[Qgis-user] Maximum wfs layers in qgis?

Mon Aug 21 11:55:37 PDT 2017

When I look in the cache/wfsprovider folder, there's another folder with
almost three times the layer number in other files: wfs_cache_XX.sqlite,
-shm, and -wal.

I had to track down a public wfs with a small enough sample set to be
repeatable. This Python code gives the error in 2.18.7 and a 2.99 nightly I
grabbed for testing:

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example01","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example02","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example03","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example04","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example05","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example06","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example07","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example08","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example09","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example00","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example11","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example12","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example13","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example14","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example15","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example16","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example17","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example18","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example19","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example10","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example21","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example22","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example23","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example24","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example25","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example26","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example27","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example28","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example29","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example20","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example31","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example32","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example33","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example34","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example35","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example36","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example37","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example38","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example39","WFS")

iface.addVectorLayer(' restrictToRequestBBOX=\'1\' srsname=\'EPSG:4326\'
typename=\'sdr:nyu_2451_34490\' url=\'https://maps-public.geo.
nyu.edu/geoserver/sdr/wfs\' version=\'auto\' table=""
sql=',"example30","WFS")

On Aug 21, 2017 12:55 PM, "Jorge Gustavo Rocha" <jgr at di.uminho.pt> wrote:

Hi Dan,

QGIS uses a local SpatiaLite database to store the features on the
client side. The cache should be in your .qgis2/cache/wfsprovider
folder. Can you check the contents of the folder?

If your WFS is a public server, can your share the service URL and the
layer/layers to reproduce the problem?

Regards,

J. Gustavo

On 21-08-2017 16:42, Dan Meerschaert wrote:
> I'm working on a plugin for QGIS 2.18.7 on Windows that (as a part of
> its other function) grabs many wfs layers at once.
>
> The problem is, after about 30-50 simultaneous connections, QGIS throws
> up a "Cannot create temporary SpatiaLite cache" error in the WFS log
> panel and doesn't load all the data.
>
> I'm able to repeat this by picking any given wfs layer, and duplicating
> it manually using iface.addVectorLayer (...) in the python console.
>
> Can anyone help me out?
>
> Respectfully,
> -Dan
>
>
> _______________________________________________
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J. Gustavo
--
Jorge Gustavo Rocha
Departamento de Informática
Universidade do Minho
4710-057 Braga
Tel: +351 253604480
Fax: +351 253604471
Móvel: +351 910333888
skype: nabocudnosor
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