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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">Hi Brent,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">I’ve often found that the problem with views has come from the id column. Does the integer “station_no” column have a unique constraint? It may need
one.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><br>
I put some notes on Spatialite views in this Stack Exchange answer a few years ago.<br>
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<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><a href="https://gis.stackexchange.com/a/301444/64762">https://gis.stackexchange.com/a/301444/64762</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> QGIS-User <qgis-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Brent Wood via QGIS-User<br>
<b>Sent:</b> 05 December 2024 21:53<br>
<b>To:</b> 'Qgis-user@lists.osgeo.org' <qgis-user@lists.osgeo.org><br>
<b>Subject:</b> [Qgis-user] Help opening a Spatialite view in QGIS<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:black">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I have created a view in a spatialite database, but am unable to open it in QGIS.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I can't find any documentation on how this works.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I have a table "stations" which contains a station_no column (integer) and a point geometry column (startp, EPSG 4326).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">The view is created by:<o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black">create view v_stat as select station_no, startp from station;</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I add an entry to the Spatialite views_geometry_columns table to populate the metadata describing the view.<o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black">insert into views_geometry_columns</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black"> (view_name, view_geometry, view_rowid, f_table_name, f_geometry_column, read_only)</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black"> values</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black"> ('v_stat', 'startp', 'station_no', 'station', 'startp', 1)</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">QGIS now lists the view correctly as a table with a geometry & lists startp as the geometry, but when I try to open it, I just get an "invalid layer" error message.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><i><span style="color:black"> dbname='/home/baw/tan2413/tan2413.spdb' table="v_stat" (startp) is an invalid layer - not loaded</span></i><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Can anyone tell me how to set up a Spatialite view so it can be successfully opened in QGIS?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Brent Wood<br>
<br>
Principal Technician, Fisheries<br>
NIWA<br>
DDI: +64 (4) 3860529<o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://www.niwa.co.nz/"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;border:solid windowtext 1.0pt;padding:0cm;text-decoration:none"><img border="0" width="100" height="100" style="width:1.0416in;height:1.0416in" id="Picture_x0020_1" src="cid:~WRD0000.jpg" alt="Image removed by sender."></span></a><span style="font-size:8.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">Brent Wood <br>
<span style="color:#1793D2">Principal Technician - GIS and Spatial Data Management</span><br>
<span style="color:#1793D2">Programme Leader - Environmental Information Delivery</span><br>
+64-4-386-0529<br>
<br>
National Institute of Water & Atmospheric Research Ltd (NIWA)<br>
301 Evans Bay Parade Hataitai Wellington New Zealand<br>
<b>Connect with NIWA:</b> <a href="https://www.niwa.co.nz">niwa.co.nz</a> <a href="https://www.facebook.com/nzniwa">
Facebook</a> <a href="https://www.linkedin.com/company/niwa">LinkedIn</a> <a href="https://twitter.com/niwa_nz">
Twitter</a> <a href="https://www.instagram.com/niwa_science">Instagram</a> <a href="https://www.youtube.com/channel/UCJ-j3MLMg1H59Ak2UaNLL3A">
YouTube</a> <o:p></o:p></p>
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