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Controls w/ DLookup ControlSource endlessly recalculating in Windows 8 (Access 2003).

Posted on 2013-01-10
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Last Modified: 2013-01-15
I know that Access 2003 is not supposed to work with Windows 8 but I have found it does just fine with this one exception.

If I have a TextBox control with "=DLookup..." as its ControlSource, it just keeps recalculating endlessly when I open the form.  This never happened in Windows 7.

Any ideas on what is happening here?  The form where it does this is a continuous form so there are multiple instances of the control.  As it recalculates the control appears to flash.

Thanks in advance.
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Question by:MitchellVII
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by:MacroShadow
MacroShadow earned 500 total points
ID: 38765068
I don't use Windows 8 nor do I use Access 2003, but you may want to try using Allen Browne's ELookup instead.
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by:MitchellVII
ID: 38765143
Thank you. I have tried ELookup and still get the same odd behavior.
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by:MacroShadow
ID: 38765169
Sorry, I haven't got a clue to what the issue is.
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by:Dale Fye (Access MVP)
ID: 38765192
Can you post the entire text of the DLookup( ) domain call?

What is the name of the control for which this is the source.

Why do you say Access is not supposed to work in Windows 8, I've not heard that.  Although I'm sure there will be issues with the 64 bit version of Office.
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by:Dale Fye (Access MVP)
ID: 38765202
I rarely use DLOOKUP() as a control source. Generally I'll use the Form_Current event to populate the control and then if that control value is dependent on another control, I'll use the afterUpdate event of the other control to populate the value of the control that you are using the DLOOKUP for.
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MitchellVII earned 0 total points
ID: 38765249
Hmmm, I think I have found the problem and a solution.

It seems that Windows 8 does not like DLookup (or ELookup) as a ControlSource but doesn't mind it at all in the underlying query.  Weird.

** MS is weird.  They say that Office 2003 will not work properly with Windows 8, but the individual components will.
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by:mbizup
ID: 38766483
<<
It seems that Windows 8 does not like DLookup (or ELookup) as a ControlSource but doesn't mind it at all in the underlying query.  Weird.
>>

Just a word of caution... if you are indeed resolving this by placing your DLookup in the query behind your form, you very may well find that speed/performance is shot.

There are other ways to work around this that won't kill performance like DLookup in a query will... for example using a combo box to lookup the values needed, or maybe a custom function called from the control source.
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LVL 57
ID: 38767685
Just to add to what Miriam said, use of a Dlookup() (or any of the domain functions) in a query is not a good idea because the query parser cannot optimize the statement.  Poor performance will almost always be the result (you can get away with it on small recordsets).

All of the domain functions represent a SQL statement anyway, which you can write directly in a query, so there is no reason to use them there.  Either do a join, write a sub-select, or use another query as a "table" in this one.

 The  Domain functions were only meant to be used in places where SQL statements are not (like a control expression).   As the others have pointed out, there are other ways to get around the problem you were having besides moving it into the query.

HTH,
Jim.
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Author Closing Comment

by:MitchellVII
ID: 38777602
I found my own solution but the ELookup solution was helpful.
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