[Qgis-user] Help opening a Spatialite view in QGIS

[John Stevenson - BGS]

Hi Brent,

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.

I put some notes on Spatialite views in this Stack Exchange answer a few years ago.

https://gis.stackexchange.com/a/301444/64762

John

From: QGIS-User <qgis-user-bounces at lists.osgeo.org> On Behalf Of Brent Wood via QGIS-User
Sent: 05 December 2024 21:53
To: 'Qgis-user at lists.osgeo.org' <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Help opening a Spatialite view in QGIS

Hi,

I have created a view in a spatialite database, but am unable to open it in QGIS.

I can't find any documentation on how this works.

I have a table "stations" which contains a station_no column (integer) and a point geometry column (startp, EPSG 4326).

The view is created by:
create view v_stat as select station_no, startp from station;


I add an entry to the Spatialite views_geometry_columns table to populate the metadata describing the view.
insert into views_geometry_columns
        (view_name, view_geometry, view_rowid, f_table_name, f_geometry_column, read_only)
      values
        ('v_stat', 'startp', 'station_no', 'station', 'startp', 1)

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.

 dbname='/home/baw/tan2413/tan2413.spdb' table="v_stat" (startp) is an invalid layer - not loaded


Can anyone tell me how to set up a Spatialite view so it can be successfully opened in QGIS?


Thanks

Brent Wood

Principal Technician, Fisheries
NIWA
DDI:  +64 (4) 3860529
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Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
+64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
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