Is there an easy way to increase certain fields in tables working as a counter from a third table in a master/detail form? For example:
Order Table Item Table Counter Table Order ID Order ID Count
I don’t know if you’d necessarily call it easy, but to set a counter field, I’ve found it best to use the AfterInsert method on the Master table of the relationship, so the counter gets carried down to any detail tables. For instance, let’s say you have a Counter table called Counter with a field called CountVal, that stores your current counter. I’d do something like this:
function TMainForm.GetNewCountVal : Integer;begin with Counter do begin Edit; FieldByName('CountVal').AsInteger := FieldByName('CountVal').AsInteger + 1; Post; Result := FieldByName('CountVal').AsInteger; end;end;procedure TMainForm.Table1AfterInsert(DataSet: TDataSet);begin with Table1 do begin if (State <> dsEdit) then Edit; FieldByName('Order Id').AsInteger := GetNewCountVal; end;end;
That should do the trick.