![]() ![]() ![]() You can see the results of the activities in the SQL explorer:įor the commands Add-Migration and Update-Database several options are available which can be used to tweak the activities. Specify the '-Verbose' flag to view the SQL statements being applied to the targetĪpplying explicit migrations. If you feel confident with your migration, you can apply the migration to the database by using the command: Update-DatabaseĪll pending migrations (in this case the Initial-migration) are applied to the database and afterwards the seed method is applied (the appropriate example) PM> update-database On the other side the method Down() tries to reverse the migration activities. In addition, the relation between the two tables is created by adding the field Author_AuthorId. ForeignKey("dbo.Authors", t => t.Author_AuthorId)ĭropForeignKey("dbo.BlogPosts", "Author_AuthorId", "dbo.Authors") ĭropIndex("dbo.BlogPosts", new ) Īs you can see, in method Up() two tables Authors and BlogPosts are created and the fields are created accordingly. Title = c.String(nullable: false, maxLength: 128), Id = c.Int(nullable: false, identity: true), ![]() Want to include in this migration, then you can re-scaffold it by runningĪ new file timestamp_Initial.cs is created (only the important stuff is shown here): public override void Up()ĪuthorId = c.Int(nullable: false, identity: true), If you make additional changes to your model that you This snapshot is used to calculate the changes to your model when you The Designer Code for this migration file includes a snapshot of your current Codeįirst model. Now apply the command based on the example above to create a migration called Initial: PM> Add-Migration Initial This command will create a new class containing two methods Up and Down that are used to apply and remove the migration. Mapping relationship with Entity Framework Code First: One-to-one and variationsĪfter you've enabled migrations (please refer to this example) you are now able to create your first migration containing an initial creation of all database tables, indexes and connections.Ī migration can be created by using the command Add-Migration.Mapping relationship with Entity Framework Code First: One-to-many and Many-to-many.Inheritance with EntityFramework (Code First).Initial Entity Framework Code First Migration Step by Step.Doing "Update-Database" within your code.Best Practices For Entity Framework (Simple & Professional).Advanced mapping scenarios: entity splitting, table splitting.This step is optional you can continue with the remaining tutorials without having deployed the project. Hope this article will help you to update the Entity Data model in your EF Core project for Database First Approach. The Migrations feature enables you to change the data model and deploy your changes to production by updating the database schema without having to drop and re-create the database. context-dir EFDbContext -output-dir EFDbContext -context DbCoreContext -force ^ Scaffold.bat dotnet ef dbcontext scaffold "Data Source=DESKTOP-TJHLDSD\SQLEXPRESS Initial Catalog=AdventureWorks2014 Integrated Security=true " ^ įor our convenience, we can create a batch file in the project folder so that we just need to double click and it will update the Entity data model and we don't need to remember such a long command. If a new table is added to the database and we need to update the entity data model then we can mention the table with a new -table option like below dotnet ef dbcontext scaffold "Data Source=DESKTOP-TJHLDSD\SQLEXPRESS Initial Catalog=AdventureWorks2014 Integrated Security=true " -context-dir EFDbContext -output-dir EFDbContext -context DbCoreContext -force -table. ![]() If there is any schema change in the table then we can mention the table name with -table in the above command. dotnet ef dbcontext scaffold "Data Source=DESKTOP-TJHLDSD\SQLEXPRESS Initial Catalog=AdventureWorks2014 Integrated Security=true " -context-dir EFDbContext -output-dir EFDbContext -context DbCoreContext -force -table. The database update is very common in any real-time application so sometimes we add a new table or update the existing table by adding a new column, therefore, applications using Entity Framework as an ORM have to update their Entity Data model as well.Įarlier, Entity Framework provided a nice GUI to update the Entity data model for Database First Approach but Entity Framework Core doesn't have any GUI to do the same and can be updated by running the command.įollowing is the command to update Entity Data Model in Entity Framework Core by force as we don't have the option to update rather create again by force. ![]()
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