How to update-database Programmatically in EntityFramework Codefirst?

asp.net-mvc c#-4.0 entity-framework

Question

i am writing a simple CMS over ASP.NET MVC framework (for college final project).my problem is with module's data-migration strategy.as each module will update the database schema when it is installed , a database migration mechanism must be implemented in module installation system.ok , data-migration in entity framework is already there (thanks to MS) , but the migration commands run in package manager console.is there any way to run a Data-Migration code Programmatically? any help is very appreciated.

1
11
11/12/2012 11:01:54 AM

Accepted Answer

This class exposes the EF migrations in code:

System.Data.Entity.MigrateDatabaseToLatestVersion

In EF, migrations work on a whole database though - not modular parts of one.


Just found this class too:

System.Data.Entity.Migrations.DbMigrator

10
11/12/2012 11:33:49 AM

Popular Answer

If you've enabled the automatic migrations in Package Manager Console you can use the following code in an init section of your app (e.g. in SimpleMembershipInitializer):

var migratorConfig = new Migrations.Configuration();
var dbMigrator = new DbMigrator(migratorConfig); 
dbMigrator.Update();

Where Migrations.Configuration is the migration configuration class placed in your project into your namespace (YourProjectNamespace.Migrations).

If you use it programmatically you should at first turn off the EF initializer:

Database.SetInitializer<YourDBContext>(null);

The thing is the programmatic update creates a database if it doesn't exist.



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