PRB: Error 40041 When Calling RDO Parameters Through User Connection

• Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0

SYMPTOMS

Referencing parameters by name using the User Connection Designer (UCD) generates the following error:

Error 40041 "Object collection: Couldn't find item indicated by text".

CAUSE

When calling parameters by name using UCD or Remote Data Objects (RDO), each parameter's name should be preceded by an "@." When viewing the parameter's properties, the "@" prefix is removed from the parameter name. This causes RDO not to recognize the parameter anymore and error 40041 occurs.

RESOLUTION

Here are two ways to work around this behavior:

• Once the error 40041 occurs, the only way to work around it is to recreate the UserConnection object.


- or -


• Reference parameters by their position in the parameters collection.

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

Stored Procedure

     CREATE PROCEDURE Test @ID1 int,
                           @ID2 int
     AS
     DECLARE @RetParam int
     SELECT @RetParam = @ID1 + @ID2
     RETURN @RetParam
     Go 

Create the UserConnection

1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.



2. From the Project menu, select Components, click the Designers tab, then select "Microsoft UserConnection."



3. From the Project menu, choose Add ActiveX Designer, and then select Microsoft UserConnection.



4. Double-click UserConnection1. This opens a dialog box named UserConnection1 Properties.



5. On the Connection tab, select either a DSN or DSN-less connection and fill in the appropriate information. On the Authentication tab, leave User Name and Password blank. In the ODBC Prompt Behavior drop-down list box, choose Never.



6. Click OK to save this information and return to the Designer window.



7. Alternate click UserConnection1 and choose Insert Query. This opens a dialog box named Query1 Properties.



8. Insert the source of the Query to be based on the stored procedure, and then select the Test stored procedure.



9. On the Parameters tab, Select ID1 then Select ID2.



10. Click OK to save this information and return to the Designer window.

Visual Basic Code

1. Add a command button named Command1 to Form1.



2. Paste the following code in the General Declaration's section of Form1:




       Option Explicit
       Dim cn As New UserConnection1
       Dim qry As New rdoQuery
       Dim lngTemp As Long
       Dim intReturn As Integer
       Dim er As rdoError

       Private Sub Command1_Click()

       On Error GoTo UC_Error
       ' Establish connection.
       cn.EstablishConnection rdDriverNoPrompt

       Set qry = cn.rdoQueries("Query1")

       qry("@ID1") = 2
       qry("@ID2") = 3
       qry.Execute

       lngTemp = qry.rdoParameters("RETURN_VALUE")

       ' Check to see if you have a return value.
       If lngTemp = vbNull Then
          MsgBox "Sorry no value was returned back", , "Error occurred"
          GoTo Free
       Else
          intReturn = lngTemp
       End If

       MsgBox "Sum of ID1 and ID2 = " & intReturn, , "Output"

    Free:
       Set qry = Nothing
       Set cn = Nothing
    Exit Sub

    UC_Error:
   For each er in rdoErrors
      MsgBox er.Number & ": " & er.Description
   Next er

    End Sub 

3. Press the F5 key to run the program. This causes error 40041 to occur.

REFERENCES

For more information on the connection designer, please refer to the following Microsoft Knowledge Base article:

Q166281 HOWTO: Create and Implement a UserConnection

Additional query words:

Keywords          : kbDatabase kbRDO kbSQLServ kbUCDesigner kbVBp 
Version           : WINDOWS:5.0,6.0
Platform          : WINDOWS 
Issue type        : kbprb 

Last Reviewed: July 13, 1999