[Qgis-user] QGIS layer to postgis database

[xristosss20]

I have two layers(layer1,layer2) in postgis database where I have connect in
QGIS project.
my database have specific precision.
now I want to use from QGIS processing some algorithms like
GISDIFFERENCE(for example I know tew postgis have query for this).
but I don't know how to import the algorithm output in postgis database
automatic to keep my database precision.
for example if I try to run graphical this tool show me choose to save as to
postgis database.
but how to do this using pyqgis ?because I want to create a QGIS plugin
some way is to run algorithms and I save manual the output to shapefile and
after to import this shapefile to postgis database like this :

outputs_QGISDIFFERENCE_1=processing.runalg('qgis:difference',
layer1,layer2,False,None)
load= QgsVectorLayer(outputs_QGISDIFFERENCE_1['OUTPUT'],'myname', 'ogr')
 QgsMapLayerRegistry.instance().addMapLayer(load)

and save to postgis database.
but that way create it me topology error because I loose the database
precision if I use the graphical way to save as to postgis database then
that layer is correct.
but how to do this using pyqgis ?



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