Entity Framework 之Code First自动数据迁移

using MvcShopping.Migrations;
using MvcShopping.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace MvcShopping
{
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
//Global.asax.cs配置自动数据迁移
Database.SetInitializer(new MigrateDatabaseToLatestVersion<MvcShoppingContext, Configuration>());

AreaRegistration.RegisterAllAreas();

WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
}
}
}

namespace MvcShopping.Migrations
{
using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;

/// <summary>
/// ~/Migrations/Configuration.cs
/// </summary>
internal sealed class Configuration : DbMigrationsConfiguration<MvcShopping.Models.MvcShoppingContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = true; //开启 ①修改数据模型 ②项目重新生成 ③F5调试 ④查看数据库
AutomaticMigrationDataLossAllowed = true;
}

protected override void Seed(MvcShopping.Models.MvcShoppingContext 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" }
//    );
//
}
}
}