EF 4.3 Code First迁移 - 每次迁移的种子

Question

have recently started using Code First Migrations and was wanting to seed data in each Up method.

is this possible?

Ie.

1. Create database table
2. Fill with data

for Drop:

1. Delete data from joining table
2. delete table

Answer 1

Yes it is possible but you must do it through executing SQL commands. Use Sql method in both Up and Down methods of your migration to execute INSERT and DELETE SQL commands.

Answer 2

public partial class DBInitializer : IDatabaseInitializer<DBContext>
{
    public void InitializeDatabase(DBContext context)
    {

        var cfg = new Migrations.Configuration();
        var migrator = new DbMigrator(cfg);

        List<string> pendingMigrations = new List<string>(migrator.GetPendingMigrations());

        foreach (string migration in pendingMigrations)
        {
            Console.WriteLine("Updating Migration:" + migration);
            migrator.Update(migration);
            Console.WriteLine("Updated Migration:" + migration);

            if (migration.Contains("AddMyProperty"))
            {
                // seed data codes
                context.SaveChanges();
            }                
        }

    }

}