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I'm working on a Dockwidget with PyQgis.

I made an insert into an Oracle DB and a Spatialite DB and I would like to see the new insert (it's a point).

enter image description here

The Layer where the new point is add is URB_A_ADPT. I'm sure the point is create because I see it in my DB and attribute table. For now, when I zoom and dezoom the point appears but I would like to see it directly.

I tried to simply add 

self.refresh = self.canvas.refreshAllLayers()

but it don't seems to be enough to refresh my Oracle layer.

I also tried 

if iface.mapCanvas().isCachingEnabled():
    layer.triggerRepaint()
else:
    iface.mapCanvas().refresh()

from the idea of @andreas-müller but once again I don't see anything.

And my last idee was to set zoom and then directly dezoom

active_layer = iface.activeLayer()
active_layer.zoomFull()
active_layer.zoomToPrevious()

but it don't work.

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layer = iface.activeLayer()

if iface.mapCanvas().isCachingEnabled():
    layer.triggerRepaint()
else:
    iface.mapCanvas().refresh()

This one is from the docs, and as mentioned there, it should refresh the query from your database, too. I added a layer-access by iface.activeLayer(), but it could be any method to get a reference to the layer which needs to be refreshed.

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  • Finally, I was able to use the layer.triggerRepaint() but I didn't know how to specify the layer, I needed : layer = QgsProject.instance().mapLayersByName("layer_name")[0] layer.triggerRepaint() , but I don't use the Oracle DB for the visual anymore, Spatialite goes faster. Also I didn't need isCachingEnabled() and iface.mapCanvas().refresh(). If you edit your answer with the definition of the layer (and maybe without "if else" but not sure (?) ) I will accept it ! – Svhooren Dec 18 '19 at 15:00
  • Also, should I edit my question only for Spatialite because I didn't try to use Oracle again ? ( and Thank you for the help by the way !) – Svhooren Dec 18 '19 at 15:06
  • this could be usefull, but the problem with the Oracle-DB may also be important. Because Oracle is really complex, it would be an idea to ask that question in another stackexchange site. – Andreas Müller Dec 18 '19 at 16:02
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For Spatialite:

It works when I specify the layer and set auto refresh:

layer = QgsProject.instance().mapLayersByName("my_layer_name")[0] 
layer.setAutoRefreshInterval(500)
layer.setAutoRefreshEnabled(True)

For Oracle it takes too much time for the visual part, so I interact with spatialite in QGis, but I make my SQL statements on the two DB in parallel.

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  • Auto Refresh was a temporary solution, but it takes a lot of memory, I don't recommend it with big database (such as mine) ! – Svhooren Dec 18 '19 at 14:50

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