代码首先迁移

Question

我有一个类，我想补充一些列如下：

public partial class News : DbMigration 
{ 
    public override void Up() 
    { 

     AddColumn("dbo.News", "IsSchool", c => c.Boolean()); 
     AddColumn("dbo.News", "City", c => c.String(maxLength: 200)); 
     AddColumn("dbo.News", "County", c => c.String(maxLength: 200)); 
     AddColumn("dbo.News", "SchoolName", c => c.String(maxLength: 200)); 
     AddColumn("dbo.News", "VisitDatetime", c => c.DateTime()); 

     Sql("UPDATE dbo.News SET IsSchool='false'"); 
    } 

    public override void Down() 
    { 
     DropColumn("dbo.News", "VisitDatetime"); 
     DropColumn("dbo.News", "County"); 
     DropColumn("dbo.News", "City"); 
     DropColumn("dbo.News", "IsSchool"); 
     DropColumn("dbo.News", "SchoolName"); 
    } 
} 

下面是配置：

public sealed class Configuration : DbMigrationsConfiguration<DataContext> 
{ 
    public Configuration() 
    { 
     AutomaticMigrationsEnabled = true; 
     AutomaticMigrationDataLossAllowed = true; 
    } 

    protected override void Seed(DataContext context) 
    { 
     // This method will be called after migrating to the latest version. 

     // You can use the DbSet<T>.AddOrUpdate() helper extension method 
     // to avoid creating duplicate seed data. E.g. 
     // 
     // context.People.AddOrUpdate(
     //  p => p.FullName, 
     //  new Person { FullName = "Andrew Peters" }, 
     //  new Person { FullName = "Brice Lambson" }, 
     //  new Person { FullName = "Rowan Miller" } 
     // ); 
     // 
    } 
} 

我只是想运行此一次，看看是否数据库将得到更新？我怎样才能确保这个迁移运行？

我不得不数据库中没有接入和我的应用程序一直抱怨，IsSchool字段为Nullable

Answer 1

尝试修改其中，增加“IsSchool”行

AddColumn("dbo.News", "IsSchool", c => c.Boolean(nullable: false, defaultValue: false));