How to Use ADO with Visual Basic

This article was previously published under Q172403
For a Microsoft Visual Basic .NET version of this article, see 308656.
Adovb.exe is a self-extracting compressed file containing sample code thatdemonstrates how to use ActiveX Data Objects (ADO) within Visual Basic.
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What Adovb Demonstrates

Adovb demonstrates proper use of output and return parameters (for SQLServer), and opening a parameterized recordset for both a Microsoft Access and SQL Server data sources. Also included is a generic template for error handling with ADO code:
   Private Sub cmdTemplate_Click()      Dim Conn1 As adodb.Connection      On Error GoTo VbError   ' Trap (non-ADO) error/exceptions      ' Create Connection Object (using early binding)      Set Conn1 = new ADODB.Connection      On Error GoTo AdoError  ' Trap any error/exception      Conn1.ConnectionString = AccessConnect      Conn1.Open      '----------------------      ' YOUR CODE GOES HERE!      '----------------------      ' Successful Shutdown      Conn1.Close   Done:      ' Miscellaneous (graceful) Cleanup      On Error Resume Next      Set Conn1 = Nothing      Exit Sub   ' ADO Error/Exception Handler   AdoError:      ' Save Error Information!      ErrNumber = Err.Number      ErrSource = Err.Source      ErrDescription = Err.Description      AdoErrorEx List1, Conn1   ' Non-ADO Native error/exception handler   VbError:      VbErrorEx List1, ErrNumber, ErrSource, ErrDescription      GoTo Done   End Sub				
  • When using ADOVB with ADO 2.0 or later, you should remove the Reference to Microsoft OLE DB ActiveX Data Objects 1.0, and set a Reference to the latest version of Microsoft ActiveX Data Objects available.
  • When using ADO 2.0 or later, referencing the OriginalValue property of an ADO Field object will give the following error, if the LockType of the ADO Recordset is Read Only:
    Run-time error '3251': The operation requested by the application is not supported by the provider.
    To avoid this error in ADOVB, comment out or remove the following line of code, in the Click event procedure for cmdAccess in the code window for frmADOVB:
    List1.AddItem vbTab & "OriginalValue= " & rs1.Fields(i).OriginalValue					

About the ADO* Series of Samples

This is one of several identical samples implemented using ADO withinvarious products, as listed below. The advantage is that these articleshave an identical interface/functionality, demonstrating both thesimilarities and differences in using ADO with different languages / mechanisms:
172403 FILE: Adovb.exe Demonstrates How to Use ADO with Visual Basic
220152 Sample: ADOVC1 Simple ADO/VC++ Application
185033 FILE: Adoacc.exe Demonstrates Using ADO with Access 97

Αναγνωριστικό άρθρου: 172403 - Τελευταία αναθεώρηση: 03/02/2005 19:22:30 - Αναθεώρηση: 3.4

Microsoft ActiveX Data Objects 1.5, Microsoft ActiveX Data Objects 2.0, Microsoft ActiveX Data Objects 2.1 Service Pack 2, Microsoft ActiveX Data Objects 2.5, Microsoft ActiveX Data Objects 2.6, Microsoft ActiveX Data Objects 2.7, Microsoft Visual Basic 5.0 Professional Edition, Microsoft Visual Basic 6.0 Professional Edition

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