[Qgis-developer] Virtual layers for QGIS

[Nathan Woodrow]

+1 for me. A good feature IMO.

I think so of the UI needs work but that is easy enough to do after merge.

On Wed, 1 Jul 2015 6:17 pm Hugo Mercier <hugo.mercier at oslandia.com> wrote:

> Hi all,
>
> Probably not the perfect timing, but anyway, I would like to move
> forward on that topic of virtual layers.
>
> The current implementation has already some use cases. It is not as
> integrated into the expression engine as we might want, but it offers
> possibilities that were hard to achieve before.
>
> It consists merely of a new vector data provider. It does not depend on
> particular modifications in QGIS. So the impact on the current API is
> null. There will be some glue code in the app part of course,
> but apart from that, I think including it into the core as just another
> data provider won't bother other possible future implementations around
> this concept. And it will serve as a functional prototype.
>
> We may want to tag it as experimental or something like this, saying
> that this is probably not the final (or the only) way QGIS will handle
> the concept of "virtual layers" in the future.
>
> And because it is only a data provider (... and a class in DBManager),
> people may choose not to ship it with their binary version of QGIS if
> they don't want to.
>
> So ... is there any objection against that being pushed as a new vector
> data provider for the 2.12 ?
>
> On 11/05/2015 16:11, Hugo Mercier wrote:
> > Hi all,
> >
> > I've been recently involved in the development of "virtual layers" for
> > QGIS. The topic has already been discussed previously. In a few words it
> > allows to craft SQL queries (with spatial support) on any vector
> > layer(s) that QGIS is able to load.
> >
> > Now I have a plugin that is usuable and allows you to get familiar with
> > the concept and test it.
> >
> > More details are given here (with links to some videos):
> > https://github.com/mhugo/qgis_vlayers
> >
> > A binary version of the plugins for Windows 32bits is available here :
> > http://91.121.102.10/vlayers/qgis_28_vlayers_4_win32.zip
> >
> > An integration of virtual layers in db manager is provided, but it is
> > better served with an improved version of db manager. A pull request
> > about this is being reviewed (https://github.com/qgis/QGIS/pull/2025).
> > You can also directly find it here :
> >
> http://91.121.102.10/vlayers/db_manager_with_query_builder_and_vlayers.zip
> >
> > Please do not hesitate to test this new functionality and report bugs or
> > requests (here or on the github page)
> >
> > Now the next step would be to lead toward a proper integration into QGIS
> > core. I am already aware of some limitations that I have listed. I would
> > be happy to have any other feedback.
> >
> > The hackfest next week could also be a good place to discuss it (I will
> > be presenting it during the conference)
> >
> > Cheers.
> > Hugo
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> >
> >
>
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