Re: pgsql bug found?

On Dec 4, 2006, at 23:52 , Ronin wrote:

> Hi when I do the following function it fills 2 dates per day from 1970
> to 2050, except that some months (typical 2 months per year) have 4
> dates for one day. this is totally freaky.. I wonder if postgresql is
> tripping over itself making a double entry every now and again.
>
> for instance I constantly get the following entries
>
> "2006-10-01 00:00:00"
> "2006-10-01 23:59:59.999"
> "2006-10-01 00:00:00"
> "2006-10-01 23:59:59.999"
>
> Any ideas?
>
> Here the function
>
> DECLARE
> yearcnt integer;
> monthcnt integer;
> daycnt integer;
>
> BEGIN
>
> FOR yearcnt IN 1970..2050 LOOP
> monthcnt=1;
> FOR monthcnt IN 1..12 LOOP
> daycnt = 1;
> FOR daycnt IN 1..31 LOOP
> insert into datepool values
> (to_timestamp(yearcnt||'-'||to_char(monthcnt,'FM00')||'-'||to_char
> (daycnt,'FM09')||'
> 00:00:00.000','YYYY MM DD HH24:MI:SS.MS'));
>
> insert into datepool values
> (to_timestamp(yearcnt||'-'||to_char(monthcnt,'FM00')||'-'||to_char
> (daycnt,'FM09')||'
> 23:59:59.999','YYYY MM DD HH24:MI:SS.MS'));
>
>
> END LOOP;
> END LOOP;
> END LOOP;
>
> return;
>
> END;

I think both Martijn and Csaba have the right idea. Here's an
alternative that should work around those issues:

create table datepool(pool_ts timestamp primary key);

create function fill_date_range(start_date date, end_date date)
returns void
language plpgsql as $func$
declare
this_date date;
begin
this_date := start_date;
loop
insert into datepool(pool_ts) values (this_date);
insert into datepool(pool_ts) values ((this_date +
1)::timestamp - interval '.001 second');
exit when this_date >= end_date;
this_date := this_date + 1;
end loop;
return;
end;
$func$;

select fill_date_range('1970-01-01','2050-12-31');

# select * from datepool where pool_ts >= '2006-10-01' limit 10;
pool_ts
-------------------------
2006-10-01 00:00:00
2006-10-01 23:59:59.999
2006-10-02 00:00:00
2006-10-02 23:59:59.999
2006-10-03 00:00:00
2006-10-03 23:59:59.999
2006-10-04 00:00:00
2006-10-04 23:59:59.999
2006-10-05 00:00:00
2006-10-05 23:59:59.999
(10 rows)

Hope that helps.

Michael Glaesemann
grzm seespotcode net