entity-framework - EF - code first - 自动更新数据库

Question

我想在我的代码中使用自动迁移，但每次我更改模型中的某些内容时，我都需要手动运行 update-Database。我可以自动执行吗？

这是配置:

public class Configuration : DbMigrationsConfiguration<ManualContext>
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = true;
        AutomaticMigrationDataLossAllowed = true;
    }
    ...
}

和AppActivator:

[assembly: WebActivator.PreApplicationStartMethod(typeof(AppActivator), "PreStart")]
[assembly: PostApplicationStartMethod(typeof(AppActivator), "PostStart")]
[assembly: ApplicationShutdownMethod(typeof(AppActivator), "Stop")]

namespace Manual.Web
{
  public static class AppActivator
  {
    public static void PreStart()
    {
      Database.SetInitializer(
               new MigrateDatabaseToLatestVersion<ManualContext,Configuration>());
      Database.SetInitializer(new ManualDbInitializer());

      MeasurementConfig.RegisterUnits();
      MiniProfilerPreStart();
    }
    ...
  }

和 ManualDbInitializer - 用于种子(第一次创建数据库时):

public class ManualDbInitializer : CreateDatabaseIfNotExists<ManualContext>
{
    protected override void Seed(ManualContext context)
    {
        ManualDbInitializerSeed.SeedForDB(context);
    }
}

Answer 1

If you are deploying your application you may want it to automatically upgrade the database (by applying any pending migrations) when the application launches. You can do this by registering the MigrateDatabaseToLatestVersion database initializer. A database initializer simply contains some logic that is used to make sure the database is setup correctly. This logic is run the first time the context is used within the application process (AppDomain).

http://msdn.microsoft.com/en-us/data/jj591621#initializer