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looping through recordsets for calculated fields

12 New Member
Hi ,

I need help to solve this problem

Problem definition:

I have a table 'tblItemOrdQty' with item name and its order quantities (Lot1,Lot2,Lot3 .... etc). Each items are ordered in different lots. Some are ordered as single lot.. some in two lots.. some in three lots etc.
My objective is to have a new column ( a calculated field) with the value of latest order quantity for each item.

Eg.

Item ID | Item Name | Lot1 | Lot2 | Lot3| Latest Qty (calc.field)

1 | Item1 | 10 | 11 | 14 |14
2 | Item2 | 5 | 4 | null | 4
3 | Item3 |20 | null | null |20


I have made a query 'ItemOrdQuery'w ith Item ID, Item name, Lot 1 , Lot 2, Lot 3. I need to know how to build expression for the Latest Qty calculated field for my desired objective.

Is there any way it can be done using SQL or VBA program using recordsets?

Waiting for your reply.

Thank you for your time.
Oct 22 '12
26 6819
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
CSV:Comma Seperated File. Access can export a table as such, and Excel can save as a CSV file as well.
It is similar to a text file.

The main reason for preferring a CSV is that (as far as I know) a CSV cannot contain virus/macros, whereas an excel file can.
Oct 22 '12 #11
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
I would still recommend if this information is something you need to use at a later point in time, that you spend time on normalizing the data.

If this is just something you need to process, create a report or similar, and then toss the original data, then its ok to use non-normalized data.

Is the table "tblItemOrd Qty" overwritten each time you import data, or do you append to the table?
Oct 22 '12 #12
twinnyfo
3,653 Recognized Expert Moderator Specialist
I agree with Smiley and normalizing. If you get the data in an excel format, it should be pretty easy to import that data into a normalized state.
Oct 22 '12 #13
enigma19
12 New Member
The table is overwritten each time.

I am using Excel 2007. I am not having CSV option when i do save as. I am attaching the excel file
Attached Files
File Type: xlsx Piping_Engg All Rev.xlsx (10.6 KB, 412 views)
Oct 22 '12 #14
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
I will look at writing a piece of code for it.

In the meantime, if you are not familiar with normalization, I suggest you read the link I provided in post #2.
It is quite good.
Oct 22 '12 #15
enigma19
12 New Member
Ok. I will definitely read it.

SmileyCoder.. Thanks a lot. You are very helpful :-)
Oct 22 '12 #16
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
I imported the excel sheet into a mdb, and named the table the same as you indicated in your original post.

I added an extra field to the table RLastQty and then used the following code to calculate the field:
Expand|Select|Wrap|Line Numbers
  1. Private Sub CalculateLast()
  2.    Dim i As Integer
  3.    Dim varFieldValue As Variant
  4.    Dim strFieldName As String
  5.  
  6.    'Open Recordset
  7.       Dim rs As DAO.Recordset
  8.       Set rs = CurrentDb.OpenRecordset("tblItemOrdQty", dbOpenDynaset)
  9.       If rs.EOF Then GoTo exitSub
  10.  
  11.    'Loop through records
  12.       Do While Not rs.EOF
  13.          'Reset storage
  14.             varFieldValue = Null
  15.  
  16.          'Loop through fields in reverse
  17.             For i = 10 To 0 Step -1
  18.                strFieldName = "r" & Format(i, "00") & " Qty"
  19.                If Not IsNull(rs(strFieldName)) Then
  20.                   varFieldValue = rs(strFieldName)
  21.                   'Found a value, so exit loop
  22.                   Exit For
  23.                End If
  24.             Next
  25.  
  26.          'Write calculated value to field
  27.             rs.Edit
  28.                rs("RLastQty") = varFieldValue
  29.             rs.Update
  30.  
  31.          'Move to next record
  32.          rs.MoveNext
  33.       Loop
  34.  
  35.  
  36. exitSub:
  37.    'Cleanup objects
  38.    rs.Close
  39.    Set rs = Nothing
  40.  
  41.  
  42.  
  43. End Sub
I have included the database sample here.

This calculates it and stores it in the table itself. Again not a normalized approach but since the table itself is not normalized I don't see the harm.
Attached Files
File Type: zip Lots.zip (25.9 KB, 148 views)
Oct 22 '12 #17
enigma19
12 New Member
TheSmileyCoder,

My Access Guru....Brillia nt!!!
This is exactly what i wanted.

I have one more question. Can i have the same result in a query? In your example you had designed a form with calculate cmd button. I would like to have it as a query with a calculated field, so that i can use this field in another query to calculate the difference between Quantity required and Quantity ordered. That would help me to reach the final objective.

Thanks :-)

Suggest me some good learning materials for this level of Access VB Programming. I am really interested.
Oct 22 '12 #18
TheSmileyCoder
2,322 Recognized Expert Moderator Top Contributor
Yes, that is possible as well. I will look into it this evening (if time permits)
Oct 22 '12 #19
Rabbit
12,516 Recognized Expert Moderator MVP
This is a function I use to replicate the functionality of coalesce in SQL Server.
Expand|Select|Wrap|Line Numbers
  1. Public Function coalesce(ParamArray inputs() As Variant) As Variant
  2.     Dim item As Variant
  3.     coalesce = Null
  4.     For Each item In inputs
  5.         If Not IsNull(item) Then
  6.             coalesce = item
  7.             Exit Function
  8.         End If
  9.     Next
  10. End Function
It returns the first non-null parameter passed into the function.
Oct 22 '12 #20

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