实体框架新表

Question

I updated the project from Entity Framework 5 to 6 and when I start my project a new table is created in the db: dbo.__MigrationHistory . I am using code first and I will guess this is to keep track to the history right?

This was not created there in EF 5.

How can I prevent this table to be created?

Answer 1

when automatic updates run against a database they should apply all changes they can find. There is a system table on the database called migration history that helps with this. you can manipulate Migration Table but I don't sure that you can disable of creating it. see this link http://entityframework.codeplex.com/wikipage?title=Migrations%20History%20Table%20Customization

Answer 2

one of Entity framework specification is Idempotent migrations scripts

it's obvious that package manager Already Enabled-Migration so you have to disable it using

 AutomaticMigrationsEnabled = false;

then set your Initializer

Database.SetInitializer<YourContextType>(new CreateDatabaseIfNotExists());

Answer 3

In Entity Framework 5 this table was a system table if the application used Microsoft Sql Server database. This has changed in Entity Framework 6

Code First needs the Migration History table so you can't remove it, but you can customise it

Reference: Customizing the Migrations History Table