Hi Marco,
If you have the "watch file" option of your CSV file active it will
reread data when file content changes and when your redraw your map
(either through navigation or redraw button).
I guess you could also write a small Python script if you want to
automatically trigger an update at a given interval. Maybe there is
already a plugin available - I did not look.
Andreas
On 18.09.2015 10:15, Dr. Marco Lechner 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 <mlech...@bfs.de
<mailto:mlech...@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
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SW2.1 Koordination Notfallschutzsysteme / Coordination Emergency Systems
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