Hi Andrea,
Thanks for noting the WFS 2.0 joins (I obviously didn't know about them:)).
Is the join delegated to the GeoTools DataStore level or does GeoServer
execute queries across the layers?
Cheers,
Jim
On 8/7/2016 10:52 AM, Andrea Aime wrote:
On Sun, Aug 7, 2016 at 4:28 PM, Jim Hughes <jn...@ccri.com
<mailto:jn...@ccri.com>> wrote:
Given all that, there are two, maybe three options: 1. Handle
the two phases of querying yourself in client code (as you
suggested) or 2. Use the GeoServer Cross-Layer filtering
plugin(1). 3. If all your queries look mostly the same, you
might be able to get away with a SQL View assuming you are using a
traditional database like PostGIS.
Option number 4, use WFS 2.0 joins. Mind, they are not fully
implemented, but should be able to answer the query you specify.
First downside, they always return full tuples, that is, if you join
ft1 and ft2, you'll get back tuples made of a full ft1 feature
and a full ft2 feature.
Second downside, you basically have to figure out how to write a join
by reading the specs,
although we have some examples here (yes, you cannot use CQL, they
have to be POST xml requests):
https://github.com/geoserver/geoserver/blob/master/src/wfs/src/test/java/org/geoserver/wfs/v2_0/GetFeatureJoinTest.java
Cheers
Andrea
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