Code first和生成的sql数据库的问题。

关于公牛和奶牛的申请

以下是我的课程：

public class Animal : BaseEntity
{
    public virtual int? DeathId { get; set; }
    public virtual Death Death { get; set; }

    public virtual int? SellId { get; set; }
    public virtual Sell Sell { get; set; }
}

public class Death : Event
{
    public virtual int AnimalId { get; set; }
    public virtual Animal Animal { get; set; }
}

public class Sell : Event
{
    public virtual int AnimalId { get; set; }
    public virtual Animal Animal { get; set; }
}

生成这个sql脚本：

create table [dbo].[Animal] (
    [Id] [int] not null identity,
    [DeathId] [int] null,
    [SellId] [int] null,
    primary key ([Id])
);
create table [dbo].[Death] (
    [Id] [int] not null,
    [AnimalId] [int] not null,
    primary key ([Id])
);
create table [dbo].[Sell] (
    [Id] [int] not null,
    [AnimalId] [int] not null,
    primary key ([Id])
);

一切正常，但问题在于这些类：

public class Servicie : Event
{
    public virtual int MaleId { get; set; }
    public virtual Male Male { get; set; }

    public virtual int FemaleId { get; set; }
    public virtual Female Female { get; set; }

    public virtual int? ChildbirthId { get; set; }
    public virtual Childbirth Childbirth { get; set; }
}

public class Childbirth : Event
{
    public virtual int ServicieId { get; set; }
    public virtual Servicie Servicie { get; set; }

    public virtual int FemaleId { get; set; }
    public virtual Female Female { get; set; }
}

这些类生成此Sql脚本：

create table [dbo].[Service] (
    [Id] [int] not null,
    [MaleId] [int] not null,
    [FemaleId] [int] not null,
    [ChildbirthId] [int] null,
    primary key ([Id])
);
create table [dbo].[Parto] (
    [Id] [int] not null,
    [Servicie_Id] [int] not null,
    [ServicieId] [int] not null,
    [FemaleId] [int] not null,
    primary key ([Id])
);

正如你所看到的，还有“ServicieId”和“Servicie_Id”，最后一个，自动添加。

所有都是1到0..1的关系，我没有看到任何差异，有人可以帮助我吗？

Answer 1

编辑 - 添加了整个测试应用程序：

当我使用这个模型时（你的简化版本）。我不得不添加一个必需的注释，因此EF知道哪个是主体，哪个是从属端，它感到困惑。

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Text;

namespace CFExamples2
{
    public class Servicio 
    {
        public int Id { get; set; }

        public int? PartoId { get; set; }
        public virtual Parto Parto { get; set; }
    }

    public class Parto
    {
        public int Id { get; set; }
        public virtual int ServicioId { get; set; }
        [Required]
        public virtual Servicio Servicio { get; set; }
    }


    public class Model : DbContext
    {
        public DbSet<Servicio> Servicios { get; set; }
        public DbSet<Parto> Partos { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {

        }
    }
    class Program
    {
        static void Main(string[] args)
        {


        }
    }
}

它产生了这个：

enter image description here

EF添加已定义的FK

1 个答案: