Re: [QGIS-Developer] setDataSourceUri() not working
That works!! :O Thank you so much!!! Raymond On 09-12-2022 08:20, Andrea Giudiceandrea via QGIS-Developer wrote: Hi Raymond, I wrote setDataSource, not setDataSourceUri. Regards. Andrea Il 09/12/2022 08:19, Raymond Nijssen via QGIS-Developer ha scritto: Thanks Andrea, but that doesn't seem to exist: AttributeError: 'QgsVectorLayer' object has no attribute 'setDataSourceUri' Raymond On 08-12-2022 19:42, Andrea Giudiceandrea via QGIS-Developer wrote: *Raymond Nijssen* /Wed Dec 7 07:39:50 PST 2022/ I'm trying to change the dataSourceUri of an existing layer Hi Raymond, AFAIK you need to use setDataSource [1] directly on the layer an not setDataSourceUri on the data provider. E.g.: layer.setDataSource(new_ds, layer_name, 'ogr') Best regards. Andrea [1] https://qgis.org/pyqgis/master/core/QgsMapLayer.html#qgis.core.QgsMapLayer.setDataSource ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [QGIS-Developer] setDataSourceUri() not working
Hi Raymond, I wrote setDataSource, not setDataSourceUri. Regards. Andrea Il 09/12/2022 08:19, Raymond Nijssen via QGIS-Developer ha scritto: Thanks Andrea, but that doesn't seem to exist: AttributeError: 'QgsVectorLayer' object has no attribute 'setDataSourceUri' Raymond On 08-12-2022 19:42, Andrea Giudiceandrea via QGIS-Developer wrote: *Raymond Nijssen* /Wed Dec 7 07:39:50 PST 2022/ I'm trying to change the dataSourceUri of an existing layer Hi Raymond, AFAIK you need to use setDataSource [1] directly on the layer an not setDataSourceUri on the data provider. E.g.: layer.setDataSource(new_ds, layer_name, 'ogr') Best regards. Andrea [1] https://qgis.org/pyqgis/master/core/QgsMapLayer.html#qgis.core.QgsMapLayer.setDataSource ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [QGIS-Developer] setDataSourceUri() not working
Thanks Andrea, but that doesn't seem to exist: AttributeError: 'QgsVectorLayer' object has no attribute 'setDataSourceUri' Raymond On 08-12-2022 19:42, Andrea Giudiceandrea via QGIS-Developer wrote: *Raymond Nijssen* /Wed Dec 7 07:39:50 PST 2022/ I'm trying to change the dataSourceUri of an existing layer Hi Raymond, AFAIK you need to use setDataSource [1] directly on the layer an not setDataSourceUri on the data provider. E.g.: layer.setDataSource(new_ds, layer_name, 'ogr') Best regards. Andrea [1] https://qgis.org/pyqgis/master/core/QgsMapLayer.html#qgis.core.QgsMapLayer.setDataSource ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [QGIS-Developer] setDataSourceUri() not working
*Raymond Nijssen* /Wed Dec 7 07:39:50 PST 2022/ I'm trying to change the dataSourceUri of an existing layer Hi Raymond, AFAIK you need to use setDataSource [1] directly on the layer an not setDataSourceUri on the data provider. E.g.: layer.setDataSource(new_ds, layer_name, 'ogr') Best regards. Andrea [1] https://qgis.org/pyqgis/master/core/QgsMapLayer.html#qgis.core.QgsMapLayer.setDataSource___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [QGIS-Developer] setDataSourceUri() not working
Hi,
dataSourceUri is used when creating the dataProvider/vectorlayer and
there is no way to refresh the provider according to a new uri.
I don't see any other way than recreate a new QgsVectorLayer with the
new dataSource uri, add it to your project instance with addMapLayer and
remove the old one.
Maybe there is a trick to simplify things but I fail to see how.
Regards,
Julien
> Hi Devs,
>
> I'm trying to change the dataSourceUri of an existing layer, but can't
> get it working. The reason is that my layer should be connected to
> another view in the same database, because the db should do some
> calculations for my plugin.
>
> I created a test script for a simple polygon layer in a gpkg, which I
> attached to this email. The layer "polygons" and both views are all
> working correctly if you just drag and drop the gpkg in QGIS.
>
> Open the polygons layer and select it. Then run:
>
>
> layer = iface.activeLayer()
> provider = layer.dataProvider()
>
> ds = provider.dataSourceUri()
> print(ds)
>
> fn = ds.split('|layername=')[0]
> new_ds = fn + '|layername=highest_3_view'
> print(new_ds)
>
> provider.setDataSourceUri(new_ds)
>
>
>
>
> The first run displays 2 different dataSourceUris:
> path/to/test_views.gpkg|layername=polygons
> path/to/test_views.gpkg|layername=highest_3_view
>
> The second run displays 2x the same dataSourceUris:
> path/to/test_views.gpkg|layername=polygons
> path/to/test_views.gpkg|layername=highest_3_view
>
> So the string has been changed. But my layer properties still point to
> path/to/test_views.gpkg|layername=polygons
>
> and the features displayed are all 5 from the polygons layer. (The views
> have only 3 features)
>
>
>
> Should i do something after setting the new provider? I've been trying
> many things, including:
> * provider.reloadData()
> * layer.setDataProvider(dataprovider)
> * refreshing/redrawing the layer
>
>
> Hope anyone can help!
> Raymond___
> QGIS-Developer mailing list
> QGIS-Developer@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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[QGIS-Developer] setDataSourceUri() not working
Hi Devs,
I'm trying to change the dataSourceUri of an existing layer, but can't
get it working. The reason is that my layer should be connected to
another view in the same database, because the db should do some
calculations for my plugin.
I created a test script for a simple polygon layer in a gpkg, which I
attached to this email. The layer "polygons" and both views are all
working correctly if you just drag and drop the gpkg in QGIS.
Open the polygons layer and select it. Then run:
layer = iface.activeLayer()
provider = layer.dataProvider()
ds = provider.dataSourceUri()
print(ds)
fn = ds.split('|layername=')[0]
new_ds = fn + '|layername=highest_3_view'
print(new_ds)
provider.setDataSourceUri(new_ds)
The first run displays 2 different dataSourceUris:
path/to/test_views.gpkg|layername=polygons
path/to/test_views.gpkg|layername=highest_3_view
The second run displays 2x the same dataSourceUris:
path/to/test_views.gpkg|layername=polygons
path/to/test_views.gpkg|layername=highest_3_view
So the string has been changed. But my layer properties still point to
path/to/test_views.gpkg|layername=polygons
and the features displayed are all 5 from the polygons layer. (The views
have only 3 features)
Should i do something after setting the new provider? I've been trying
many things, including:
* provider.reloadData()
* layer.setDataProvider(dataprovider)
* refreshing/redrawing the layer
Hope anyone can help!
Raymond
test_views.gpkg
Description: application/geopackage
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