停止实体框架修改数据库 [英] Stop Entity Framework from modifying database

问题描述

我开始玩实体框架的代码优先方法，主要是为了使我可以用我的视图中的注释来装饰我的属性（否则，现在我必须创建一个几乎是与实体框架为我生成的一样，所以我可以添加注释，然后将数据从一个对象复制到下一个对象）。

现在看起来像当我启动我的应用程序时，它正在尝试创建一个数据库。

我不希望实体框架永远修改我的数据库。不，没有。甚至没有尝试。修改数据库真的不是那么难;如果我自己做的话，我会感觉更舒服我不需要框架设计数据库时握住我的手。

我可以告诉框架停止尝试修改我的数据库吗？我非常犹豫使用代码优先，因为它试图修改我的数据库是相当可怕的事实。即使在发展中，我也不想看到它发生。

我没有运气吗？

解决方案

如果您不希望EF创建数据库，可以禁用数据库初始化程序：

  public class SchoolDBContext：DbContext 
 {
 public Sc​​hoolDBContext（）：base（SchoolDBConnectionString）
 {
 //禁用初始化器
 Database.SetInitializer&SchoolDBContext> ）; 
} 
 public DbSet< Student>学生{get;组; } 
 public DbSet< Standard>标准{get;组; } 
} 
  

请参阅 http://www.entityframeworktutorial.net/code-first/turn-off-database-initialization-in -code-first.aspx

I'm starting to play around with the code-first approach to the entity framework, primarily so that I can decorate my properties with annotations for display in my view (otherwise, right now I have to create a class that is nearly identical to the one that entity framework generated for me just so I can add annotations, and then copy the data from one object to the next).

Right now it looks like when I start my application it is trying to create a database.

I do not want entity framework to ever modify my database. No. Not ever. Don't even try it. It really isn't that hard to modify databases; I would feel much more comfortable if I did that myself. I don't need a framework to hold my hand when designing a database.

Can I tell the framework to stop trying to modify my database? I'm very hesitant to use code-first now as the fact that it's trying to modify my database is rather frightening. Even in development I never want to see it happen.

Am I out of luck?

解决方案

If you don't want EF to create your database, you can disable the database initializer:

public class SchoolDBContext: DbContext 
{
    public SchoolDBContext() : base("SchoolDBConnectionString")
    {            
        //Disable initializer
        Database.SetInitializer<SchoolDBContext>(null);
    }
    public DbSet<Student> Students { get; set; }
    public DbSet<Standard> Standards { get; set; }
}

See http://www.entityframeworktutorial.net/code-first/turn-off-database-initialization-in-code-first.aspx

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