11/10/2023 0 Comments Ef update database command![]() ![]() NET Core are basically like Filters in MVC. Using (var scope = ())įoreach (var context in ()) The code looks like so : public class MigrationStartupFilter : IStartupFilter where TContext : DbContext NET Core has this new paradigm of a “StartupFilter”. For example, a single machine of a low use web app probably doesn’t need all the bells and whistles for a separate database rollout, it just needs to be on the latest version at any given time.įor that. ![]() This is good for projects that the timing of the database migration really doesn’t matter or is an incredibly small rollout window. In some cases, you really don’t care when migrations are run, you just want them to migrate the database when the app starts. For example, if you roll a manual process of updating the production database, it can be useful to see if it’s actually up to date. Even then, it can be useful to know which state the database is in from an admin panel or similar just to diagnose production issues. It can also be extremely handy checking which migrations need to be run before attempting to run them. That’s it! Crazy crazy simple! Checking Pending Migrations Where _context is simply your database context. Related posts: Migrating EF Core Database From C#.This approach would work just as well with any combination of build and release tools such as Team City, Octopus Deploy, etc. ![]() While it’s not as automatic as we might have liked, running EF Core migrations in Azure DevOps is still pretty easy. Set this task up to find the SQL script we created in the build and run it against the corresponding database. Then, over in my release pipeline add step to run a SQL scripts. This directs the migration code to generate a script that can be run on an existing database and only apply any missing migrations. $dbContext is the class name of the DbContext (without namespacing). $scriptName is the name of SQL script we will run during deployment. $stagingDir is my artifact staging location. My build is run under psake and here is the relevant line: dotnet ef migrations script -output $stagingDir\SQL\$scriptName -context $dbContext -idempotent I went through several different approaches to handling this until I settled on what I think is the cleanest: have your build process generate the migration scripts, package them as artifacts, and run them at deployment time. For example, if you need to access a private NuGet feed within your project, it does not authenticate for you like in a build pipeline. The second problem, that I learned the hard way, is that even with the source available in the release pipeline, building the code there is not quite the same as building in the build pipeline. We would need to package up the source as an artifact of the build so we could pass it over to the the release pipeline. There are two problems with that… First, we don’t have ready access to the source in the release pipeline. But we don’t want to do that–database update is a deployment activity and belongs in our release pipeline. This would be fine if we want to apply the database migrations in the build pipeline. However, the ‘dotnet ef’ command builds the source so it can apply the database updates. Given that Microsoft is responsible for creating this support, you might think that the Azure DevOps build and release pipelines would have great support for EF migrations and it would be simple to drop migrations right in. EF Core Migrations in Azure DevOps: The Problem Your database gets brought up to the latest version–whether that means applying just the most recent migration or two or creating the entire schema. When you are ready to apply those migrations to your database, there’s another command: dotnet ef database update Just create your models in C# code, then use a simple command to generate the migrations: dotnet ef migrations add InitialMigration EF Core (Entity Framework Core) code-first approach makes schema management easy with the migrations feature. ![]()
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