[QGIS-Developer] QGIS/OGR: FeatureIds reassigned on write to data provider?

[Nyall Dawson]

On 5 July 2017 at 09:10, Nathan Woodrow <madmanwoo at gmail.com> wrote:
>>
> A common workflow that leads to this situation is when working on shapefiles
> and then using them in a processing algorithm that involves an external
> process. The processing situation could be avoided (detect if potentially
> dangerous operations like a delete have been performed since the last repack
> and if yes repack or write it to a new file), but there were also other
> situations where people just have been working on the same file in different
> GIS applications side-by-side.
>
>
> This raises the question.  Should we support that?  A lot of file types are
> just not meant to be opened by many applications at the same, e.g MapInfo
> wants a full exclusive read/write lock on tab files.  My gut has always been
> if it's file based you shouldn't be using it in other applications at the
> same time.


I'd say we definitely do in the processing case. It'd be a significant
shortcoming to have to manually unload layers from projects before you
can run analysis on them.

Not sure about totally external applications though....

Nyall