Hi Stephan, 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:
https://github.com/Oslandia/postgis-workshop Cheers, Vincent. On 17/07/2013 21:13, Stéphane Henriod wrote: > Dear all > > 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. > > 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. > > What I have so far is a PostGIS layer, that I load with: > > /uri = QgsDataSourceURI() > uri.setConnection('localhost', '5432', 'db_name', 'user_name', > 'password') > uri.setDataSource('my_schema', 'my_table', 'the_geom') > > my_layer = QgsVectorLayer(uri.uri(),'myhospitals','postgres') > / > > > A quick test shows me that the layer has been successfully loaded: > > /if not my_layer.isValid(): > print "Layer failed to load!" > else: > print "Layer loaded successfully" > / > > > I would assume that > > /for elem in my_layer.getFeatures():/ > / print elem.attributes()/ > > > should return the attributes in a usable format but, instead, I get: > / > / > > /[<PyQt4.QtCore.QVariant object at 0xad37aca4>, > <PyQt4.QtCore.QVariant object at 0xad37acdc>, None, > <PyQt4.QtCore.QVariant object at 0xad37ad14>]/ > /[<PyQt4.QtCore.QVariant object at 0xad37aca4>, > <PyQt4.QtCore.QVariant object at 0xad37acdc>, > <PyQt4.QtCore.QVariant object at 0xad37ad14>, > <PyQt4.QtCore.QVariant object at 0xad37ad4c>]/ > /[<PyQt4.QtCore.QVariant object at 0xad37aca4>, > <PyQt4.QtCore.QVariant object at 0xad37acdc>, > <PyQt4.QtCore.QVariant object at 0xad37ad14>, > <PyQt4.QtCore.QVariant object at 0xad37ad4c>]/ > /[<PyQt4.QtCore.QVariant object at 0xad37aca4>, > <PyQt4.QtCore.QVariant object at 0xad37acdc>, > <PyQt4.QtCore.QVariant object at 0xad37ad14>, > <PyQt4.QtCore.QVariant object at 0xad37ad4c>]/ > > > Does anyone have an idea where the problem could lie? > > For those who speak French, the question is posted here as well: > http://www.forumsig.org/showthread.php/37178-Nouvelle-API-r%C3%A9cup%C3%A9rer-les-valeurs-attributaires > > I am using Qgis 1.9.0 with Python 2.7 on Ubuntu 13.04 > > Thanks in advance for ideas and comments... > > Cheers > > Stéphane > -- > "Le mot progrès n'aura aucun sens tant qu'il y aura des enfants > malheureux" -- Albert Einstein > > "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 > > Photos de voyages, photos de montagne: http://www.henriod.info > <http://www.henriod.info/> > > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer
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