To create and update the database, follow the commands: Once we create with the Migration Snapshot, we have to create the Database, Create or Updating the Database. ModelSnapshot.cs is the snapshot of the current model this file is used to establish the changes made while generating the subsequent migration._.cs is a migrations metadata file that includes the information used by Entity Framework Core.The Up () method contains the coding for creating Database Objects, and the Down () method contains the coding for eliminating/ removing the Database Objects. _.cs is the main migration file that contains the operation of migration in the methods of Up() and Down(). In the above commands, the name MyFirstMigration is the name of the Migration once we create the migration, it automatically creates three files in the Migration Folder of the project as shown, dotnet ef migrations add MyFirstMigration.You were using the dotnet Command Line Interface run the command as follows: Initially open the PMC (Package Manager Console) from Toolsà NuGet Package Manager à Package Manager Console in VS and run the commands as follows, Instead of that, we need to create migration. To add the new migration initially, we need to define the initial domain classes here the application has no database, so it can store the data from the domain classes. When we compare the code-first and the database-first approaches, both are comparatively based on the third approach, called model-first. Model first – The model first approach generates the database using the data model created with the EF Designer.Code first – Code first approach defines the data model in the application code and then finally uses the code for generating the new database.Database first – Database first is the reverse engineer approach where the existing database generates the data model and which maps it entirely. Let’s see the three approaches as follows: The Entity Framework offers the three entities which approach the database schema migration. Just open the Console Manager package and execute the following commands as follows:Īdd-migration “initial” // this is to the package console managerĭotnet ef migrations add “initial” // dot net cli Entity Framework Migration Three Entities While creating or altering the domain classes, initially, we need to create the migration for the creation of new migration, we need to use the command that add-migrationin other ways we can also use the command line for adding migration dotnet ef migrations.
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