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<div class="moz-cite-prefix">Hi Stephan,<br>
<br>
We modified the postgis-workshop tutorial for qgis plugin
development to use the new python api of qgis 1.9, there are
examples of feature access in there:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://github.com/Oslandia/postgis-workshop">https://github.com/Oslandia/postgis-workshop</a><br>
<br>
Cheers,<br>
<br>
Vincent.<br>
<br>
On 17/07/2013 21:13, Stéphane Henriod wrote:<br>
</div>
<blockquote
cite="mid:CAK6pVBUhynefjv2b4xfxDiAe37=ZGSrjqw6a8d4BQExNz5DRhA@mail.gmail.com"
type="cite">
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<div>
<div>
<div>
<div>
<div>Dear all<br>
<br>
</div>
I am trying to get into the new 2.0 API and am still
facing issues for very basic stuff: getting the values
of the attributes out of a PostGIS layer.<br>
<br>
</div>
Basically, it works (with the almost same code) in the
Qgis python console, but I don't manage to get it to work
in a stand-alone script.<br>
<br>
</div>
What I have so far is a PostGIS layer, that I load with:<br>
<br>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px
solid rgb(204,204,204);padding-left:1ex"
class="gmail_quote">
<i>uri = QgsDataSourceURI()<br>
uri.setConnection('localhost', '5432', 'db_name',
'user_name', 'password')<br>
uri.setDataSource('my_schema', 'my_table', 'the_geom')<br>
<br>
my_layer =
QgsVectorLayer(uri.uri(),'myhospitals','postgres')<br>
</i></blockquote>
<br>
</div>
A quick test shows me that the layer has been successfully
loaded:<br>
<br>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px
solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
<i>if not my_layer.isValid():<br>
print "Layer failed to load!"<br>
else:<br>
print "Layer loaded successfully"<br>
</i></blockquote>
<br>
</div>
I would assume that<br>
<br>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px
solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
<i>for elem in my_layer.getFeatures():</i><br>
<i> print elem.attributes()</i><br>
</blockquote>
<div>
<div>
<div><br>
</div>
<div>should return the attributes in a usable format but,
instead, I get:<br>
<i><br>
</i>
<blockquote style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex" class="gmail_quote">
<i>[<PyQt4.QtCore.QVariant object at 0xad37aca4>,
<PyQt4.QtCore.QVariant object at 0xad37acdc>,
None, <PyQt4.QtCore.QVariant object at
0xad37ad14>]</i><br>
<i>[<PyQt4.QtCore.QVariant object at 0xad37aca4>,
<PyQt4.QtCore.QVariant object at 0xad37acdc>,
<PyQt4.QtCore.QVariant object at 0xad37ad14>,
<PyQt4.QtCore.QVariant object at 0xad37ad4c>]</i><br>
<i>[<PyQt4.QtCore.QVariant object at 0xad37aca4>,
<PyQt4.QtCore.QVariant object at 0xad37acdc>,
<PyQt4.QtCore.QVariant object at 0xad37ad14>,
<PyQt4.QtCore.QVariant object at 0xad37ad4c>]</i><br>
<i>[<PyQt4.QtCore.QVariant object at 0xad37aca4>,
<PyQt4.QtCore.QVariant object at 0xad37acdc>,
<PyQt4.QtCore.QVariant object at 0xad37ad14>,
<PyQt4.QtCore.QVariant object at 0xad37ad4c>]</i><br>
</blockquote>
</div>
<div><br>
</div>
<div>Does anyone have an idea where the problem could lie?<br>
<br>
</div>
<div>For those who speak French, the question is posted here
as well: <a moz-do-not-send="true"
href="http://www.forumsig.org/showthread.php/37178-Nouvelle-API-r%C3%A9cup%C3%A9rer-les-valeurs-attributaires">http://www.forumsig.org/showthread.php/37178-Nouvelle-API-r%C3%A9cup%C3%A9rer-les-valeurs-attributaires</a><br>
</div>
<div><br>
</div>
<div>I am using Qgis 1.9.0 with Python 2.7 on Ubuntu 13.04<br>
<br>
</div>
<div>Thanks in advance for ideas and comments...<br>
<br>
Cheers<br>
<br>
Stéphane<br clear="all">
</div>
<div>
<div>
<div>
<div>
<div>
<div>
--<br>
"Le mot progrès n'aura aucun sens tant qu'il y
aura des enfants malheureux" -- Albert Einstein<br>
<br>
"A journey does not need reasons. Before long,
it proves to be reason enough in itself. One
thinks that one is going to make a journey, yet
soon it is the journey that makes or unmakes
you." -- Nicolas Bouvier<br>
<br>
Photos de voyages, photos de montagne: <a
moz-do-not-send="true"
href="http://www.henriod.info/"
target="_blank">http://www.henriod.info</a><span
dir="ltr"><span dir="ltr" title="Appeler ce
numéro de téléphone en/au(x) Tadjikistan
avec Skype : +992934624662"><span> </span></span>
<br>
</span></div>
</div>
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