Personally I can see nothing wrong with the first approach. Yes, you have to create a default constraint to add a non-nullable column to a non-empty dataset. And yes, you have to delete it afterwards if you need to make sure the new column is always added explicitly in the future, as per your requirement. … Read more
EF Core creates its migrations by comparing your models to the current database snapshot (a c# class). It then uses this to create a migration file you can review. However, EF Core cannot always know if you replaced this column or created a new column. When you check your migration file, make sure there are … Read more
All the examples I’ve seen involve either hard-coding the connection string or putting it in my ASP.NET Core application’s settings files. If you aren’t using ASP.NET Core, or maybe, I don’t know, don’t want to have your local environment’s database details committed to source control, you can try using a temporary environment variable. First, implement … Read more
This answer explains why it happens. To resolve it I call add-migration and name it MERGE and then remove any duplicate migration code that has already happened. This is just to update the model snapshot to reflect the merged model. Example: public partial class MERGE : DbMigration { public override void Up() { // Intentionally … Read more
Here is how I did it: [DatabaseGenerated(DatabaseGeneratedOption.Computed)] public DateTime CreatedDate{ get; set; } in my migration’s Up() method: AddColumn(“Agents”, “CreatedDate”, n => n.DateTime(nullable: false, defaultValueSql: “GETUTCDATE()”));
This may be in two reasons: There is some other DbContext in code, that’s why automatic migrations could not decide, which context to use. There is some new change, which loops a comparison of schema and code model, so EF simply could not find the difference. In general, automatic migrations are simple and fast to … Read more
You can specify connection string via ConnectionString parameter: Update-Database -ConnectionString “data source=server_name;initial catalog=db_name;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework” -ConnectionProviderName “System.Data.SqlClient” -Verbose Also you need to use this parameter with the same value for Add-Migration command: Add-Migration Version_Name -ConnectionString “data source=server_name;initial catalog=db_name;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework” -ConnectionProviderName “System.Data.SqlClient” -Verbose
The best way should be using new MigrateDatabaseToLatestVersion initializer. Database.SetInitializer<YourContext>( new MigrateDatabaseToLatestVersion<YourContext, YourMigrationsConfig>()); Database.Initialize(false);
In VS 2015, I just restarted the IDE and the dropdown was filled again.
In EF Core 5.0, you will pass the connection string in the command line like this, dotnet ef database update –connection “connection string” Reference: https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-5.0/whatsnew#new-command-line-parameters-for-namespaces-and-connection-strings