EF CodeFirst,同项目多个数据库的迁移

1. 准备

   首先安装entity framework ,

   Install-Package EntityFramework

   接着创建两个我们自己的context,

   

   MyFirstContext.cs

   using System.Data.Entity;
   
   namespace Question.EntityFramework
   {
       public class MyFirstContext : DbContext
       {
           public MyFirstContext() : base("MyFirst")
           {
           }
       }
   }
   

   MySecondContext.cs

   using System.Data.Entity;
   
   namespace Question.EntityFramework
   {
       public class MySecondContext : DbContext
       {
           public MySecondContext() : base("MySecond")
           {
           }
       }
   }
   

2. 添加Migrations文件夹
   

   enable-migrations -ContextTypeName Question.EntityFramework.MyFirstContext -MigrationsDirectory FirstMigrations

   enable-migrations -ContextTypeName Question.EntityFramework.MySecondContext -MigrationsDirectory SecondMigrations

   ContextTypeName:需要迁移的数据库(类)

   MigrationsDirectory:指定迁移文件的目录

   
3. 创建迁移记录

   创建2个实体类,MyFirstEntity.cs和MySecondEntity.cs

   

   然后继续在程序包管理器控制台中输入:

   add-migration Initial -ConfigurationTypeName Question.EntityFramework.FirstMigrations.Configuration
   add-migration Initial -ConfigurationTypeName Question.EntityFramework.SecondMigrations.Configuration

   -ConfigurationTypeName:指定使用的迁移配置  对应不同的文件夹下的不同命名空间的迁移配置

   
4. 生成数据表

 最后配置好web.config输入:

update-database -ConfigurationTypeName Question.EntityFramework.FirstMigrations.Configuration

update-database -ConfigurationTypeName Question.EntityFramework.SecondMigrations.Configuration

大功告成

EF CodeFirst,同项目多个数据库的迁移

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