Thanks Nyall, will try this today!
Raymond
On 05-12-2022 00:53, Nyall Dawson wrote:
On Fri, 2 Dec 2022 at 23:05, Richard Duivenvoorde via QGIS-Developer
<qgis-developer@lists.osgeo.org> wrote:
Ok, I think I found the crux!
With your code QGIS 3.26 will CREATE a new geopackage... (if it is not there
yet)
After which QGIS master is fine
BUT QGIS master apparently does NOT create a new geopackage with your code...
So IF there is an excisting test.gpkg, all is fine
IF there is not one, it depends on you QGIS version if it creates a fresh one
or not?
Maybe some core dev can say something about this?
I'd say the old behaviour was an unintentional bug, and that
createConnection should only be used with a path that already exists.
For 3.28 and later you can create empty databases using
QgsProviderMetadata.createDatabase(uri), eg:
QgsProviderRegistry.instance().providerMetadata('ogr').createDatabase('/path/to/data.gpkg')
After that you can create a connection to the db using createConnection safely.
Nyall
Regards,
Richard Duivenvoorde
On 12/2/22 13:53, Richard Duivenvoorde via QGIS-Developer wrote:
Hi Raymond,
I've updated your test script a little:
gpkg_fn = '/tmp/test.gpkg'
try:
print(QgsProviderRegistry.instance().providerList())
md = QgsProviderRegistry.instance().providerMetadata('ogr')
print(f'md = {md}')
conn = md.createConnection(gpkg_fn, {})
print(f'conn = {conn}')
fields = QgsFields()
fields.append(QgsField('key', QVariant.String))
fields.append(QgsField('value', QVariant.String))
conn.createVectorTable('', 'test', fields, QgsWkbTypes.NoGeometry,
QgsCoordinateReferenceSystem(), True, {})
except Exception as e:
print(f'ERROR: {e}')
As said: in my freshly compiled master, this fails to run with 'Could not
retrieve driver for connection'
It also fails on my 3.28.0 version I have in a Windows VM.
It DOES print the 'ogr' driver in the providerList() though.
Strange behaviour: after starting (the older compiled) Qgis 3.26 on the same
Linux system (in 3.26 the script always seems to work...) QGIS master ALSO
works!!!
So I thought it had something todo with loading different provider registries
or so?
Maybe master not having something but after starting 3.26 it was there?
Or is it loading (different) gdal/ogr libs order?
Did something change there?
Looking that the createConnection docs:
https://qgis.org/pyqgis/master/core/QgsConnectionRegistry.html#qgis.core.QgsConnectionRegistry.createConnection
I thought to see that your 'id' was only the filename, but adding ogr:// in
front of it does not even work...
So not sure if that createConnection doc is old, or if I'm looking in the wrong
createConnection...
Anybody can
On 12/2/22 12:30, Raymond Nijssen via QGIS-Developer wrote:
No one having a clue? Should I create an issue?
Raymond
On 30-11-2022 18:08, Raymond Nijssen via QGIS-Developer wrote:
Hi developers,
Recently some users of my plugin started getting errors in the code that
creates a .gpkg file with a table. I wrote a piece of test code:
gpkg_fn = '/home/raymond/tmp/test.gpkg'
md = QgsProviderRegistry.instance().providerMetadata('ogr')
conn = md.createConnection(gpkg_fn, {})
fields = QgsFields()
fields.append(QgsField('key', QVariant.String))
fields.append(QgsField('value', QVariant.String))
conn.createVectorTable('', 'test', fields, QgsWkbTypes.NoGeometry,
QgsCoordinateReferenceSystem(), True, {})
That last line *sometimes* results in this error:
_core.QgsProviderConnectionException: Could not retrieve driver for connection
I cannot reproduce the error on my laptop (Linux), but Richard tried a few QGIS
versions in both Windows and Linux and *sometimes* got the error and sometimes
not. Even in the same application, the error disappeared after running another
version of QGIS simultaneously... :/
No clue if this error is GDAL or Qt or whatever related, pretty puzzling for
me. Hope anyone can help!
Kind regards,
Raymond
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