On Friday, July 30, 2010 2:40 PM, Igor Tandetnik wrote:
> chris23879 <chris23879-qglwrmlu8clzjhtm8ag...@public.gmane.org> wrote:
>> I'm tring to create a paging function in sqlite. Is it possible to
>> declare
>> and use a variable in sqlite.
>
> No. But since SQLite is embedded in your application, you can use
> variables
> in your host programming language.
chris23879,
The suggestion by Igor is probably the best way if you can. In terms of
sheer performance and even simplicity, I would say almost certainly.
But sometime back in January I seem to remember someone posted a patch for a
sort-of procedural language addon for sqlite (it didn't do stored procedures
in the traditional sense per se, but otherwise it had some very nice
features!). I honestly can't remember too much right now except that I
downloaded it for curiosities sake, and it is certainly not supported by the
sqlite developers and I don't know its status now that 3.7.0 has come out
but if you're interested I can have a scan through my email logs and see
what I can find.
>From your email, it looks like you want a auto-counting row: using the
procedural language patch you'd then do an sql query something like:
execute using ( num := 0 ) begin
for cols[] in (select * from data) begin
set num := num+1;
select cols[*], num;
end;
end;
I've just checked this, and it seems to work ok. It looks a right pig on
paper, but it produces quite compact and relatively speedy vdbe code (which
is the important thing).
Anyway, if you wait long enough, I guess sqlite will one day support this
type of thing as standard. They've done foreign keys and wal recently - I
expect they're already looking to the next big feature to add!!!
Rgds, Andy
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