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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:
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