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Tip of the Day
Language: VB6
Expertise: beginner
Jul 1, 2000

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On-Demand

Application Security Testing: An Integral Part of DevOps


Updating records in DataList and ADO Data Controls

If you use a DataList control linked to an ADO Data Control and if you want to add a record, you have to create a command button with this code:


Private Sub cmdAdd_Click()
  On Error GoTo AddErr
  datPrimaryRS.Recordset.AddNew
  txtNew.SetFocus
  Exit Sub
AddErr:
  MsgBox Err.Description
End Sub
You can specify the new item through txtNew textbox. To allow the user to save this record, you have to add an other button, with this code in its Click event:

Private Sub cmdUpdate_Click()
  On Error GoTo UpdateErr
  datPrimaryRS.Recordset.Update
  datPrimaryRS.Refresh
  Exit Sub
UpdateErr:
  MsgBox Err.Description
End Sub
However, if you execute this example and try to add a new item, you'll notice that even after pressing the cmdUpdate button, the new item won't appear in the DataList. To correct this problem, you have to add a call to Requery method before Refresh. This is the correct code:

Private Sub cmdUpdate_Click()
  On Error GoTo UpdateErr
  datPrimaryRS.Recordset.Update
  datPrimaryRS.Recordset.Requery
  datPrimaryRS.Refresh
  Exit Sub
UpdateErr:
  MsgBox Err.Description
End Sub
Marco Bellinaso
 
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