How To Call SQL Server System Stored Procedures from RDO

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This article describes how to call system-stored procedures on SQL Serverfrom RDO.

SQL Server has a number of prewritten, stored procedures that are used toconfigure and administer the SQL server. They are all located in the Masterdatabase and have the prefix [ASCII 147]sp_,[ASCII 148] which distinguishes them fromuser- or application-written stored procedures.

In order to call these stored procedures from RDO, you must specify thecorrect database in which they reside, the master database. There areseveral ways to do this, but the most effective way is to explicitlyreference the stored procedure in your call syntax. For example:
   { ? = call master.dbo.sp_addlogin(?,?) }				

Another method to accomplish this behavior is to set the default databasebefore creating and executing your stored procedure. The following exampleuses a prepared statement and assumes that "Pubs" is your default database,cn is an active rdoConnection object, and qr is an rdoQuery object:
   cn .Execute "Use Master"   qr.SQL  = "some sql to execute..."   Set qr.ActiveConnection = cn   qr .Execute   cn .Execute "Use Pubs"				
  1. Start a new Standard EXE project. Form1 is created by default.
  2. Add a CommandButton (Command1) to Form1.
  3. From the Project menu, select References, and place a check next to Microsoft Remote Data Object 2.0.
  4. Paste the following code into the General Declarations section of Form1:
          Private Sub Command1_Click()         Dim cn As New rdoConnection         Dim qr As New rdoquery         With cn         .Connect = "Driver={SQL Server};Server=MyServer;" & _                  "Database=pubs;Uid=<username>;Pwd=<strong password>"         .EstablishConnection Prompt = rdDriverNoPrompt         End With         With qr            Set .ActiveConnection = cn            'Note: If you don't specify master, you will get the following            'error: "An invalid parameter was passed."            .SQL = "{ ? = call master.dbo.sp_addlogin(?,?) }"            .Prepared = True            .BindThreshold = 1024 'largest column that will be bound under                                  'ODBC.            Debug.Print .rdoParameters.Count            .rdoParameters(0).Direction = rdParamOutput            .rdoParameters(1).Direction = rdParamInput            .rdoParameters(2).Direction = rdParamInput            .rdoParameters(1) = "Edward"            .rdoParameters(2) = "Scissorhands"            .Execute            Debug.Print .rdoParameters(0).Value            'Const SQL_SUCCESS As Long = 0            'Const SQL_ERROR As Long = -1         End With      End Sub						
  5. Note that you need to change your DATABASE, UID, and PWD parameters in the Connect Property.
  6. Start the program or press the F5 key.
  7. Click the Command1 button to execute the stored procedure and display the parameter count and the output parameter in the debug window.
In Visual Basic Books Online, please see:
  Guide to Building Client Server Applications in Visual Basic (Enterprise)    Part 3: Data Access Options      Using Remote Data Objects and the Remote Data Control        Using RDO to Execute Stored Procedures				

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions byJon Fowler, Microsoft Corporation
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Article ID: 166211 - Last Review: 02/21/2014 00:28:32 - Revision: 2.1

Microsoft Visual Basic 5.0 Enterprise Edition, Microsoft Visual Basic 6.0 Enterprise Edition

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