Question

By removing EdmMetadata table in EF 4.3, It seems DropCreateDatabaseIfModelChanges no longer works. does it?

OR

Is there a way to declare initializer as I do in SEED method of EF 4.2 ?

Answer 1

EdmMetadata is obsoleted in EF 4.3 Code First models, instead it use _MigrationHistory table to check compatibility between Model and Database.

(Note that the _MigrationHistory table is made a system table if possible. This means that to see it you may need to expand the “System Tables” in SQL Management Studio or your preferred tool.)

In EF 4.3, when DbContext is used with the Code First approach, Database.Create attempts to use Code First Migrations to create the database and perform DDL. Database.Create performs an initial automatic migration for you. As part of this process, migrations will create a table called _MigrationHistory and insert a row into this table containing a compressed version of your Code First model. And DropCreateDatabaseIfModelChanges initializers use the Database.CompatibleWithModel method to determine whether or not the Code First model matches the model that was used to create the database by checking _MigrationHistory table.

http://blog.oneunicorn.com/2012/01/13/ef-4-3-beta-1-what-happened-to-that-edmmetadata-table/