[Qgis-developer] Questions/Suggestion on virtual layers

Neumann, Andreas a.neumann at carto.net
Wed Mar 2 08:04:15 PST 2016

Hi Yves, 

Thanks for your reply. What drop down list are you talking about? In
what menu/dialogue/context menu? 


On 2016-03-02 16:39, Yves Jacolin wrote:

> Andreas,
> 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?
> Y.
> 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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