Re: Re: Support plpgsql multi-range in conditional control
Hello, Pavel Stehule:
Thank you very much for your verification. The test cases you provided work well here:
For your second example, we can easily merge, as follows:
For scenarios that can be merged, we can choose to use this function to reduce code redundancy; If the operations performed in the loop are different, you can still select the previous use method, as follows:
In response to Tom's question about cursor and the case of in select: I don't actually allow such syntax here. The goal is simple: we only expand the range of integers after in, and other cases remain the same.
Thank you again for your ideas. Such a discussion is very meaningful!
songjinzhou(2903807914@qq.com)
From: Pavel StehuleDate: 2023-01-20 00:17CC: pgsql-hackersSubject: Re: Re: Support plpgsql multi-range in conditional controlčt 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 cycleI wrote simple example:create type range_expr as (r int4range, s int);do$$
declare re range_expr;
begin
foreach re in array ARRAY[('[10, 20]', 1), ('[100, 200]', 10)]
loop
for i in lower(re.r) .. upper(re.r) by re.s
loop
raise notice '%', i;
end loop;
end loop;
end;
$$;But just I don't know what is wrong onbeginfor i in 10..20loopraise notice '%', i;end loop;for i in 100 .. 200 by 10loopraise 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.RegardsPavel
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