2009/8/15 Dimitri Fontaine <dfontaine@hi-media.com>:
> Hi,
>
> Le 10 août 09 à 17:19, Andrew Dunstan a écrit :
>>
>> One fairly simple way would use a new SQL verb (say, DO) like this:
>>
>> DO $$ something in plfoo$ $ LANGUAGE plfoo;
>>
>> We could even default the langauge to plpgsql, for which you would then
>> just need:
>>
>> DO $$ something in plpgsql $$;
>
> That would also be a nice feature to rely on in extensions install.sql files
> when you have major version dependant code. Defining a function, calling it
> then removing it is what to do now. This new syntax would greatly simplify
> the support code.
>
> DO $$
> IF postgresql_major_version = '8.2'
> THEN
> ...
>
> ELSE
> ...
>
> END IF;
> $$;
why we need DO statement? Why not just $$ $$. Only string literal
cannot be statement too, so DO is unnecessary.
it can look like:
$$ FOR r IN SELECT .... END LOOP;
$$;
???
>
> (of course in this snippet example the ELSE covers it because the CREATE
> EXTENSION stuff declared e.g. dependancy on postgresql >= 8.2).
>
> Regards,
> --
> dim
>
>
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