Hi Saka,
It sounds like you want to select a list of features and then find
additional features within a small distance of the first features? CQL
by itself (with no functions) is not powerful enough to express that in
one go. I think of CQL as the 'where' clause for a single SQL statement
with no joins.
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.
The benefit (and downside) of #1 is that you'll have complete control
over the process. If I were doing this, I'd probably start with #2.
The biggest gotchas there are with memory management.
Hope that help!
Jim
1. http://docs.geoserver.org/stable/en/user/extensions/querylayer/index.html
2. http://docs.geoserver.org/stable/en/user/data/database/sqlview.html
On 8/7/2016 3:45 AM, Saka Royban wrote:
Hi all.
I've searched google a lot for a question that sounds common to me but
i didn't found even a page.
How to combine comparison (attribute-based) predicates and spatial
(topological) predicates in a filter in CQL (though, i think there
would be no difference between CQL and filter encoding and solution
for one can be converted to other)?
I'm aware of logical operators but that doesn't satisfy my need. For
example, finding a feature which its name = 'someName' and then
finding adjacent features to this feature. Is it possible to combine
these two filter expression, at all? or it needs more javascript
programming than writing a simple filter string?
Regards
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