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11.27.2007 at 10:05PM PST, ID: 22986886
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Delphi 7 :: TADOQuery OnAfterScroll Error with parameters

Tags: delphi, tadoquery, parameter
Dear Experts,

I have 2 TDBGrid components.
The 1st one must display master table records and the second one displays detail table records
for the selected row in the master table.
qOrders = Master Query
qParts = Detail Query.

On qOrders' OnAfterScroll event I have the following code:
**** PS: See code snippet.

When my application starts up I receives and error:
"EDatabaseError with message 'qParts: Parameter 'POrderNumber' not found'...."
This parameter does exist and when I click the error message away the application starts up and
when scrolling through the master dbgrid the code is working 100%. It is only when the app starts up when I receive this error. After that, it is working as expected.

What can possible be wrong?

Please help.
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procedure TPickingListFrame.qOrdersAfterScroll(DataSet: TDataSet);
begin
  inherited;
  If qOrders.IsEmpty then Exit;
 
  qParts.Close;
  qParts.SQL.Clear;
  qParts.SQL.Text := 'SELECT POrderNumber, ItemNumber, ItemDescription, Qty FROM tblCallOff WHERE '+
    '(POrderNumber = :POrderNumber) AND (Deleted = :Deleted) ORDER BY ItemNumber';
  qParts.Parameters.ParamByName('POrderNumber').Value := qOrders.FieldByName('POrderNumber').AsString;
  qParts.Parameters.ParamByName('Deleted').Value := 0;
  qParts.Open;
end;
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Question Stats
Zone: Programming
Question Asked By: Marius0188
Solution Provided By: developmentguru
Participating Experts: 5
Solution Grade: A
Views: 25
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11.27.2007 at 11:08PM PST, ID: 20363690

Rank: Genius

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11.27.2007 at 11:11PM PST, ID: 20363698

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11.28.2007 at 12:08AM PST, ID: 20363862

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11.28.2007 at 12:26AM PST, ID: 20363906

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11.28.2007 at 12:42AM PST, ID: 20363970

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11.28.2007 at 12:52AM PST, ID: 20363998

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11.28.2007 at 12:59AM PST, ID: 20364018

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11.28.2007 at 05:28AM PST, ID: 20365253

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01.09.2008 at 03:10AM PST, ID: 20617039

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01.09.2008 at 04:12AM PST, ID: 20617343

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03.20.2008 at 03:34AM PDT, ID: 21169738

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11.27.2007 at 11:08PM PST, ID: 20363690

Rank: Genius

ensure, that the ParamCheck-property of the TAdoQuery is set to true

meikl ;-)
 
11.27.2007 at 11:11PM PST, ID: 20363698

Rank: Genius

in case that the sql don't change during runtime (except the parameterValues),
you could simple close, set the parameter and open again
(a clear and new set of the sql is not needed then)
(would be also raise the performance)

meikl ;-)
 
11.28.2007 at 12:08AM PST, ID: 20363862
Is your DBConnection and your qOrders/qPart opened at designtime? Close them before you launch you application.
 
11.28.2007 at 12:26AM PST, ID: 20363906

Rank: Guru

are you sure the error from "qOrdersAfterScroll" event
 
11.28.2007 at 12:42AM PST, ID: 20363970

Rank: Guru

Change component creation order of these two components.
(qOrders,qParts)
 
11.28.2007 at 12:52AM PST, ID: 20363998

Rank: Guru

Set Active property of qOrders equal to false. then open this dataset in the "formcreate" event.




procedure TPickingListFrame.FormCreate(Sender: TObject);
begin
   qOrders.Open;
end;
 
11.28.2007 at 12:59AM PST, ID: 20364018
Don't open on TPickingListFrame.FormCreate(Sender: TObject). Open during TPickingListFrame.FormShow(....

This will by-pass creation order issues as well.
 
11.28.2007 at 05:28AM PST, ID: 20365253

Rank: Guru

With my own testing I verified your results.  I also discovered that having an active TADOConnection (referenced by the ADOQuery) corrected the situation.

Let me know if you need more.
Accepted Solution
 
01.09.2008 at 03:10AM PST, ID: 20617039
This question has been classified as abandoned as it has no comments in the last 21 days.  I will make a recommendation to the moderators on its resolution in approximately four days.  I would appreciate any comments by the experts that would help me in making a recommendation.

It is assumed that any participant not responding to this request is no longer interested in its final disposition.

If the asker does not know how to close the question, the options are here:
http://www.experts-exchange.com/help.jsp#hs5

Venabili
EE Cleanup Volunteer
 
01.09.2008 at 04:12AM PST, ID: 20617343

Rank: Genius

as the questioner itself didn't response to any comment which wass done, so that any advice due lack of feedback could be/ could not be right, i would recommend to delete this question

meikl ;-)
 
03.20.2008 at 03:34AM PDT, ID: 21169738

Rank: Sage

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I will leave the following recommendation for this question in the Cleanup topic area:
   Accept: developmentguru {http:#20365253}

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

ciuly
EE Cleanup Volunteer
 
 
03.24.2008 at 03:10PM PDT, ID: 21197650
Forced accept.

Computer101
EE Admin
 
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628