[Mapserver-users] Perl Mapscript queryByRect

[Dane Haygood]

>
> Have you tried turning the layer on explicitly before the query.
>
> $parcelLayer->{status} = $mapscript::MS_ON;
>
> If that doesn't work try a LAYER TYPE of POLYGON vs. QUERY.
>

I tried both of these suggestions and neither seemed to work.


>
> Also you could try queryByPoint() with a large tolerance to accomplish a
rect query.
>

Maybe I will try that tomorrow - but I would love to figure out what the
deal is with queryByRect.

Dane

----- Original Message ----- 
From: "Eric Bridger" <eric at gomoos.org>
To: "Dane Haygood" <dane_haygood at bellsouth.net>; "Mapserver Mailing List"
<mapserver-users at lists.gis.umn.edu>
Sent: Friday, July 30, 2004 11:04 PM
Subject: Re: [Mapserver-users] Perl Mapscript queryByRect


> At 04:17 PM 07/30/2004 -0500, Dane Haygood wrote:
>
> >I am attempting to use the queryByRect function of mapscript - but it
seems I am doing something wrong.
> >I read somewhere that the query only occurs on Layers where TEMPLATE is
defined in the mapfile.
> >If I include a TEMPLATE definition in the layer I want to query - I get
"no items found for query"
> >which indicates that my call to queryByRect returned MS_FAILURE.
> >
> >I have tried playing with the STATUS, TEMPLATE, and TYPE definitions in
the layer of the mapfile.
> >I get the same results regardless if the file specified by the value for
TEMPLATE actually exists or not.
> >
> >
> >
> >I have included snippets from both the perl script and from the mapfile
below.
> >I have manually set the rectangle extents but figured this code should
return all the items in the layer.
> >
> >Thanks for any help...
> >
>
>###########################################################################
#########
> ># PERL SCRIPT
>
>###########################################################################
#########
> >
> >$map =  new mapscript::mapObj($map_path.$map_file);
> >$rectangle = $map->{extent};
> >
> >my $parcelLayer = $map->getLayerByName('hydro_query');
> >my $status = $parcelLayer->queryByRect($map, $rectangle);
> >if ($status == MS_FAILURE) {
> >        print("no items found for query\n");
> >        exit;
> >}
> >
> >my $numResults = $parcelLayer->getNumResults();
> >print("query returned $numResults results\n");
> >
> >my $result = $parcelLayer->getResult(0);
> >print("RESULTS: $result\n");
>
> Have you tried turning the layer on explicitly before the query.
>
> $parcelLayer->{status} = $mapscript::MS_ON;
>
> If that doesn't work try a LAYER TYPE of POLYGON vs. QUERY.
>
> Also you could try queryByPoint() with a large tolerance to accomplish a
rect query.
>
> HTH.
> Eric
>
>