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T-SQL/ADO - Can you call a UDF directly from ADO?

Posted on 2006-11-10
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Last Modified: 2009-12-16
Just a quick question...is there a way to call a UDF from ADO without using a wrapper stored procedure?

For example, here's a mock-up function:

CREATE FUNCTION fn_UserExists (@intUserID INT)
RETURNS INT
BEGIN
DECLARE @RetCode INT
SET @RetCode = 0
SELECT @RetCode = CASE WHEN @intUserID IN (SELECT intUserID from tblUser) THEN 1 ELSE 0 END
RETURN @RetCode
END

I'd like to call it from an ASP page using the ADO Command object.  The only way so far that I've gotten to work is to create a wrapper procedure like this:

CREATE PROCEDURE sp_UserExists (@intUserID INT)
AS
BEGIN
DECLARE @RetCode INT
SET @RetCode = 0
SELECT @RetCode = dbo.fn_UserExists(@intUserID)
RETURN @RetCode
END

Then I call it like this:

Function UserExists (conn, intUserID)
      Dim cmd
      Set cmd = server.createobject("ADODB.Command")

      cmd.CommandText = "sp_UserExists"
      cmd.ActiveConnection = conn
      cmd.CommandType = adCmdStoredProc
      cmd.Parameters.Append cmd.CreateParameter("return", adInteger, adParamReturnValue, 4, 0)
      cmd.Parameters.Append cmd.CreateParameter("@intUserID", adInteger, adParamInput, 4, intUserID)
      cmd.Execute

      UserExists = cmd.parameters("return").value
      Set cmd = Nothing
End Function



I need the function to call in other situations within SQL but it seems redundant to have a proc out there just to call the function.  Does anyone know of a better way?

Thanks in advance!
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Question by:ShantiSmurf
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2 Comments
 
LVL 29

Accepted Solution

by:
Nightman earned 200 total points
ID: 17917666
From ADO, you execute this string SQL Statement:
"SELECT dbo.fn_UserExists (" & myint & ")"

That might work.
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Author Comment

by:ShantiSmurf
ID: 17917788
Perfect!  It's so simple, I can't believe I didn't see it earlier hehe  That's just what I was looking for.  I'm calling it like this:

UserExists = conn.Execute("SELECT dbo.fn_UserExists (" & intUserID & ")").GetString()

Just right!  Thanks!
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