I am trying to create a food order system for a restaurant.
I have tried using both the DSum and Sum functions to calculate the total cost of an order. The total cost is a textbox on the form tblOrder (and a field in tblOrder) and the list of meals along with their costs are in the tblOrderDetail Subform (the columns in this form come fromt two tables - tblOrderDetails and tblItems).
I have been putting the DSum / Sum in the control soure property. With the expression builder I have tried:
DSum ( [tblOrderDetail Subform].Form![Cost] , [tblOrderDetail Subform].Form )
result: #error
=DSum([Cost],[tblOrder]) result: #name?
=DSum("Cost","t blOrder") result: #error
=DSum("[Cost]","[tblOrder]") result: #error
Sometimes I get #name? error, which i can solve by using a more lengthy description (not sure that's the right word) though all the internet examples only use one word in quotation marks, or i get #error which i can't solve at all.
I haven't specified a criteria as I wanted it to calculate the cost for all the items in that order
Both the table and the form are called tblOrder becasue I didnt change the name Access chose in the form wizzard
I am using Access 2000
Feb 6 '07
33  8245  NeoPa 32,577
Recognized Expert Moderator MVP
Instructions for creating the QueryDef (qryOrder). - From the main Database window select Insert / Query.
- Click OK on Design View.
- Hit <ESC> to avoid adding a table.
- Select View / SQL View.
- Paste in the SQL posted earlier (Copied below).
- Select View / Design View.
- Close and, when prompted, select Yes to Save.
- Enter "qryOrder" (no quotes) as the name.
- SELECT tblOrder.OrderID,tblOrder.TableID,
-
tblOrderDetails.ItemID,tblItem.Cost
-
FROM (tblOrder INNER JOIN tblOrderDetails
-
ON tblOrder.OrderID=tblOrderDetails.OrderID)
-
INNER JOIN tblItem
-
ON tblOrderDetails.ItemID=tblItem.ItemID
In reply to #7 and #8 and judging by 11# the SQL for the query is in the right place and the total cost textbox in the order form will give you the correct total if you close and re-open the form, just not immidiatly. Somehow I must have put the SQL in as code as well, which I have now deleted, and it works fine, thank you so much!!
Along a similar line I know I need to put .refresh somewhere so that the form always shows the most current total cost but I'm not sure what to attach it to and what code to put in front of it? Thanks again
NeoPa 32,577
Recognized Expert Moderator MVP
You will need a .Requery rather than a .Refresh.
I will try to have a look at this again to see where.
NeoPa 32,577
Recognized Expert Moderator MVP
Right, to know where to put the .Requery, we need to consider what is changing the data that this is worked out from. - =DSum("[Cost]","qryOrder","OrderID=" & txtOrderID)
The code to do it would be : - Call Me.[Total Cost].Requery
It needs to be set up to trigger after any changes are made to the underlying data that effect the result.
Is that VB code that I should put on something like an after update event in the ItemID field of the subform? I'm just getting error messages or nothing at the moment and could do with a pointer?
NeoPa 32,577
Recognized Expert Moderator MVP
That's about right I think.
It does depend on which controls cause the result to change. You would need to add it to all of their AfterUpdate event procedures.
I've tried that but I can't get it to work, guess that's a bit more complex than I can manage at the moment, I'll just leave it to an update button I think, thanks so much for all your help :)
NeoPa 32,577
Recognized Expert Moderator MVP
That's alright.
Have you tried setting it on one control that you know causes the requery to be required, then testing it by changing the value in that control?
A step-by-step approach often works well in debugging.
I recon the control would be the ItemID because an addition of an Item is what requires the TotalCost to be recalculated. Thanks for the pointer.
However I keep getting a error saying "can't find the field "I" ' and the option to debug the line - Call Me.[Total Cost].Requery
The VB code doesn't have an "I" in it so i don't know what to debug.
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