EF Code First Migrations数据库迁移

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;

usingSystem.Data.Entity;
usingSystem.Data.Entity.Infrastructure;

usingPortal.Entities;
usingPortal.Mapping;

namespacePortal
{
    public classPortalContext : DbContext
    {
        staticPortalContext()
        {
            Database.SetInitializer(new DropCreateDatabaseIfModelChanges<PortalContext>());
        }

        public DbSet<Province> Provinces { get; set; }
        public DbSet<Category> Categories { get; set; }

        protected override voidOnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(newProvinceMap());
            modelBuilder.Configurations.Add(newCategoryMap());
        }
    }
}

staticPortalContext()
{
    Database.SetInitializer<PortalContext>(null);
}

namespacePortal.Migrations
{
    usingSystem;
    usingSystem.Data.Entity;
    usingSystem.Data.Entity.Migrations;
    usingSystem.Linq;

    internal sealed class Configuration : DbMigrationsConfiguration<Portal.PortalContext>{
        publicConfiguration()
        {
            AutomaticMigrationsEnabled = true;
        }

        protected override voidSeed(Portal.PortalContext 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" }
            //);
            //
}
    }
}

publicConfiguration()
{
      AutomaticMigrationsEnabled = false;
}