[Qgis-user] automatically reload (csv) file

Fri Sep 18 02:57:09 PDT 2015

Hi Delazj,

Yes - I was assuming that people would use the "Add delimited text layer 
tool". Sorry - I forgot to mention that. It is more flexible and easier 
to use than the "Add vector layer" dialogue.

About CSV, joins and updates: have you checked the cache vs. uncached 
option for your joins?

Andreas

On 18.09.2015 11:47, DelazJ wrote:
> Hi,
> Andreas, unless you add the csv file with "Add delimited text layer" 
> tool, I'm afraid there's not a "watch file" option available.
>
> I just add a csv file to a qgis project with "add a vector layer" 
> tool. I open the same csv in a text editor and change some values. 
> While reopening the csv file attribute table in QGIS, values were 
> already uptodate. I've done nothing special. So I'm not sure if QGIS 
> requiers a particular action to sync data.
> But what seems buggy is that even if the csv file attribue table is 
> updated in QGIS, if this csv was joined to a shapefile, the changes 
> won't be applied in the shapefile's attribute table. Can someone confirm?
> I can't get changes with the "Refresh" button.
>
> Tested with qgis ltr 2.8.3
>
>
> 2015-09-18 10:38 GMT+02:00 Andreas Neumann <a.neumann at carto.net 
> <mailto:a.neumann at carto.net>>:
>
>     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 <mlechner at bfs.de <mailto:mlechner at bfs.de>
>>>     <mailto: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>  <mailto:mlechner at bfs.de> <mailto:mlechner at bfs.de>  |+49 (0)3018 333 6724 <tel:%2B49%20%280%293018%20333%206724>
>>>          <tel:%2B49%20%280%293018%20333%206724> |www.bfs.de <http://www.bfs.de>  <http://www.bfs.de> <http://www.bfs.de>
>>>
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