Code First Migrations: Alpha 2 Released

What Changed

The short answer… a lot! You gave us a lot of feedback on our first alpha and we summarized it in the ‘Code First Migrations: Your Feedback’ blog post. The changes are pretty widespread so we would recommend reading the Code First Migrations Alpha 2 Walkthrough to get an overview of the new functionality. Here are some of the more notable changes:

• We did a lot of work to improve the ‘no-magic’ workflow, including a code based format for expressing migrations. Our walkthrough also starts with the no-magic approach and then shows how to transition to a more-magic approach for folks who want to use it.
• A provider model is now available. Providers need to inherit from the System.Data.Entity.Migrations.Providers.DbMigrationSqlGenerator base class and are registered in a new Settings class that is added when you install the NuGet package. Alpha 2 includes a provider for SQL Server (including SQL Azure) and SQL Compact.
• We’ve taken a NuGet package name change. Alpha 1 was released as EntityFramework.SqlMigrations, but given the design changes that name makes less sense. We have now dropped the ‘Sql’ and are now just EntityFramework.Migrations.
• We’ve improved how we do type resolution to find your context etc. In the first preview there were a number of issues around how we discovered your context, especially in solutions with multiple projects. This would result in various errors when trying to run either of the migration commands. We’ve done some work to make this more robust in Alpha 2.

Code First Migrations: Alpha 2 Released – ADO.NET team blog – Site Home – MSDN Blogs

具体的な変更点はWalkthroughの方がわかりやすいと思います。

Code First Migrations: Alpha 2 Walkthrough – ADO.NET team blog – Site Home – MSDN Blogs