http://www.entityframeworktutorial.net/code-first/code-based-migration-in-code-first.aspx = Code based Migration

http://www.entityframeworktutorial.net/code-first/automated-migration-in-code-first.aspx = Automated Migration

 

上边两篇文章分别介绍了DataMigration的两种方法。 下面简单总结一下步骤供自己使用。

VS Tools->package manager console

> enble-migration 

执行上面步骤将在你的DBContext目录下生成一个Migrations/Configuration.cs文件。这个文件的。 Seed方法是当Migration完成以后执行的插入数据库的操作，可以放一些系统运行所需要的必须得数据

1 internal sealed class Configuration : DbMigrationsConfiguration
     
       2     { 3         public Configuration() 4         { 5             AutomaticMigrationsEnabled = true; 6             ContextKey = "Infrastructor.MainBoundedContext.UnitWorks.MainDBUnitWorkContext"; 7         } 8  9         protected override void Seed(Infrastructor.MainBoundedContext.UnitWorks.MainDBUnitWorkContext context)10         {11             //  This method will be called after migrating to the latest version.12 13             //  You can use the DbSet
      
       .AddOrUpdate() helper extension method 14             //  to avoid creating duplicate seed data. E.g.15             //16             //    context.People.AddOrUpdate(17             //      p => p.FullName,18             //      new Person { FullName = "Andrew Peters" },19             //      new Person { FullName = "Brice Lambson" },20             //      new Person { FullName = "Rowan Miller" }21             //    );22             //23             context.Status.AddOrUpdate(p => p.Name,24                 new Status { Name = "通过" },25                 new Status { Name = "等待审批" }26                 );27         }28     }
      
     

将以上构造函数Merge到自己的DBCOntext文件中

public MainDBUnitWorkContext(string connectionString): base(connectionString){//this.Configuration.ProxyCreationEnabled = false;this.Configuration.LazyLoadingEnabled = true;Database.SetInitializer(new MigrateDatabaseToLatestVersion
     
      ("MyDBConnectionString"));}
     

 

> Add-Migration "MyTest"

添加新的migration,执行完成以后在migration目录下生成一个 20150101_Mytest.cs文件，其内部列举了这次DB Upgrade执行的升级和降级的操作

> Update-DataBase -script: 参数script 是执生成sql脚本，也可以不要这个参数，将直接更新数据库