It reads the datasource and updates the layer accordingly, including the coordinates and all the attributes.
On Fri, Sep 18, 2015 at 10:15 AM, Dr. Marco Lechner <[email protected]> wrote: > Hi Nicola, > > I guess this will only redraw the features in the mapcanvas, but not > necessarily read the datasource file, but I'm not sure about this. > > Marco > > Am 18.09.2015 um 10:02 schrieb Nicola Poles: > > To reload a CSV file you can press the Refresh button on the toolbar or > > press the "F5" key > > > > Nicola > > > > On Fri, Sep 18, 2015 at 9:16 AM, Dr. Marco Lechner <[email protected] > > <mailto:[email protected]>> wrote: > > > > Hi, > > > > how (often) does QGIS read features from a file (like csv or shape - > > differences?)? I realize I do not really know how the datasource - > qgis- > > communication goes. > > > > Imaine you have a csv or shape file that is loaded into QGIS but is > > automatically replaced from time to time (or lets say externally > > edited). Using a database- instead of file-based approach is better > for > > sure, but still it is not clear when / how often (on which events) > QGIS > > requests features from the datasources. > > > > As an idea in mind I see, the nice Sync-Plugin > > (https://plugins.qgis.org/plugins/SyncQGISWithDir/) can monitor > folders > > and notify the user if a new layer is available in a folder (well it > > does not take care of a changed layer (new timestamp of file, but > adding > > this functionality should not be such a big thing). The user could > also > > be notified when a layers file changed. > > > > But I'm not sure what was the best way to implement the (re)loading > of > > an already loaded layer. Do I have to drop the layer and reload it > > (including keeping the style) or is there a more efficient way? > > > > Marco > > > > -- > > Dr. Marco Lechner > > Bundesamt fuer Strahlenschutz / Federal Office for Radiation > Protection > > SW2.1 Koordination Notfallschutzsysteme / Coordination Emergency > Systems > > Rosastrasse 9 | D-79098 Freiburg | Germany > > [email protected] <mailto:[email protected]> | +49 (0)3018 333 6724 > > <tel:%2B49%20%280%293018%20333%206724> | www.bfs.de < > http://www.bfs.de> > > > > -- > > Hinweis zu Anhängen die auf .p7m/.p7c/.p7s oder .asc/.asc.sig enden: > > Die .p7?- und .asc-Dateien sind ungefährliche Signaturdateien > (digitale > > Unterschriften). > > In E-Mail-Clients mit S/MIME Konfiguration (.p7?) oder > PGP-Erweiterung > > (.asc) dienen sie zur: > > - - Überprüfung des Absenders > > - - Überprüfung einer evtl. Veränderung des Inhalts während der > > Übermittlung über das Internet > > Die Signaturdateien können ebenso dazu verwendet werden dem Absender > > dieser Signatur eine E-Mail mit verschlüsseltem Inhalt zu senden. > > > > In E-Mail-Clients ohne S/MIME Konfiguration oder PGP-Erweiterung > > erscheinen die Dateien als Anhang und können ignoriert werden. > > > > _______________________________________________ > > Qgis-user mailing list > > [email protected] <mailto:[email protected]> > > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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