EF4 Code First数据库生成

时间:2012-04-18 18:00:16

标签: c# asp.net-mvc database-design entity-framework-4

我是Entity Framework的初学者,我被困在无法使代码生成数据库的地方。

我的上下文就像:

 public class ChatContext : DbContext
    {
        public ChatContext()
            : base("ChatContext")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<ChatRoom>()
                         .Map(c => c.ToTable("chat_rooms"));

            modelBuilder.Entity<ChatUser>()
                        .HasMany(u => u.Rooms)
                        .WithMany(r => r.Users)
                        .Map(c => c.ToTable("chat_users"));

            modelBuilder.Entity<ChatUser>()
                       .HasMany(u => u.ConnectedUsers);

            base.OnModelCreating(modelBuilder);
        }

        public DbSet<ChatUser> Users { get; set; }
        public DbSet<ChatRoom> Rooms { get; set; }
        public DbSet<ChatMessage> Messages { get; set; }    
    }

我的Global.asax:

public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }

        protected void Application_Start()
        {
            Database.SetInitializer<ChatContext>(new DropCreateDatabaseIfModelChanges<ChatContext>());

            RegisterRoutes(RouteTable.Routes);
        }
    }

我在Web.config中的连接字符串:

<connectionStrings>
    <add name="ChatContext" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=ChatContext;Integrated Security=True" providerName="System.Data.SqlClient" />
  </connectionStrings>

有人能找出问题所在吗?构建项目时,不会返回任何错误。 Global.axax中的断点显示它击中了Application_Start()。

1 个答案:

答案 0 :(得分:2)

您需要执行查询。这将检查数据库是否存在,如果不存在则会创建。