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MS Access  last number used +1

Posted on 2009-06-27
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Last Modified: 2013-11-28
When creating a record I need to assign a unique number. I do not want to use the auto number. I would like to use the last number +1. This is a multi user database and I can't have duplicate numbers. The front end is MS Access and back end in MS SQL. How would I do this?
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Question by:seanlhall
7 Comments
 
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Expert Comment

by:Anthony Perkins
Comment Utility
Since you like to live dangerously do it this way:

BEGIN TRANSACTION

INSERT YourTable (UniqueNumber, Col1, Col2, ...)
SELECT MAX(UniqueNumber) + 1, 'Value1', 'Value2', ...
FROM    YourTable

COMMIT
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Accepted Solution

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thenelson earned 500 total points
Comment Utility
DMax("YourField", "YourTable") + 1
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LVL 38

Expert Comment

by:Jim P.
Comment Utility
Do you want a date serialized number. Who is keying it in? The acct exec id. A composite off the customer.

There are many ways of doing this.
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Author Comment

by:seanlhall
Comment Utility
The starting number will be keyed in by me starting at 100. The number will be use for the case number. Example Year-100 and 09-101... I have been using the ID number of the table but if a record is deleted I lose that number.
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LVL 38

Expert Comment

by:Jim P.
Comment Utility
The problem, as I see it, is trying to keep everything in a series. The total insistence on keeping everything in series (1,2,3,4,5) without having missing numbers (1,2,3,5...) is just overwrought. It doesn't buy you anything.

In addition, are you sure you will have less than 899 cases a year? Your range is 09-100 to 09-999. What happens then.

I'm bringing up the design points now.
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Author Comment

by:seanlhall
Comment Utility
I agree that each number in series 1,2,3,4 is most likely not going to happen. The range will start at 100 and continue from there. There is not ending number. At the begin of the new year the number will return to 100.  Example 10-100.
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LVL 38

Expert Comment

by:Jim P.
Comment Utility
This function should be able to do what you want.
Public Function GetIDNum()
 

Dim DB As Database

Dim RS As Recordset

Dim SQL As String
 
 

'This is based on having a table "IdxNbrTbl" with the _

 columns "Id_Num" as a number field and "Year_Val" as _

 string/text field.
 

SQL = "SELECT Id_Num, Year_Val " & _

    "FROM IdxNbrTbl"
 

'Determine Current FY
 

Set DB = CurrentDb()

Set RS = DB.OpenRecordset(SQL)
 

With RS

    .MoveFirst

    'This will reset the value if the ID_Num (Record number) _

     back to 100 if its a new Year.

    If !FY_Val <> Year(Now()) Then

       .Edit

       !ID_Num = 100

       !FY_Val = Year(Now())

       .Update

    End If

    'If the Year hasn't changed, then this just gets the new _

     ID_Num and passes it back.

    GetIDNum = Right(!FY_Val, 2) & "-" & Format(!Idx_num, "000")

    .Edit

    !ID_Num = !ID_Num + 1

    .Update

End With
 

Set RS = Nothing

Set DB = Nothing
 

End Function

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