Query problems with PostgreSQL

[webhead74]

Hi,

I'm having intermittent problems with queries from my php script to a
postgresql database.

I have a form where I can enter a search query - for instance a last
name. This leads to a results page with a brief bit of information
about each of the matching results. From there, I can click a link
associated with any of the results which takes me to a page with all of
the details. Pretty standard stuff.

Problem I'm having is that for some of the results, when I click the
link to go to the full details page, no information is returned by the
script. I basically end up with my html template & no data populated.
For the majority of items, things work just fine.

One thing I've noticed is that it seems to be reproducable - that is,
for example item 5123 always fails to return any results on the full
details page.

>From my Postgres box (windows 2003), I can run the exact same query as

from my PHP script (with item id 5123) & it returns the data.

So what could the problem possibly be?

I thought that perhaps it was a load issue on the server - couldn't
answer the query, but the fact that it's reproducible seems to nix that
idea. Also, that Postgres box has 3.5 GB of RAM & we're talking about
a test system at this point - I'm the only one using it.

Code for my first search results page (basic info & hyperlinks) looks
like this ($name_last is the variable passed from the search form):

$connection=pg_ connect("host=1 0.10.10.2 port=5432 dbname=db1
user=dbuser password=passwo rd");

$myresult = pg_exec($connec tion, "SELECT identification_ no, name_last
, name_first, name_middle FROM public.j_identi fication WHERE name_last
~*
'$name_last'");
The code for my detailed results page looks like this:

$connection = pg_connect("hos t=10.10.10.2 port=5432 dbname=db1
user=dbuser password=passwo rd");

$myresult = pg_exec($connec tion, "SELECT * FROM
public.archived _with_photos
WHERE identification_ no = '$id_no'");
'public.archive d_with_photos' is a view defined on the postgresql
server.

I can run the query

SELECT * FROM public.archived _with_photos WHERE identification_ no =
'5123';

and it returns all of the associated data from the database... whereby
the exact same query failed with the PHP script.

Any help or ideas greatly appreciated!

[Erwin Moller]

webhead74 wrote:

Hi,

I'm having intermittent problems with queries from my php script to a
postgresql database.

I have a form where I can enter a search query - for instance a last
name. This leads to a results page with a brief bit of information
about each of the matching results. From there, I can click a link
associated with any of the results which takes me to a page with all of
the details. Pretty standard stuff.

Problem I'm having is that for some of the results, when I click the
link to go to the full details page, no information is returned by the
script. I basically end up with my html template & no data populated.
For the majority of items, things work just fine.

One thing I've noticed is that it seems to be reproducable - that is,
for example item 5123 always fails to return any results on the full
details page.

>>From my Postgres box (windows 2003), I can run the exact same query as

from my PHP script (with item id 5123) & it returns the data.

So what could the problem possibly be?

I thought that perhaps it was a load issue on the server - couldn't
answer the query, but the fact that it's reproducible seems to nix that
idea. Also, that Postgres box has 3.5 GB of RAM & we're talking about
a test system at this point - I'm the only one using it.

Code for my first search results page (basic info & hyperlinks) looks
like this ($name_last is the variable passed from the search form):

$connection=pg_ connect("host=1 0.10.10.2 port=5432 dbname=db1
user=dbuser password=passwo rd");

$myresult = pg_exec($connec tion, "SELECT identification_ no, name_last
, name_first, name_middle FROM public.j_identi fication WHERE name_last
~*
'$name_last'");
The code for my detailed results page looks like this:

$connection = pg_connect("hos t=10.10.10.2 port=5432 dbname=db1
user=dbuser password=passwo rd");

$myresult = pg_exec($connec tion, "SELECT * FROM
public.archived _with_photos
WHERE identification_ no = '$id_no'");
'public.archive d_with_photos' is a view defined on the postgresql
server.

I can run the query

SELECT * FROM public.archived _with_photos WHERE identification_ no =
'5123';

and it returns all of the associated data from the database... whereby
the exact same query failed with the PHP script.

Any help or ideas greatly appreciated!

Strange.
I cannot imagine Postrgres will have problems with a certain
identification_ no.
It must be something else.
Did you turn on ALL errorreporting?
And what does $myresult contain?

Also pg_exec is very old. Avoid it.
php.net doesn't even list it anymore...
Start using pg_query instead.

Regards,
Erwin Moller

[Toby Inkster]

webhead74 wrote:

$myresult = pg_exec($connec tion, "SELECT * FROM
public.archived _with_photos
WHERE identification_ no = '$id_no'");

Could be something funny going on with the variable interpolation. Try:

$myquery = "SELECT *
FROM public.archived _with_photos
WHERE identification_ no = '$id_no'";
$myresult = pg_query($conne ction, $query);
var_dump(array( 'Q'=>$query, 'R'=>$myresult) );

Does the var_dump reveal the query you expected?

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact