![]() A new migrations table will now have been created in the CodeFirstFromExistingDB database.įollowing this, add a new property named Description to the Product class, with a maximum allowed length of 50 characters, as follows: Next, run the update-database command in order to update the existing database with the initial migration. Running it will add an entry to the migrations table in the database, thus creating a snapshot of its original schema. The key part of this command is the -IgnoreChanges flag, which ensures that a migration is created that effectively does nothing. To create an initial blank migration for the database, type the following command into Package Manager Console:Īdd-Migration InitialCreate -IgnoreChanges ![]() This will not work because the products and categories tables already exist in the database, so we need to create an initial blank migration and then later we will be able to add a migration for any new changes. If we create a migration now, it will attempt to add all our entities to the database. This is where you need to add an extra step for an existing database. Next we want to create our migrations to run. This will create a Migrations folder and add a Configuration.cs file to it. In Package Manager Console, type the following command (we need to specify the context to use because we included authentication in the project and this uses its own context by default):Įnable-Migrations -ContextTypeName CodeFirstExistingDB.StoreContext The typical way to do this is to use migrations however, using Code First with an existing database requires a little extra care to work correctly.įirst of all, you must enable migrations for the project. ![]() There is going to come a point where you will want to update your existing database model from your code. ![]()
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