[mapguide-users] RE: selectionXml - 1.time fast..then very slow...ZoomToView

Mon Nov 27 14:07:37 EST 2006

As far as I am aware this is not a performance issue. This is a
releasing memory and connection cleanup type of Close. The feature
reader is like a data stream which you NEED to close when you are
finished with it. This is a little different from other classes that
have a Close method.

Dave 

-----Original Message-----
From: Tom Chadwin [mailto:tom.chadwin at nnpa.org.uk] 
Sent: Monday, November 27, 2006 4:46 AM
To: users at mapguide.osgeo.org
Subject: [mapguide-users] RE: selectionXml - 1.time fast..then very
slow...ZoomToView

Do any other objects require closing to improve performance, such as
maps?

Thanks

Tom

Dave Wilson-3 wrote:
> 
> The most common problem we have seen that exhibits such behaviour is 
> using a FeatureReader and not closing it after finishing with it. In 
> this case after the line of code:
> 
> $selection->AddFeatures($layer, $featureReader, 0);
> 
> You might try a $featureReader->Close();
> 
> This of course assumes the reader is no longer needed.
> 
> Dave
> 
> -----Original Message-----
> From: Farah [mailto:farah at egovernments.org]
> Sent: Friday, November 24, 2006 1:53 AM
> To: users at mapguide.osgeo.org
> Subject: RE: [mapguide-users] selectionXml - 1.time fast..then very 
> slow...ZoomToView
> 
> Hi...
> 
> I am having a similar problem.
> 1.I do a query on a temporary layer and select a feature in it, 
> programmatically and then zoom to it with the help of setSelectionXml.
> This works fine.
> 
> 2. I then clear the selection before performing a new query on the 
> temporary source and then try to do the same as step 1.
> 
> 3. However, the application hangs when I try to update the temporary 
> feature source with the new features.
> 
> 4. This doesn't happen if I don't do SetSelectionXml. So I am guessing

> that by selecting a feature in the temporary layer, the feature source

> is some how getting locked. So the next time I try to update it, it 
> hangs.
> 
> 5. I tried to delete the feature source and layer every time I perform

> a new search and create it again. However, when I try to delete the 
> feature source, it throws a file IO Exception. This error does not 
> happen if no selection had been made previously!
> 
> Any one has any pointers? :-)
> 
> farah
> 
> 
> -----Original Message-----
> From: Maciej Skorczewski [mailto:maciej.skorczewski at procad.pl]
> Sent: Friday, November 24, 2006 1:40 PM
> To: users at mapguide.osgeo.org
> Subject: [mapguide-users] selectionXml - 1.time fast..then very 
> slow...ZoomToView
> 
> hello all!
> 
> i use (in php) this code to make xml of selected object...it works 
> creat when i use it first time(it is very fast)...then when i clik 
> another search results(streets and home)- so i use this script one 
> more time - my browser (FF and IE) stop working on 10-20 sec. user 
> can't make any action... why it is so? hove can i reload selectionXml
(it is xml file )
>   any sucestion?
> 
> 
> what is faster? use pomQuery and selectionXml
> 
> or
> 
> ZoomToView(x, y, scale, refresh) ?
> 
> 
> 
> 
> 
> <?
> $pomQuery->SetFilter("NRBUDP_ID = '$nrbudp_id' and 
> NUMER_DOMU='$numer_domu'");
> 
> $pomResId = new
> MgResourceIdentifier("Library://mymap/Data/Nrbudp.FeatureSource");
> 	
> $featureReader = $featureService->SelectFeatures($pomResId,
> "SDF_2_Schema:Nrbudp", $pomQuery);
> 
> 
> $layer = $map->GetLayers()->GetItem('Nrbudp');
> $selection = new MgSelection($map);
> $selection->AddFeatures($layer, $featureReader, 0); $selectionXml = 
> $selection->ToXml(); echo "<script type='text/javascript'>\n function 
> OnPageLoad() {\n"; echo "selectionXml = '$selectionXml';\n 
> parent.SetSelectionXML(selectionXml);\n";
> echo "}\n</script>";
> ?>
> then
> 
> i call in <body onload="OnPageLoad()">
> --
> Maciej Skorczewski
> 
> 
> 
> 
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