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
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