Need help with a component trying to use Lookup

Posted on 2006-07-12
Last Modified: 2010-04-05

I'm using Absolute DB ( with a table that is setup in the following way:

BLink | OLink | Option                       | PBCode|
201   | 1001  | 'Integral Dust Drawer' | 'IDD'    |

So, this is a price book table, with BLink(book link), OLink(option link) and a PBCode which is a string value, and option text.  

I have a combo box component that I'm trying to automatically fill with option text based on an array that is passed to it.  Here's the code that I build the combo box with:

  modelArray: Array [0..2] of String;

    modelArray[0] := 'GSMBASE';
    modelArray[1] := 'HOPPER';
    modelArray[2] := 'IDD';

    //_Configuration is the combo box I'm trying to build....

//Here's the code for the combo box.  It has properties of BLink and OLink, which are integer values.  So in this case the BLink is set to 201:

Function TPBxComboBox.LoadItemsFromCodes(codeArray: Array Of String): Integer;
    i,daOLink: Integer;
     SearchList, SearchList2: Variant;
    Result := -1; // error code for NIL value for datasets
    ErrMsg := 'Nil Datasets';
    If Not Assigned(dsOptions) Then
    If Not Assigned(PItem) Then

    xOLinkTrack := False;

    For i := 0 To High(codeArray) Do
        With dsOptions As TABSTable Do
            If State = dsInactive Then

            xOLinkList.Clear; //this is a string list that contains an olink for each item in the combo box

            //lookup the OLink for the PBCode that was passed via the codeArray[] array:
            daOLink := dsOptions.Lookup('BLink;PBCode', VarArrayOf([BLink,codeArray[i]]), 'OLink');

            //use the Olink we just found to lookup the Option text for placing in the combo box
            Items.Add(dsOptions.Lookup('BLink;OLink', VarArrayOf([BLink, daOLink]), 'Option'));

            Self.ItemIndex := 0;
            Result := Items.Count;

            //other various code....
            If Items.Count > 0 Then
                xOLinkTrack := True;
                ziHold      := ihOptions;

As you can see, this should find an olink for the each of the values that I pass to the LoadItemsFromCodes function, then use that olink to find the option text and load that text into the combo box.  However, it only puts the 'IDD' or Integral Dust Drawer option in.  The two other array values are simply not present in the combo box, even though they are present in the dsOptions table and should be in the combo box.  I cannot figure out why.  This is my first time using the Lookup method, so I may be missing something easy here.

Question by:light_bulb

Author Comment

ID: 17091334
Oh shoot, I found the problem.  I should have put the following lines before the loop instead of inside it:


I was clearing the lists every time through the loop.  Oh well, not the first time I've made that mistake.
LVL 17

Accepted Solution

Wim ten Brink earned 500 total points
ID: 17106729
Damn! I was about to say that too. :-)

You might want to put the line "If State = dsInactive Then Open;" also a bit higher, outside the loop. No need to check if it's inactive for every item in the array, is it? This will probably speed up your code with about 5 clock cycles, which on a 1 GHz computer will save you... Well, it's not much, I know...

Go ask for a refund and have this question deleted before someone else sees your mistake... ;-)


Featured Post

Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question