Would probably be best to change the input data the
user is entering (seems to be a webpage yes?) to the format YYYY-MM-DD, and
don't cast the timestamp value in the where clause. Also, note that your create
table statement lists your table name as "ValueLog" - try and make sure that you
aren't having case problems. You may need to enclose the table name in double
quotes to keep the case on the query. Also, with your test query where you are
selecing just that field, take the table name off of the field, and also try and
run a "SELECT COUNT(*) FROM ValueLog" to make sure that you have records to
return.
Beware also that you aren't connecting to a separate
server that has the schema but no data on your connection where you are issuing
the query.
Jason Minion
From: pgsql-php-owner@xxxxxxxxxxxxxx
[mailto:pgsql-php-owner@xxxxxxxxxxxxxx] On Behalf Of Rodrigo
Llanos
Sent: Tuesday, February 28, 2006 1:51 PM
To:
pgsql-php@xxxxxxxxxxxxxx
Subject: Re: [PHP] selecting records by
timestamp (date)
On 2/28/06, Jovan
Kostovski <chom_devel@xxxxxxxxx> wrote:
Hi,
I have the following table running on postgres 8.04:
CREATE TABLE ValueLog
(
idValueLog int4 NOT NULL DEFAULT nextval ('public.idValueLog_seq'::text),
PPx integer,
iValue integer DEFAULT -1,
fValue real DEFAULT -1,
t_tag timestamp without time zone,
t_arr timestamp without time zone,
cot integer,
ack boolean,
blk boolean,
qd_iv boolean,
qd_nt boolean,
qd_sb boolean,
qd_bl boolean,
qd_ov boolean,
CONSTR AINT idValueLog PRIMARY KEY (idValueLog)
)
WITHOUT OIDS;
ALTER TABLE ValueLog OWNER TO $admin_user;"
I've created the following SQL statement to select the records newer then a given date:
select almvalue.almname , ppoint.ppdimstr, valuelog.ack, valuelog.blk, to_char(valuelog.t_arr,'DD.MM.YYYY HH24:MI:SS') from ppoint, valuelog, almvalue where ppoint.ppx = valuelog.ppx and almvalue.almvalue = valuelog.ivalue and valuelog.ppx = $db_ppx and to_char(valuelog.t_arr,'YYYYMMDD') >= '$ts
$ts is a string, the date value input by the user and formated YYYYMMDD
I've developed the web site on my Ubuntu box, but when I uploaded the site on the server Fedora Core 3, I had problems with the date filtering. Running psql on the server I've noticed that there were more data in the select * from value log results, field t_arr something like MM-DD-YYYY-dsfsdfd (something else which I don't know what it is)
I think that the local time settings on the server makes me the troubles.
What's the solution?
I've even checked the result of:
select to_char( valuelog.t_arr,'DD.MM.YYYY HH24:MI:SS') from valuelog;
but instead of data I got empty data set. Why?
What's the best way to do filtering (selecting) data by time?
TIA, Jovan
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Saludos.
