[Qgis-user] Saving a polygon in QGis before to edit it

[Neumann, Andreas]

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.neumann at 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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