How to recreate database in EF if my model changes?

Question

I created a DbContext like so :

   public class myDB : DbContext
   {
     public DbSet Parties { get; set; }
     public DbSet B         


        

Answer 1

I believe you're looking for:

Database.SetInitializer<ClubmansGuideDB>(new DropCreateDatabaseIfModelChanges<ClubmansGuideDB>());

As of EF 4.1 and above.

Note that this assumes you have permission to even drop your database. I do this locally for ease of development but disable it in staging/production (I do a manual Schema Compare and push my changes).

By the way, for testing, if you need to force recreate the database, you can do:

using (var context = new ClubmansGuideDB()) {
    context.Database.Initialize(force: true);
}

(using if you don't already have a reference to your DB)

Answer 2

Try putting this in your Global.asax.cs Application_Start() method.

Database.SetInitializer<DatabaseContext>(null);

To reset the database from scratch on app run make a class like this

//Where myDB is your context
public class EntityBase: DropCreateDatabaseAlways<myDB>
{

} 

Then in your Application_Start() method you can do this

Database.SetInitializer(new EntityBase());

Answer 3

You can let the Entity Framework recreate the whole database by using a Database Initializer or if you want to migrate data you can look at the Code First Migrations

The following would recreate your database when the model changes:

Database.SetInitializer<myDB>(new DropCreateDatabaseIfModelChanges<myDB>());