Re: Re: Support plpgsql multi-range in conditional control
| От | Pavel Stehule |
|---|---|
| Тема | Re: Re: Support plpgsql multi-range in conditional control |
| Дата | |
| Msg-id | CAFj8pRBKxS0LQePGT5n-5RK3A0eMAqFMimHMgDdSU4HdP8Ufqw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Re: Support plpgsql multi-range in conditional control (Pavel Stehule <pavel.stehule@gmail.com>) |
| Список | pgsql-hackers |
čt 19. 1. 2023 v 16:54 odesílatel Pavel Stehule <pavel.stehule@gmail.com> napsal:
Hello, thank you very much for your reply. But I think you may have misunderstood what we have done.What we do this time is that we can use multiple range ranges (condition_iterator) after in. Previously, we can only use such an interval [lower, upper] after in, but in some scenarios, we may need a list: condition_ iterator[,condition_iterator ...]condition_iterator:[ REVERSE ] expression .. expression [ BY expression ]then you can use second outer for over an array or just while cycle
I wrote simple example:
create type range_expr as (r int4range, s int);
$$
declare re range_expr;
begin
foreach re in array ARRAY[('[10, 20]', 1), ('[100, 200]', 10)]
loop
for i in lower(re.r) .. upper(re.r) by re.s
loop
raise notice '%', i;
end loop;
end loop;
end;
$$;
declare re range_expr;
begin
foreach re in array ARRAY[('[10, 20]', 1), ('[100, 200]', 10)]
loop
for i in lower(re.r) .. upper(re.r) by re.s
loop
raise notice '%', i;
end loop;
end loop;
end;
$$;
But just I don't know what is wrong on
begin
for i in 10..20
loop
raise notice '%', i;
end loop;
for i in 100 .. 200 by 10
loop
raise notice '%', i;
end loop;
end;
and if there are some longer bodies you should use function or procedure. Any different cycle is separated. PLpgSQL (like PL/SQL or ADA) are verbose languages. There is no goal to have short, heavy code.
Regards
Pavel
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