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Filtering Question
Message
From
04/10/2001 09:09:18
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivia
 
 
To
04/10/2001 08:40:37
Jimi Lee
Pop Electronic Products Ltd.
Hong Kong, Hong Kong
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
00564048
Message ID:
00564084
Views:
22
You already said what was the disadvantage: it is slow. This seems to be some sort of bug with VFP: Rushmore Optimization doesn't seem to be used with grids/filters.

The correct thing to do is to use a view. A view is like a query, but updatable (changes made to the cursor can be written back to the original tables).

Hilmar.

>Thanks Cetin,
>
>Just wanna know more, what is the disadvantage of using grid with filters?
>
>Thanks,
>Jimi
>
>
>>>hi,
>>>
>>>Showing data with a grid and set filters to view the wanted records is a very common thing.. i think most people should have tried it..
>>>
>>>I also have a form to do such thing, but for one of the filter settings, the grid would become VERY slow, each click on the grid takes 3-5 seconds to get focus, but it works just fine with other filters..
>>>
>>>would anyone please have a look and see if the following filter would make the grid act so strangely slow?
>>>
>>>select MyTable
>>>
>>>filter_expr=allt(thisform.myTextbox.value)  && see what the user want to see
>>>filter_desc=iif(UsingFirstLang(), "name1", "name2")  && check different field when using different language setting
>>>set filter to at(filter_expr, &filter_desc)>0
>>>
>>>thisform.grdIT03Itemlist.refresh()
>>>
>>>
>>>any idea? Please help~
>>>Jimi
>>
>>Jimmy,
>>Filters and grids are not common :) Whenever possible do not use (personal opinion).
>>Instead try making Recordsource directly an SQL (needs index on name1 and name2). Then all you would do is a grid.refresh or grid.recordsource=grid.recordsource if not indexed (I don't know why but grid goes blank if not indexed).
>>Cetin
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
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