PyQGIS method to add multiple GDB files?

Question

I can use the following to add multiple shapefiles to QGIS:

import os, glob

layers=[]
shape_path = "C:\Users\Me\Desktop\Test\Shapefiles\\"
for shape in glob.glob(shape_path + "*.shp"):
    layer = QgsVectorLayer(shape, os.path.basename(shape), "ogr")
    layers.append(layer)
QgsMapLayerRegistry.instance().addMapLayers(layers)

However, I have dozens of .gdb folders which I would like to add automatically (I can do this individually through Layer > Add Vector Layer but would be quite tedious).

Is there a similar, or albeit another, method using PyQGIS to add multiple GDB files?

Answer 1

This aims to be a generic answer.

If you are able to load a layer in QGIS you can query its uri through the python console:

iface.activeLayer().dataProvider().dataSourceUri()

in the printed uri you can easily tell, which part of the uri should be dynamically created and write python logic that substitutes this part, e.g. with glob results.

The first parameter passed to the QgsVectorLayer constructor is nothing but this uri. The second parameter is the human readable layer name, the third parameter a provider key. The provider key can be queried with

iface.activeLayer().dataProvider().name()

For .gdb the provider key is also 'ogr'.

---

> iface.activeLayer().dataProvider().dataSourceUri()
u'/home/user/geodata/demo.gdb|layername=TOWNSSURVEY_POLYM'
> l=QgsVectorLayer(u'/home/user/geodata/demo.gdb|layername=TOWNSSURVEY_POLYM', 'survey', 'ogr' )
> l.isValid()
True
> QgsMapLayerRegistry.instance().addMapLayers([l])
[<qgis._core.QgsVectorLayer object at 0x7f8c7610a808>]

Answer 2

You can use the practically similar method for shapefiles but the path must be set before using glob:

import os, glob

layers=[]
os.chdir("C:\Users\Me\Desktop\Test\\Shapefiles")
for fname in glob.glob("*.gdb"):
    layer = QgsVectorLayer(fname, os.path.basename(fname), "ogr")
    layers.append(layer)
QgsMapLayerRegistry.instance().addMapLayers(layers)

Hope this helps others!