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Microsoft: Access Modules (VBA Coding) FAQ

How To

Sequentially Increment a Text Field by tviman
Posted: 31 Aug 07

If you use a form for data entry, here's an easy way to sequentially increment text fields such as invoice numbers (INV-12345) and purchase order numbers (PO-12345) without relying on an autoincrement field.

Insert the following code in an appropriate event (Onload, OnCurrent, OnClick, etc.) and change the field and table names to match your own.

' Use this line if creating a new record by clicking a button
DoCmd.GoToRecord , , acNewRec

' Me.DataEntry = True   (If you want to enter data as soon as your form opens, use this instead of the above)
If Me.newRecord Then
   Dim varResult As Variant
   varResult = DMax("field-name", "table-name")
   If IsNull(varResult) Then
         'just in case the table is empty
       Me.[field-name] = "PO-4000"   'Use your own format here
       Me.[field-name] = Left(varResult, 3) & Val(Right(varResult, 4)) + 1
   End If
   MsgBox "No new record created!"
End If

Note: This bit of code Left(varResult, 3) & Val(Right(varResult, 4)) + 1 will vary depending on your needs.

I can't take credit for this - I found it somewhere on the 'Net a few months ago and have had great success with it.

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