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<p class="MsoNormal"><b>From:</b> Qgis-user <qgis-user-bounces@lists.osgeo.org> <b>
On Behalf Of </b>Andrea Giudiceandrea<br>
<b>Sent:</b> Wednesday, January 19, 2022 3:00 PM<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> [Qgis-user] Virtual Layer query with "currentExtent" not working anymore<o:p></o:p></p>
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<p class="darkgray"><span class="sender"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#666666"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=from:%22Bernd+Vogelgesang%22"><span style="color:#666666;text-decoration:none">Bernd
Vogelgesan</span><span style="color:#666666;text-decoration:none">g</span></a></span></span><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#666666"> <span class="date"><a href="https://www.mail-archive.com/search?l=qgis-user@lists.osgeo.org&q=date:20220119"><span style="color:#666666;text-decoration:none">Wed,
19 Jan 2022 03:34:05 -0800</span></a></span><o:p></o:p></span></p>
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<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier;color:black">A while ago, I figured out how to limit a query on a layer by the</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier;color:black">current map extent as a preparation for another query:</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
<pre style="background:white;white-space:pre-wrap;overflow-wrap: break-word"><span style="font-size:10.5pt;font-family:Courier;color:black">SELECT * FROM ASK_Geometrien WHERE</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier;color:black">st_intersects(ASK_Geometrien.geometry, currentExtent());</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier"><o:p> </o:p></span></pre>
<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier;color:black">Now, when I try it again later, the test fails with "no such function:</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
<pre style="background:white"><span style="font-size:10.5pt;font-family:Courier;color:black">currentExtent"</span><span style="font-size:10.5pt;font-family:Courier"><o:p></o:p></span></pre>
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<p class="MsoNormal"><br>
Hi Bernd,<br>
AFAIK there is no currentExtent() inbuilt function.<br>
<br>
You need to define a custom currentExtent() function that returns the current extent.<br>
<br>
Please see, for example: <a href="https://gis.stackexchange.com/questions/303325/how-to-speed-up-a-query-in-a-virtual-layer-of-qgis">
https://gis.stackexchange.com/questions/303325/how-to-speed-up-a-query-in-a-virtual-layer-of-qgis</a><br>
<br>
Best regards.<br>
<br>
Andrea Giudiceandrea<o:p></o:p></p>
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