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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>After working with this a little more, I
found another symptom- Queries on the layer work just fine when the
application is loaded or refreshed. But when I attempt a subsequent query
on the layer, I get 0 results. That suggests to me that the query, or
layer, somehow needs to be cleared. Does anyone know how this can be
done? I don’t see something like a clearquery method.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Bistrais, Bob <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, February 18, 2011
10:39 AM<br>
<b><span style='font-weight:bold'>To:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> [mapserver-users]
QueryByAttribute sometimes not working</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m having a strange problem with a queryByAttributes
operation in a MapServer application. Most of the time it works correctly,
but sometimes it returns 0 results. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It is querying a shapefile, if that gives a clue.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>My first suspicion was the data wasn’t matching the
query expression. But I checked and it appears to be correct. To
add to the confusion, the application will sometimes select the queried
feature, but not always. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Here is the query expression:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>$query = "( ('[GEOCODE]' ==
'".$_SESSION['geocode']."') && ('[PLAN]' ==
'".$_SESSION['plan']."') && ('[LOT]' ==
'".$_SESSION['lot']."') )";<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>And here is the execution of the query:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>$oLayer _parcels->queryByAttributes("GEOCODE",
$query, MS_SINGLE);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I echoed back the query statement, and it looks correct.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This one is pretty confusing. Has anyone seen anything
like this?<o:p></o:p></span></font></p>
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