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Auto increment text field Access 2007

I need code to auto increment a text field.  The field is alpha numeric.  The structure of my field is as follows:
MD-11-0001
MD-11-0002
MD-11-0003
and so on.

The first part is the office, the second part is the 2 digit year and the third is the number that I need to increment. I created a form with an add new record button.  what I need that button to do is create a new record and find the highest numbered control number and add 1.  Based on the above structure.  Also, if possible it would be nice if the coding could add the 2digit year without my intervention.  This is a multi user database, but the access is minimal.  3-4 users.

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newtt13_newtt13
Asked:
newtt13_newtt13
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2 Solutions
 
peter57rCommented:
If the last number for 2011 was md-11-0543
what would be the first number for md-12-
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newtt13_newtt13Author Commented:
0001 would be the new record for the next year.so md-12-0001
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peter57rCommented:
My basic advice would be to use 3 fields for the different parts and that will life generallyeasier.
Especially since you Must enter the department to get anywhere.

However, based on what you asked, and assuming you have a textbox/combo where you enter or choose the dept then you can use a button click event procedure to get the next number.

You would need a function like the one below to be placed in a standard module and called from the button click event.  The code must be amended to use your own table and field names instead of Myxxxx.

Function GetNext(pDept As String)
Dim maxval
Dim prefix As String
prefix = pDept & "-" & Year(Date - 2000)

maxval = DMax("MyId", "Mytable", "left(MyId, 5) ='" & prefix & "'")
If IsNull(maxval) Then
     GetNext = prefix & "-0001"
Else
    GetNext = prefix & "-" & Format(Val(Right(maxval, 4)) + 1, "0000")
End If
End Function

Then I am assuming you have a textbox called txtDept on your form, a textbox called txtID, and a button which requests the next number.

So the button click event procedure would just have..

me.txtID = GetNext(me.txtDept)



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newtt13_newtt13Author Commented:
Ok so I dont know a thing about VB.  What if I do not have a field called txtDept?  
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newtt13_newtt13Author Commented:
Let me clarify that, the dept id field does not exist in my database.  The dept name just gets typed within my control number field that I am trying to auto increment.
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peter57rCommented:
You don't need a Dept field in the table but you DO need a separate textbox on the form where the user enters the dept so that it can be used by the code to find the next number.

If there is a known list of dept codes you should create a table of these and use a combobox instead of a textbox on the form to allow the user to select from the list.  That will ensure consistency and reduce errors.
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newtt13_newtt13Author Commented:
peter57r,
you are a rockstar.  I finally got the event procedure to create a new record and auto input the control number.  However, the new record is coming up as MD-2005-0001.  Any idea why the date is coming up as 2005? Also how can I get that condensed to a 2 digit year?
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peter57rCommented:
Sorry - a typo there...) in the wrong place

prefix = pDept & "-" & Year(Date) - 2000

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Helen FeddemaCommented:
For a 2-digit year string, use Format(Date(), "yy")
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newtt13_newtt13Author Commented:
Works great! Thanks
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