On Thu, Mar 12, 2015 at 1:15 AM, Martin Davis <[email protected]> wrote:
> Uuuh... the result might become very confusing... in the simple case you
>> might want to just change a function call,
>> in the complex one you might have to rewrite half of the query.
>>
>
> Well, let's not let the best be the enemy of the good. I'd be happy if
> the "simple" case was handled.
>
So I've been talking about this with Jody, and he's been pretty horrified
about what I proposed, but
here it goes anyways: it seems to me that what you are looking for is some
sort of templating language
to write a query.
Right now parametric queries are sort of our templating language, but to do
what you want you
need control structures that would emit different sql bits depending on the
zoom level... so
it seems to me that what you want is a freemarker template for sqlviews...
and it would be up
to you to make sure that whatever you write always returns the same
_structure_, the same
attribute names and types.
There are of course ugly sides to this:
* We'd need to add a relatively large dependency to gt-jdbc (freemarker, if
we care for consistency
with what is alread in use in GeoServer) since the sql expansion is done
there
* We'd need to start passing in a set of "well known" variables to it,
bbox, current zoom level, target
pixel size, and so on
> * Checking that the template would not result in something easy to attack
with sql injection would
be hard
But it seems it would satisfy all your needs, and more
Cheers
Andrea
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