Hi ! Is it possible to change the query of a postgis query layer in python without reloading the project ?
The goal is to have a parameter in my query that I'd be able to change with a slider. I tried the QgsVectorLayer.setDataSource() method, but it makes QGis crash. I tried the workaround described here ( http://gis.stackexchange.com/questions/62610/changing-data-source-of-layer-in-qgis ), writing and reading the XML file, but it also makes QGis crash. If not possible, is there a serious limitation behind this, or is the feature just missing/bugged ? Example : I have this query loaded as a layer: "SELECT id, name, ST_Buffer(geom,25) as geom FROM my_table" But I want to be able to change the hardcoded buffer from 25 to some value from a QSlider. Thanks! Olivier
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