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Hi Delazj,<br>
<br>
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.<br>
<br>
About CSV, joins and updates: have you checked the cache vs.
uncached option for your joins?<br>
<br>
Andreas<br>
<br>
<div class="moz-cite-prefix">On 18.09.2015 11:47, DelazJ wrote:<br>
</div>
<blockquote
cite="mid:CAECJsSpi6q3tjEWw=e0pL-6D36ycq-b7oFMnrq9D8GbnF6XB9g@mail.gmail.com"
type="cite">
<div dir="ltr">
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<div>
<div>Hi,<br>
</div>
Andreas, unless you add the csv file with "Add delimited
text layer" tool, I'm afraid there's not a "watch file"
option available.<br>
<br>
</div>
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.<br>
</div>
<div>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?<br>
</div>
<div>I can't get changes with the "Refresh" button.<br>
<br>
</div>
Tested with qgis ltr 2.8.3<br>
<br>
<div>
<div>
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<div>
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<div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2015-09-18 10:38
GMT+02:00 Andreas Neumann <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:a.neumann@carto.net"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:a.neumann@carto.net">a.neumann@carto.net</a></a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hi
Marco,<br>
<br>
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).<br>
<br>
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.<br>
<br>
Andreas
<div>
<div class="h5"><br>
<br>
<div>On 18.09.2015 10:15, Dr. Marco
Lechner wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<pre>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:
</pre>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<pre>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 <<a moz-do-not-send="true" href="mailto:mlechner@bfs.de" target="_blank">mlechner@bfs.de</a>
<a moz-do-not-send="true" href="mailto:mlechner@bfs.de" target="_blank"><mailto:mlechner@bfs.de></a>> 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
(<a moz-do-not-send="true" href="https://plugins.qgis.org/plugins/SyncQGISWithDir/" target="_blank">https://plugins.qgis.org/plugins/SyncQGISWithDir/</a>) 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
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