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I'm trying to write a plugin that among athor things adds a layer from a database. Here is my code:

        uri = QgsDataSourceUri()
        # set host name, port, database name, username and password
        uri.setConnection("geoerpdev2", "5432", "LAIS_SPACIAL", "postgres", "Passsword")
        # set database schema, table name, geometry column and optionally
        # subset (WHERE clause)

        uri.setDataSource("spacial", "parcels", "geom","cell_code=3030404")
        if uri:
            print (uri)

        vlayer = QgsVectorLayer(uri.uri(), "parcels", "postgres")
        if not vlayer.isValid():
            print (uri)
            print (vlayer)
        QgsProject.instance().addMapLayers([vlayer])

When I change setDataSource as sugested to:

uri.setDataSource("spacial", "parcels", "geom","\"cell_code\"='3030404'")

Still nothing happens.

In the python console this is what is printed:

<qgis._core.QgsDataSourceUri object at 0x000002F5CA5C9EE8>
<qgis._core.QgsVectorLayer object at 0x000002F5CA5E8C18>
dbname='LAIS_SPACIAL' host=geoerpdev2 port=5432 user='postgres' password='Password' table="spacial"."parcels" (geom) sql=cell_code=3030404

This is the info about the layer when I load it manually: enter image description here

I based my code on this example here.

Can someone detect why nothing is loading?

  • Did my answer sort this out? – Alex Leith Apr 3 '18 at 0:44
  • It did not sadly:\ – Carmel Han Apr 3 '18 at 4:47
  • Oh, bugger... does it work without the filter? – Alex Leith Apr 3 '18 at 23:30
  • It'd be good to get the filter working, though! At lease we know that part is right ;-). – Alex Leith Apr 5 '18 at 23:13
2

Perhaps the quotes are important. Try it with this:

uri.setDataSource("spacial", "parcels", "geom","\"cell_code\"='3030404'")

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