[Qgis-developer] Questions/Suggestion on virtual layers

Yves Jacolin yjacolin at free.fr
Wed Mar 2 07:39:39 PST 2016


I though that you can edit the request of your virtual layer. In the drop down 
list you c an choose the one to change.

Am I wrong?

On Wednesday, March 02, 2016 16:27:07 Neumann, Andreas wrote:
> Hi,
> I am experimenting with the virtual layers. They are quite cool!
> I have some suggesions/questions:
>  	* It would be nice to have a preview of my query results. Currently it
> is either it works - or not. If it works, but the results are wrong you
> have to start from scratch. I would suggest that when you press on the
> test button you would not only display "No error" or the error message,
> but maybe the first 10 rows of the result.
>  	* Updating the virtual layer: it would be really nice if I could
> edit/improve on my virtual layers without having to start completely
> from scratch. --> Oh - now I found out that if you select an existing
> virtual layer and then use "Layer" --> "Add Layer" --> "Add Virtual
> Layer", that you can refresh an existing virtual layer. This is really
> not obvious. I think this is more a usability issue.
>  	* it is not very obvious how you can reuse an already existing
> geometry column. I discovered it by accident, that you can use
> layer.geometry (regardless of the original name of the geometry column),
> but I think that it is not obvious. A better hint in the the tooltip
> would probably help.
>  	* Unique identifier column: If you join several tables, you often have
> the issue that you need to create an artificial primary key. Could we
> offer a preconfigured builtin pkey - something like a rowid  for such
> cases?
>  	* What is the exact purpose of the "Embedded Layers" where you can
> add/import/remove layers? I noticed that existing layers of the project
> work anyway without adding/importing them first. Is the idea that you
> can work on layers that aren't in the project?
> Should I open feature request tickets for these or are there already
> plans to address one or the other of the above issues?
> Thanks anyway for this interesting new feature!
> Andreas

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