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 >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> >> http://lists.osgeo.org/mailman/listinfo/qgis-user >> <http://lists.osgeo.org/mailman/listinfo/qgis-user> >
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