[Mapserver-users] question re Perl queryByShape

[Eric Bridger]

The functionality you want already exists.

Both the map and layer objects have queryByShape() methods.  So
$mapObj->queryByShape() will query all layers which are ON.
$layerObj->queryByShape() queries only that layer.



On Mon, 2003-09-22 at 13:59, Puneet Kishor wrote:
> 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);
> 
> 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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