[Qgis-user] WFS caching behaviour

[Jukka Rahkonen]

Jonathan Moules <jonathanmoules at ...> writes:

> 
> 
> Hi List,Before I report this one as a bug, I figured I should check.
> 
> What's the desired behaviour of the WFS client in QGIS in respect to
caching results versus making new requests.
> 
> 
> Example:
> WFS server only returns 500 results for any given request. There are 51639
features in the layer.
> 
> - If I load the layer using the "Cached" checkbox as ticked, then QGIS
only loads 500 features. Fine.
> 
> 
> - If I then add the layer again, but with "cached" unticked, then QGIS
only loads 500 features - but they're 500 different features. Fine.
> 
> Except in both cases when I zoom in/out, the features don't change; QGIS
doesn't make new requests. I thought it was supposed to, at least with the
uncached version? Both appear to behaving the exact same way to me.
> 
> Am I doing something wrong?

Hi,

Made a trial with v. 2.0.1 and checked with Fiddler2 proxy what happens (I
recommend). 
- With caching a plain GetFeature is sent and you will get the 500 first
records.
- Without caching QGIS adds a BBOX filter and applies the extents of the
current map view. You will get the first 500 records within the box.
- After zooming/panning a new request with BBOX filter gets fired.

I can't say why QGIS does not send new features for you. But you a the one
who should absolutely install Fiddler or some other logging proxy and you
can do loads of wonderful bug reports in the future.

-Jukka Rahkonen-


> 
> Thanks,Jonathan
> 
> 
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