Re: [JDBC] Regarding GSoc Application

On Mon, Apr 9, 2012 at 11:55 AM, Merlin Moncure <mmoncure@gmail.com> wrote:
> On Mon, Apr 9, 2012 at 10:47 AM, Dave Cramer <pg@fastcrypt.com> wrote:
>> How will the user access this? Will it be a normal query through the
>> existing API ? Will it be a private postgresql API ?
>>
>> How will they set it up ? It appears complicated as you have to setup
>> PL/Java as well
>
> Yeah -- it will run through pl/java (at least, that's the idea). What
> pl/java brings to the table is well thought out integration of the JVM
> to postgres so that you can invoke java as functions from postgres.
> PL/java of course is a heavy dependency and non-trivial to set up and
> install.  But to access the jdbc from postgres I think it's the
> easiest way forward.  Straight JNI to the JVM from FDW might be a
> better/cleaner route but we haven't done the research to see exactly
> what's involved there.  I suspect that invoking java from postgres is
> non trivial any way you slice it and that's not a wheel worth
> re-inventing.
>
> In other words, the basic idea is to do two things: a dblink-ish
> wrapper for JDBC via pl/java and a FDW wrapper through that via SPI.
> Better ideas and criticism are welcome of course.
>
> merlin

So I'm confused, once they link a file to an FDW can't you just read
it with an normal select ?

What additional functionality will this provide ?

Dave