[Mapserver-users] question re Perl queryByShape

[Lowell Filak]

Please see below.

The following message was sent by Puneet Kishor
<pkishor at geoanalytics.com> on Mon, 22 Sep 2003 08:59:52 -0500.

> as I understand, here's the logic for querying by shape --
> 
> 1. create a shape to query with (queryShpObj)
> 
> 	my $queryShpObj = new blah blah;
> 
> 2. call queryByShape on the map object (mapObj) using the above shape
> 
> 	$mapObj->queryByShape($queryShpObj);
> 
> Now, herein lies my question -- how does mapobject know which layer to 
> query against? The intuitive model that I have learned (the Pavlovian 
> Arcview way) is that you have first choose a layer before you can query 
> against it. Even if we extend that model, we can make it plural... 
> choose the layer or layers against which to query. So the syntax should 
> be somewhat like
> 	my $queryLayerObj = new blah blah (proabably with a getLayerByName);
> 	$mapObj->queryByShape($queryShpObj, $queryLayerObj);

Isn't that what $layer->queryByShape is for?
Lowell

> 
> Once that is done then one could(should) work with the $resultCacheObj
> 
> 	my $resultCacheObj = $queryLayerObj->{resultcache};
> 
> Not specifying the queryLayer(s) in step 2 above -- doesn't that make 
> things slower?
> 
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