Entity framework Core Raw SQLQueries with custom model

Question

Using Entity Framework 6, I was able to use execute a Raw SQL Query and use a custom model which was not defined in the DBContext in order to store the output of the query. A si

Answer 1

Here's how I was able to get this working (for completeness):

MyModel.cs:

public class MyModel
{
    // The columns your SQL will return
    public double? A { get; set; }
    public double? B { get; set; }
}

Add class that just inherits from your original EF context class (i called mine DbContextBase):

public class DbContext : DbContextBase
{
    public virtual DbSet MyModels { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        // Necessary, since our model isnt a EF model
        modelBuilder.Entity(entity =>
        {
            entity.HasNoKey();
        });
    }
}

Use that class (instead of your original EF context class):

// Use your new db subclass
using (var db = new DbContext())
{
    var models = await db.MyModels.FromSqlRaw(...).ToListAsync();    // E.g.: "SELECT * FROM apple A JOIN banana B ON A.col = B.col"
}

Notes:

• If you need to, just use FromSqlInterpolated instead of FromSqlRaw
• The "db context" subclass allows you to update EF models without affecting your "polyfill" code
• Works with SQL Server stored procs that return only 1 result set