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Hi John,</div>
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Thanks for getting back to me.</div>
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The following commands are used to create the view (from a bash script), they include creating the unique index on station_no. QGIS is still unable to load the layer, despite listing it as a spatial table in the database.</div>
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I have not tried using the station_no column as a primary key, which may make a difference, though it shouldn't.</div>
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<i>DB=tan2413.spdb</i></div>
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<i># create unique constraint on station_no</i></div>
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<i>echo "drop index uniq_stn;" | spatialite $DB</i></div>
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<i>echo "create unique index uniq_stn on station(station_no);" | spatialite $DB</i></div>
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<i># remove existing view & metadata before creating</i></div>
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<i>echo "drop view v_stat;" | spatialite $DB</i></div>
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<i>echo "delete from views_geometry_columns where view_name = 'v_stat';" | spatialite $DB</i></div>
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<i># create view and register</i></div>
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<i>echo "create view v_stat as select station_no, startp from station;" | spatialite $DB</i></div>
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<i>echo "insert into views_geometry_columns</i></div>
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<i> (view_name, view_geometry, view_rowid, f_table_name, f_geometry_column, read_only)</i></div>
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<i> values</i></div>
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<i> ('v_stat', 'startp', 'station_no', 'station', 'startp', 1);" | spatialite $DB</i></div>
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So I still can't add a view in QGIS.</div>
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Brent Wood<br>
<br>
Principal Technician, Fisheries<br>
NIWA<br>
DDI: +64 (4) 3860529</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> John Stevenson - BGS <jostev@bgs.ac.uk><br>
<b>Sent:</b> Saturday, December 7, 2024 06:51<br>
<b>To:</b> Brent Wood <Brent.Wood@niwa.co.nz>; 'Qgis-user@lists.osgeo.org' <qgis-user@lists.osgeo.org><br>
<b>Subject:</b> RE: Help opening a Spatialite view in QGIS</font>
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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif">Hi Brent,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif">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.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif"><br>
I put some notes on Spatialite views in this Stack Exchange answer a few years ago.<br>
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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif"><a href="https://gis.stackexchange.com/a/301444/64762" originalsrc="https://gis.stackexchange.com/a/301444/64762" shash="AWuS1WY1zr4DNoHQcBOwLrzPLuz5vGAS2y/DTnTQSRe/RETTZjmaAHgu+zgZhmtRAIK2HGbCPHlOyD0K8CikN957NwB+I2iLBG7YgdLo59SL9zMMFNtymXLjtlR8jOzDjJKAxsmaRutRJVmj8KWNpAURBpU/eHWL1GuRHR4cfUs=">https://gis.stackexchange.com/a/301444/64762</a></span></p>
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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Arial",sans-serif">John</span></p>
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<p class="x_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</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hi,</span></p>
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<p class="x_MsoNormal"><span style="color:black">I have created a view in a spatialite database, but am unable to open it in QGIS.</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">I can't find any documentation on how this works.</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_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).</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">The view is created by:</span></p>
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<p class="x_MsoNormal"><i><span style="color:black">create view v_stat as select station_no, startp from station;</span></i><span style="color:black"></span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">I add an entry to the Spatialite views_geometry_columns table to populate the metadata describing the view.</span></p>
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<p class="x_MsoNormal"><i><span style="color:black">insert into views_geometry_columns</span></i><span style="color:black"></span></p>
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<p class="x_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"></span></p>
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<p class="x_MsoNormal"><i><span style="color:black"> values</span></i><span style="color:black"></span></p>
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<p class="x_MsoNormal"><i><span style="color:black"> ('v_stat', 'startp', 'station_no', 'station', 'startp', 1)</span></i><span style="color:black"></span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_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.</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_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"></span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">Can anyone tell me how to set up a Spatialite view so it can be successfully opened in QGIS?</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">Thanks</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif">Brent Wood<br>
<br>
Principal Technician, Fisheries<br>
NIWA<br>
DDI: +64 (4) 3860529</span></p>
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<p class="x_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>
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