Re: [PHP-DB] Newbie alert: supplied argument is not a valid MySQL result resource
Hi
On my way to bed so too tired too look closely, but at a guess I'd say
it's a logic error. I would guess this:
$sid = mysql_fetch_array($query) || die ('Could not fetch from database:
' . mysql_error()); // --- line 49
isn't evaluating in the order you expect.. You're using a logic
statement as an assignment, and the result of that get's assigned to your
variable not the resource you expect. Try it like this to see if it works:
$sid = mysql_fetch_array($query);
if ($sid === false) die ('Could not fetch from database: ' . mysql_error());
If that's not the problem, I haven't got a clue until after sleep and
coffee.
I've had some sleep, and coffee, and I see I missed something silly.
I should of suggested this
// get sid and write cookies
$query = mysql_query(SELECT MAX(SID) FROM Sessions);
if ($query === false) die ('Could not query database: ' . mysql_error());
$sid = mysql_fetch_array($query)
if ($sid === false) die ('Could not fetch from database: ' . mysql_error());
--
Niel Archer
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[PHP-DB] First and Last ID of a table
I have a table where I need to figure out the very first ID and the very last ID, so here is what I wrote: $first_query = SELECT id FROM mytable ORDER BY id LIMIT 1; $first_result = mysql_query($first_query,$con); $first_id = mysql_result($first_result,0,'id'); $last_query = SELECT id FROM mytable ORDER BY id DESC LIMIT 1; $last_result = mysql_query($last_query,$con); $last_id = mysql_result($last_result,0,'id'); I'm just wondering if there was any way to do this more efficiently, like with one query instead of two. Or is this about as simple as I can do it? Thanks. -- Kevin Murphy Webmaster: Information and Marketing Services Western Nevada College www.wnc.edu 775-445-3326
Re: [PHP-DB] First and Last ID of a table
SELECT MIN(id), MAX(id) FROM mytable :) Hope that helps! -TG = = = Original message = = = I have a table where I need to figure out the very first ID and the very last ID, so here is what I wrote: $first_query = SELECT id FROM mytable ORDER BY id LIMIT 1; $first_result = mysql_query($first_query,$con); $first_id = mysql_result($first_result,0,'id'); $last_query = SELECT id FROM mytable ORDER BY id DESC LIMIT 1; $last_result = mysql_query($last_query,$con); $last_id = mysql_result($last_result,0,'id'); I'm just wondering if there was any way to do this more efficiently, like with one query instead of two. Or is this about as simple as I can do it? Thanks. -- Kevin Murphy Webmaster: Information and Marketing Services Western Nevada College www.wnc.edu 775-445-3326 ___ Sent by ePrompter, the premier email notification software. Free download at http://www.ePrompter.com. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Newbie alert: supplied argument is not a valid MySQL result resource
lameck kassana [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
hey just make this
$sid = mysql_fetch_array($query) or die ('Could not fetch from database:
' . mysql_error().);
try this
Yep. I figured that out yesterday. Hit the nail right on the head. As
I've learned from experimentation, the pipe operator takes precedence to the
assignment operator so I was basically evaluating whether my query or a die
statement returned a true value (which the query statement was, so it never
processed the die()) and then assigning true, or 1 to $query. The 'or'
operator by contrast processes after the assignment, so the following line:
$query = mysql_query(some SQL) or die();
first assigns a handle to $query (assuming the query is valid, which in my
case it was) and then evaluated the value of query. This leaves me with two
remaining questions. I'm coming from a Perl background, so I'm wondering if
there's a documentation page somewhere for PHP operators (something along
the likes of perlop) and as an experiment I tried the following code, and it
behaved exactly like the code I first posted, which I'm not sure why:
($query = mysql_query(valid SQL)) || die();
Shouldn't everything within the first set of parentheses here evaluate as
the first || condition?
Thanks for everyone's help,
Matt
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Re: [PHP-DB] First and Last ID of a table
[EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] SELECT MIN(id), MAX(id) FROM mytable As an aside, is you are using associative arrays, be sure to use the following keys: $array['MIN(id)'] and $array['MAX(id)'] Just something I figured out recently :) Matt -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] First and Last ID of a table
Sounds about right... you can also do something like this (syntax should be right): SELECT MIN(id) as minid, MAX(id) as maxid FROM mytable $array['minid'] and $array['maxid'] Basically it's going to be whatever the heading of that column is. Using as gives it an alias for less ugly headings. If you did SELECT COUNT(Qty) FROM SomeTable Then you might get: $array['Count of Qty'] or something goofy like that. I forget the exact circumstances but there's times you get goofy stuff like that. If you run the SQL through some DB client (like mysql's command line stuff or I use WinSQL Lite in Windows to connect to our MySQL database across the network) you can usually see what the heading name is going to end up being, if you don't explicitly set it with an AS clause. AS also works on table names: SELECT l.LeadID, ld.FirstName FROM Leads as l, LeadData as ld WHERE l.LeadID = ld.LeadID (actually a lot of the time you can leave out the as and just do Leads l) Fun times.. -TG = = = Original message = = = [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] SELECT MIN(id), MAX(id) FROM mytable As an aside, is you are using associative arrays, be sure to use the following keys: $array['MIN(id)'] and $array['MAX(id)'] Just something I figured out recently :) Matt -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php ___ Sent by ePrompter, the premier email notification software. Free download at http://www.ePrompter.com. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] First and Last ID of a table
On Wed, 11 Jul 2007, Matt Leonhardt wrote: [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] SELECT MIN(id), MAX(id) FROM mytable As an aside, is you are using associative arrays, be sure to use the following keys: $array['MIN(id)'] and $array['MAX(id)'] Just something I figured out recently :) or use select min(id) min, max(id) max from mytable then access as $array['min'] and $array['max'] --- Peter Beckman Internet Guy [EMAIL PROTECTED] http://www.angryox.com/ --- ** PLEASE NOTE PurpleCow.com IS NOW AngryOx.com DO NOT USE PurpleCow.com ** ** PurpleCow.com is now owned by City Auto Credit LLC as of May 23, 2007 ** --- -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
