Asp.net core add database views in new migration

In ASP.NET Core, you can add database views in a new migration using the following steps:

1. Create a new migration:

In the Package Manager Console, run the following command:

Add-Migration <MigrationName>

Replace <MigrationName> with a name for your migration, such as "AddDatabaseViews".

2. In the generated migration file, add the CreateView method:

In the Up method of the migration file, add the following code:

public partial class AddDatabaseViews : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.Sql(@"CREATE VIEW MyView AS SELECT * FROM MyTable");
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.Sql(@"DROP VIEW MyView");
    }
}

Replace MyView and MyTable with the actual names of your view and table.

3. Run the migration:

In the Package Manager Console, run the following command:

Update-Database

This will apply the migration and create the database view.

4. Verify the view:

In the database, you can verify that the view has been created by running a query like this:

SELECT * FROM MyView

This should return the data from the underlying table.

Note: Make sure to replace MyView and MyTable with the actual names of your view and table.

Also, you can use CreateStoredProcedure method to create a stored procedure which can be used to create a view.

migrationBuilder.Sql(@"CREATE PROCEDURE MyProcedure AS SELECT * FROM MyTable");

And then you can use CreateView method to create a view based on the stored procedure.

migrationBuilder.Sql(@"CREATE VIEW MyView AS EXEC MyProcedure");

It's also important to note that views are not stored in the database, they are just a virtual table based on the result-set of a SELECT statement. So, when you run a query on a view, the database will execute the underlying SELECT statement and return the result-set.