Hi Didier, 

I don't think that anyone is working on a client-side historisation
option in QGIS. And there wasn't much demand for that in the past, since
most serious GIS data resides in databases. 

Andreas 

On 2015-07-20 09:45, didier peeters wrote: 

> Hello Andreas, 
> 
> yes it's for some 'historisation', more precisely to make a filiation, and 
> yes I certainly will use triggers in PostGIS. But I wanted to avoid confusion 
> between different kind of edition operations that I'm not currently 
> foreseeing; I'm not sure it will always be easy to distinct this specific 
> action from others. And I thought that it might also be interesting outside 
> of the database world, to have that "edit and preserve" operation. 
> 
> Didier
> 
> Le 20 juil. 2015 à 09:10, Neumann, Andreas <a.neum...@carto.net> a écrit : 
> 
> Hi Didier, 
> 
> Is this for historisation purposes? If yes, I would look into database 
> solutions to do historization. 
> 
> The SQL-MM standard has this as a built-in tool set for databases, however, 
> PostgreSQL does not implement this part of the SQL specification (I believe 
> the latest versions of SQL server and Oracle 12 does). However, you can 
> simulate the same in Postgis, using triggers and rules. 
> 
> Andreas 
> 
> On 2015-07-20 08:00, didier peeters wrote: Hello, 
> 
> I would like to find the best solution to the following case: 
> 
> in QGis, when editing a polygon (splitting it in 2 parts) I need to save the 
> original shape, in order to keep the different steps of its evolution; this 
> operation is likely to be repeated several times. The solution I found is to 
> 
> * start by copying the polygon, 
> * then edit it (split) 
> * then pasting back the original one, 
> * then adjust and update the attributes of the 2 new polygons. 
> 
> Is there a less tricky way to achieve this ? 
> 
> If not it would be nice to have an option in the save dialog (with a default 
> behaviour set in the Settings), and I would file a feature request. 
> 
> Didier 
> 
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