The documentation on the jdbc datastores is very light:
- http://docs.geotools.org/latest/userguide/library/jdbc/db2.html
- http://docs.geotools.org/latest/userguide/library/jdbc/h2.html (not even
enough to be supported)
Mostly just enough to have a single code example for "supported" status. I know
there is a lot more substance there with respect to how id generation and so on
is handled.
As for the capabilities; returning the list of mapped functions in a
FilterCapabilities data structure would be a good idea.
There was a recent question (directed at andrea) about how to add more
functions to the list of those "supported" for direct mapping into SQL. Your
best bet is to hunt down that email and look at the classes in question; and
yeah if you can figure out what is supported it would make a great addition to
the documentation.
Looking it up now; lol - apparently you asked the question (with respect to the
concat function).
--
Jody Garnett
On Thursday, 26 May 2011 at 2:06 PM, Niels wrote:
> Hi,
>
> Is there any documentation available on what the filter capabilities are of
> the different JDBC data stores, i.e. which functions/operators/etc. are
> supported for conversion to SQL expressions?
>
> This is quite important to know for people who design app-schema mapping
> files and filters, because it has a huge effect on performance. But with my
> recent joining performance increase tool in app-schema, it is also necessary
> to know this to get it actually to work, because the expressions used for
> linking features together need to be supported by the filter capabilities to
> be able to translate it to join statements.
>
> Regards
> --
> Niels Charlier
>
> Software Engineer
> CSIRO Earth Science and Resource Engineering
> Phone: +61 8 6436 8914
>
> Australian Resources Research Centre
> 26 Dick Perry Avenue, Kensington WA 6151
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