How does access implement automatic numbering in "default values" with code? Document flow number generation problem.

access| Serial Number | problem
How do I implement automatic numbering in "default value" with code? Document flow number generation problem.


Brief introduction: The issue of document serial number generation




Problem:

How do I implement automatic numbering in "default value" with code? Document flow number generation problem.


How do I implement automatic numbering in "default value" with code?
If I wanted to implement different types of AutoNumber, how would I set up the code?
such as: 1th, number 2nd 、...........、 198th ...........
Or: Cn0001-a, cn0002-b, Cn0003-b 、.........、 cn0004-a, Cn1998-b ...
is the default value of the input code, or where, please advise, thank you!





Reply:

These requirements do not need to be completed in the field properties of the table, which are generally addressed in the interface programming.


Number by using the DCount () or DMAX () function to use a string combination method

Private Sub Field1_enter ()
If IsNull (Field1.value) Then
Field1.value = "CN" & Format (CLng (DMax ("Mid (field1,3,4)", "table1") + 1), "0000") & "-A"
End If
End Sub

Of course, after you know the principle, you have to change the table's "Default value" method to achieve also may not, but personally feel unnecessary.


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