How do I get a scalar value from a stored proc using Nettiers

Question

I have a really simple stored procedure that looks like this:

CREATE PROCEDURE _Visitor_GetVisitorIDByVisitorGUID
(
 @VisitorGUID AS UNIQUEIDENTIFIER
)

AS

DECLARE @VisitorID AS bigint

SELECT @VisitorID = VisitorID FROM dbo.Visitor WHERE VisitorGUID = @VisitorGUID

--Here's what I've tried 
RETURN @VisitorID 'Returns an IDataReader
SELECT @VisitorID 'Returns an IDataReader
--I've also set it up with a single output
--parameter, but that means I need to pass
--the long in by ref and that's hideous to me

I'm trying to get nettiers to generate a method with this signature:

public long VisitorService.GetVisitorIDByVisitorGUID(GUID visitorGUID);

Basically I want Nettiers to call ExecuteScalar instead of ExecuteReader. What am I doing wrong?

Answer 1

Why not use the custom data access functionality to call your stored proc with ExecuteScalar? (http://nettiers.com/DataLayer.ashx#Read_Methods:_4)

var vistorId = (long)DataRepository.Provider.ExecuteScalar(CommandType.StoredProcedure, "_Visitor_GetVisitorIDByVisitorGUID");

The body of the stored proc should look like:

Select VisitorID 
FROM dbo.Visitor 
WHERE VisitorGUID = @VisitorGUID

Return

or

Declare @VisitorId bigint
Set @VisitorId = (
                Select VisitorId
                From dbo.Visitor
                Where VisitorGuid = @VisitorGUID
                )

Select @VisitorId

Return

Answer 2

For those wanting to do this programatically, the above example will not work as there is no way to pass the necessary parameter value using any of that method's overrides.

var vistorId = (long)DataRepository.Provider.ExecuteScalar(CommandType.StoredProcedure, "_Visitor_GetVisitorIDByVisitorGUID");

The only way I've found to accomplish this is by passing a DbCommand as a lone argument to the ExecuteScalar method:

int myReturnID = 0;
using (SqlCommand cmd = new SqlCommand()) {
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "sp_MyStoredProcedure";
    cmd.Parameters.Add(new SqlParameter("MyParameter", myParameter));
    myReturnID = (Int32)DataRepository.Provider.ExecuteScalar(cmd);
}