Expression/formula as column mapping (calculated fields)

Hello,

I know that this is not the design of an entity-table mapping, but is there a way to create some kind of formula or expression mapping? NHibernate has something like this Nhibernate mapping property I would think about somthink like :

        [Table("CUSTOMER")]
	public partial class Customer
	{
		[Column("ID"), PrimaryKey,  NotNull] public int    Id { get; set; } 
		[Column(), NotNull] public string Name { get; set; } 
		[Column(),  NotNull] public string FirstName { get; set; } 
		[Column(), Nullable         ] public string Company { get; set; } 
		[Column(),  NotNull] public string ZipCode { get; set; }
		[Column(), NotNull] public string Town { get; set; }
                [Column(Expression="select s.STATUS from CUSTOMER_STATUS s where s.CUSTOMER_ID = {Id}")
public int CustomerStatus{ get; set; } 
	}

To access the Customer properties, you could write the property as curly brackets, or access it directly with column name : [Column(Expression="select s.STATUS from CUSTOMER_STATUS where s.CUSTOMER_ID = ID")]

[igor-tkachev]

Let’s add a flag like IsColumn/IsExpressionColumn/IsWhateverColumn to ExpressionMethod attribute. It will cover this case and will not conflict with the library design.

[frankiDotNet]

I see, thanks!!