Question

我正在使用mvc5和Entity Framework代码优先迁移我试图播种表，但我收到此错误消息：

The INSERT statement conflicted with the FOREIGN KEY constraint 
"FK_dbo.Orders_dbo.Users_UserId". The conflict occurred in database 
"DbDemo.Models.DbbContext", table "dbo.Users", column 'Id'.
The statement has been terminated.

我知道它的说法是，在播种订单之前，数据必须已经在users表中存在，但是用户中的userid是主键，因此我认为由于其identity = true，它会自动播种！那为什么会出现这个错误？

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
    public string PhoneNum { get; set; }
    public string Location { get; set; }
    public string Type { get; set; }
}

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

    //ForeignKey from Items table for the composite key
    [Key]
    [Column(Order = 2)]
    public int? ItemId { get; set; }
    public Item Item { get; set; }

    //ForeignKey from Users table
    public int? UserId { get; set; }
    public User User { get; set; }

    public int Quantity { get; set; }
    public int? TotalPrice { get; set; } //why did i put this field??!
}

这是用户种子迁移：

public partial class UsersSeed : DbMigration
{
    public override void Up()
    {
        Sql("insert into Users (Name,Email,Password,PhoneNum,Location,Type) values ('Khaled Tahboub', 'khaledk.tahboub@gmail.com', 'abc@123', '0797504280', 'Amman', 'A')");
        Sql("insert into Users (Name,Email,Password,PhoneNum,Location,Type) values ('Muath Mustafa', 'muathmustafa@gmail.com', 'abc@123', '0797504280', 'Amman', 'A')");
        Sql("insert into Users (Name,Email,Password,PhoneNum,Location,Type) values ('John Doe', 'JohnDoe@gmail.com', 'abc@123', '0797504280', 'Amman', 'B')");
    }

    public override void Down()
    {
    }
}

这是订单种子迁移：

public partial class OrdersSeed : DbMigration
{
    public override void Up()
    {
        Sql("insert into Orders (UserId, ItemId, Quantity) values (1, 1, 1)");
    }

    public override void Down()
    {
    }
}

为什么实体框架给我一个关于不存在的现有数据的错误

0 个答案: