CRUD操作我是比較新的的EntityFramework,ASP.NET MVC和5用的EntityFramework和MVC 5
被跟隨從這裏http://www.asp.net/mvc/tutorials/mvc-5/introduction/getting-started
教程,我想通過增加單把它擴大Movie-Actor的多對多關係(這是一個演員可以在許多電影中)。
因此,我在我的模型文件夾中有這些代碼:
Actor.cs
namespace MvcMovie.Models
{
public class Actor
{
public int ActorId { get; set; }
public String FirstName { get; set; }
public String Address { get; set; }
public ICollection<Movie> Movies { get; set; }
}
}
Movie.cs
namespace MvcMovie.Models
{
public class Movie
{
public int ID { get; set; }
[StringLength(60, MinimumLength = 3)]
public string Title { get; set; }
[Display(Name = "Release Date")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:dd-MM-yyyy}", ApplyFormatInEditMode = true)]
public DateTime ReleaseDate { get; set; }
[RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$")]
[Required]
[StringLength(30)]
public string Genre { get; set; }
[Range(1, 100)]
[DataType(DataType.Currency)]
public decimal Price { get; set; }
[RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$")]
[StringLength(5)]
public string Rating { get; set; }
public int ActorId { get; set;}
public Actor Actor { get; set; }
}
}
MovieDBContext.cs
namespace MvcMovie.Models
{
public class MovieDBContext : DbContext
{
public DbSet<Actor> Actors { get; set; }
public DbSet<Movie> Movies { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Actor>().HasKey(p => p.ActorId);
modelBuilder.Entity<Actor>().Property(c => c.ActorId)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
modelBuilder.Entity<Movie>().HasKey(m => m.ID);
modelBuilder.Entity<Movie>().Property(m => m.ID)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
modelBuilder.Entity<Movie>().HasRequired(p => p.Actor)
.WithMany(m => m.Movies)
.HasForeignKey(m => m.ActorId);
base.OnModelCreating(modelBuilder);
}
}
}
然後我就包管理器嘗試以下命令
PM> Add-Migration ActorTable
PM> Update-Database
並得到以下錯誤: ALTER TABLE語句衝突與外鍵約束「FK_dbo.Movies_dbo.Actors_ActorId」。衝突發生在數據庫「MOVIES_bd6a468e283a4100b6021adaf9911f7d」,表「dbo.Actors」,列'ActorId'中。
我有一種感覺,它已經得到的東西與我的數據種子做的(內部configuration.cs文件)
protected override void Seed(MvcMovie.Models.MovieDBContext context)
{
context.Movies.AddOrUpdate(i => i.Title,
new Movie
{
Title = "When Harry Met Sally",
ReleaseDate = DateTime.Parse("1989-1-11"),
Genre = "Romantic Comedy",
Rating = "PG",
Price = 7.99M
},
}
有人建議我到正確的方向。謝謝
ps:我有MovieController及其相應的視圖設置(從我做的教程中顯示的前面的步驟)。
除了麥的回答是:
本文包含有用的幫助爲好,特別是在添加遷移和更新數據庫部分。
嘗試刪除數據庫並重新生成它。我懷疑在修改之前已經插入了數據 –