To do this, run the command as follows: Update-DataBase –scriptĪnd the result will be an SQL script file: ALTER TABLE ADD NOT NULL DEFAULT 0 Now we will send the command to the database, but in a slightly different way, we will generate an SQL script. Obviously, you could have set this as a default value for the database, but the purpose here is to show you how to send commands during the Migrations process. Public partial class Cliente_Active : DbMigrationĪddColumn( "Clients", "Active", c => c.Boolean(nullable: false)) See that when running Add-Migrations, a new file was added to the project, containing the Migrations commands for the database: Update-DataBase - script - generates a script with SQL commands to be executed on the database.įor our example, we will run: Add-Migrations "CreateDatabase†Now, for all the changes we make to the classes, we will basically execute two commands: Add-MigrationsĪdd-Migrations "name_migrations" - creates a change in the database, where "name_migrations" is the name you will give for the update Update-DataBase - apply changes to the database We will do this using the Nuget window again using the Enable-Migrations command:Īfter this command, a new class will be added to our project, let name it Configurations:Īs we will work with the manual process, we will leave this class as it is and we will start with the Migrations commands, which must be executed in the NuGet window: Regardless of the method: manual or automatic, we need to add it to our project. We will initially add Migrations to our project. Migrations - Managing each update in the database Now that we have our classes and the configuration file, let's play with Migrations. We will also add an app.config file to identify our SQL server and the name of the database: We will now create a Context and a class so that we can work with Migrations. To do this, open the NuGet manager in Tools -> Library Package Manager -> Package Manager Console and type:Īfter that, we will have EF Code First installed in our project. Right after creating the project, we will add the Entity Framework Code First using NuGet. Let's start by creating a console type project, using the. I'm using Visual Studio 2012, but you can also use Visual Studio 2010. Creating the sample projectīefore we start, let's create our sample project. In this article, we will cover the two methods of using Migrations, and after understanding each one, you will be able to choose the one that best suits your requirement. But if what interests you is to keep the database always updated, without worrying about running scripts, then use the automatic mode. Use the fully automatic mode, where you don't have to worry about updating the database because when you run your program, this will be done automatically.īut which of the two models should I use in my application? And the answer is: It depends! If you need strict control of modifications, if you need to generate scripts that will be executed in your production environment, it is best to use the manual mode.Use migration points in the database, where we can move forward, applying the latest changes, or go back in the timeline, at any time in the database.In practice, we have two ways of working with Migrations: Migrations allow you, who already work with CodeFirst, to generate manageable updates in your database, or if you prefer, let Migrations itself take care of everything automatically, keeping your database always up to date with your classes. One of the great features of Entity Framework Code First is the process of automatically updating the database through the feature called Migrations. Using Entity Framework Power Tools for Code First Development Using Entity Framework Code First to map POCO classes to the database Understanding Entity Framework Code First Migrations Title: Improve Entity Framework Performance with NGen Migrating to Entity Framework 6: New Features to Explore Meta title: How to use Stored Procedures with Entity Framework Code First Managing Connection Strings in Entity Framework Code First Installing and Accessing Entity Framework 6 Nightly Builds Improve Entity Framework Performance with EFProfiler Improve Entity Framework 6 Performance by Pre-compiling the DLL Implementing Entity Framework Command Interception in Code How to Use AsNoTracking in Entity Framework to Avoid Unintentional Changes How to Reverse Engineer Tables and Views with EF Code First How to Install Entity Framework Power Tools in Visual Studio 2015 How to Create Index in Database with Entity Framework Code First How to Create a Visual Model with Entity Designer in Entity Framework Creating Generic Queries with LINQ in Entity Framework 4
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