I have different qgis project with some layer and their datasource like ../my_path/my_file.shp. I need to insert this shp file to a remote db. For do it i use shapefile from PGeo module and it's work fine. But i need change layer datasource in qgs project with dbname= , host etc where schema_name is a name of qgis project, table_name is a layer id, and i need to maintain all layer's property. I tried to use:

 uri = QgsDataSourceURI()
 uri.setConnection("localhost", "5432", "mydb", "postgres", "postgres")
 layer = QgsVectorLayer(uri.uri(), str(layer.id()), "postgres")
 print layer.source()
 if not layer.isValid():
    print "Layer is not valid"

But i always got "Layer is not valid" and nothing is changed on my qgis project. Is there another way to change layer datasource and save changes to the project? I see this solution but it doesn't work for me

  • in uri.setDataSource(str(schema_name),str(layer.id()),'the_geom') instead of layer.id() (that is something internal to qgis, use the table name of your db. – Luigi Pirelli Apr 28 '15 at 8:12
  • str(layer.id()) is my table name. – sasha Apr 28 '15 at 8:59
  • are you sure? layer.id() if layer is a QgsVectorLayer return the layer name plus a random number! – Luigi Pirelli Apr 28 '15 at 9:28
  • yes,when i export my shp file into postgres db i do it like schema_name - my qgis project name, and table_name like internal id of layer i export. – sasha Apr 28 '15 at 9:35
  • I use this comand for export my shp file to db: shapefile._import_shapefile(host='localhost',port = 5432,dbname='mydb',user='postgres',password='postgres',shapefile = layer.source(),table =str(schema_name+"."+layer.id()),overwrite = 'false',encoding='UTF8') – sasha Apr 28 '15 at 9:51

It's seem that's uri is a key sensitive, so I solved a problem with:

table_name = table_name.lower()
schema_name = schema_name.lower()
uri.setDataSource(schema_name,table_name,"the_geom", '', 'gid')

After this change layer.isValid() return true

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