[Qgis-developer] Ogr database access design and plans

[Tim Sutton]

Hi Godofredo

I also had a look through your design documents during the week and
generally liked the proposal. I think Martin makes some good points
below. My only concern of putting it in 'app' is that this
functionality wont be available to 3rd party apps using QGIS libs -
which would be a pity because I suspect in many cases it would be very
useful...

Regards

Tim

2007/12/7, Martin Dobias <wonder.sk at gmail.com>:
> Hi,
>
> first of all sorry for my late reply.
>
> I've been thinking quite a lot about the current design and future of
> vector providers, database connections etc. The things as you've
> designed them can be used well with the current status of QGIS - in
> case you will put the new classes to 'app' sources and not to the
> libraries.
>
> My vision is that after 1.0 we should improve our architecture for
> providers - and make it more similar to the one used in OGR.
> - OGR uses 'data source' for a compound of layers, this can be e.g. a
> database or a directory in file system. With data sources you open or
> create layers
> - QGIS uses 'providers' for accessing directly layers, but there's no
> abstraction on the level of data sources as in OGR. With addition of
> data sources (which are currently equivalent to database connections
> in your design) we will add much more functionality which is not
> supported currently by QGIS like some generic way to
> list/create/remove/rename etc. layers). This is I guess important part
> for our future common Load layer / data manager dialog.
>
> The future redesign is the reason why I think that the new classes
> you're working on should not go to core library. Once your new
> features land to trunk, we will be able to reuse the code when
> introducing 'data sources' term to QGIS slang. So go ahead with the
> coding, we're all looking forward to see the new features in action
> :-)
>
> Regards
> Martin
>
> On Nov 30, 2007 9:16 PM, godofredo contreras <frdcn at hotmail.com> wrote:
> >
> > Hi Martin:
> >
> > I have being working with the ogr database access document and modelling
> > the classes and interaction needed to enable ogr database access in qgis.
> > Attached are a doc document describing the changes planned, the classes
> > and dialogs that will be affected and a jpeg image of the model with your
> > suggestions
> > applied. Could you please give me your comments and suggestions.
> >
> > Regards
> >
> > Godofredo Contreras
> >
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Tim Sutton
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