Partial mapping in Entity Framework 4
- by Dimi Toulakis
Hi guys,
I want to be able to do the following:
I have a model and inside there I do have an entity.
This entity has the following structure:
public class Client
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
}
What I want now, is to just get the client name based on the id.
Therefore I wrote a stored procedure which is doing this.
CREATE PROCEDURE [Client].[GetBasics]
@Id INT
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
SELECT
Name
FROM Client.Client
INNER JOIN Client.Validity ON ClientId = Client.Id
WHERE
Client.Id = @Id;
END
Now, going back to VS, I do update the model from the database with the stored procedure included.
Next step is to map this stored procedure to the client entity as a function import.
This also works fine.
Trying now to load one client's name results into an error during runtime...
"The data reader is incompatible with
the specified 'CSTestModel.Client'. A
member of the type, 'Id', does not
have a corresponding column in the
data reader with the same name."
I am OK with the message. I know how to fix this (returning as resultset Id, Name, Description).
My idea behind this question is the following:
I just want to load parts of the entity, not the complete entity itself.
Is there a solution to my problem (except creating complex types)? And if yes, can someone point me to the right direction?
Many thanks,
Dimi
