[Qgis-user] automatically reload (csv) file

[Nicola Poles]

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 <mlechner at bfs.de> 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 <mlechner at bfs.de
> > <mailto:mlechner at bfs.de>> 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
> >     mlechner at bfs.de <mailto:mlechner at bfs.de> | +49 (0)3018 333 6724
> >     <tel:%2B49%20%280%293018%20333%206724> | www.bfs.de <
> http://www.bfs.de>
> >
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