RE: [PHP-DB] finding ID's
Hi Jon Try using something like $getlist = mysql_query(SELECT id FROM yourdb,$dbconnectetc); $numrows = mysql_num_rows($getlist); echo $numrows\n; This will give you the number of records in your db. If you use autoincrement for the id field your will not have to worry about your ++. If you delete any records numrows will always be correct. HTH Howard First off, sorry for the newbie question... :(. I want to be able to query the database and find the record with the highest ID value. Example... each row ideally has an incremented integer ID (1, 2, 3, 4...) but I am running into problems when I try and delete a row (let's say row 2). My PHP currently selects all of the rows and formulates the ID off of that... This I found out is bad because when I delete row 2 the query says there are 3 rows so my PHP will try to make the ID = 4. I just need the code to find the highest ID so I can ++ it. Sorry again for the easy question! -Jon Gales http://www.macmerc.com -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] finding ID's
Hi Jon, and Howard, (comments interposed, below) Try using something like $getlist = mysql_query(SELECT id FROM yourdb,$dbconnectetc); $numrows = mysql_num_rows($getlist); echo $numrows\n; This will give you the number of records in your db. If you use autoincrement for the id field your will not have to worry about your ++. If you delete any records numrows will always be correct. =this is correct, but COUNT(*) is optimised/more efficient (RTFM: 6.3.7 Functions for Use with GROUP BY Clauses) First off, sorry for the newbie question... :(. I want to be able to query the database and find the record with the highest ID value. Example... each row ideally has an incremented integer ID (1, 2, 3, 4...) but I am running into problems when I try and delete a row (let's say row 2). My PHP currently selects all of the rows and formulates the ID off of that... This I found out is bad because when I delete row 2 the query says there are 3 rows so my PHP will try to make the ID = 4. I just need the code to find the highest ID so I can ++ it. Sorry again for the easy question! =no need to apologise, we all have to start somewhere. =It is an FAQ. By asking it you indicate that you don't (yet) understand the philosophy of the AUTO_INCREMENT facility. It is there to provide an ID for new rows of data, not to be a 'count' of the rows. If you consider that this ID may be used as a key into this table's data from another table (foreign key), then you will realise that changing ID values to reflect intermediate deletions is less than logical. (RTFM: 3.5.9 Using AUTO_INCREMENT, although it doesn't seem to get into this point - the annotated comments are worth a read though). I've just a had a quick look to see where the manual discusses the 'philosophy' and have come up empty - perhaps someone else can steer you right, if you need more. =It is worth reading through PHP's large collection of built-in MySQL_ functions. There are specific functions that will return various 'numbers of rows' to the script to suit various situations. =Regards, =dn =Regards, =dn -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Session End
Hi, I want to know if there is a way in PHP to sence that the visitor left the site, I think the answer is in PHP-Sessions, but I don't know how, Any help please?? Best Regards Hayan -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Session End
I want to know if there is a way in PHP to sence that the visitor left the site, I think the answer is in PHP-Sessions, but I don't know how, Any help please?? Use cookies. http://www.php.net/manual/en/features.cookies.php Greg Donald - http://destiney.com/ http://phprated.com/ | http://phplinks.org/ | http://phptopsites.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Beginner query about mysql...
I have a table with a ID field 'auto_increment', when i insert a record in the table, how can i know the value of the ID inserted by the mySQL? Thank's, Michele. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Beginner query about mysql...
The manual is at http://www.php.net/manual/en The function you need is mysql_insert_id. On Mon, 18 Feb 2002, michele wrote: I have a table with a ID field 'auto_increment', when i insert a record in the table, how can i know the value of the ID inserted by the mySQL? Thank's, Michele. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Session confusion :-(
are you always refreshing the session on each page dave?
i am pretty sure you need to call session_start() on every page that you
will be accessing the session-based variables.
HTH
beau
// -Original Message-
// From: Dave Carrera [mailto:[EMAIL PROTECTED]]
// Sent: Saturday, 16 February 2002 10:56 PM
// To: php List
// Subject: [PHP-DB] Session confusion :-(
//
//
// Hi All
//
// I am send variable values via set links i.e.:
//
// http://domian_name.com/page.php?category=1
//
// http://domian_name.com/page.php?category=2
//
// http://domian_name.com/page.php?category=3
//
// Etc etc
//
// The value is sent to a session. THIS WORKS BUT.
//
// If I click on the first link session variable category is set to 1.
//
// But if I then click on the send , third, forth or whatever link
// Session variable is still set to 1.
//
// I have tried
//
// If(ISSET($category)){
// Unset($category);
// Session_register(category) // hoping it would accept the new
// sent value.
// }
//
// No Go
//
// Can anyone throw some light on this please.
//
// As Always I am grateful for any pointers or exampled help
//
// :-)
//
// Dave Carrera
// Php / MySql Development
// Web Design
// Site Marketing
// http://www.davecarrera.com
//
//
//
//
// --
// PHP Database Mailing List (http://www.php.net/)
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//
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[PHP-DB] HELP: php4.1.1, oci8 functions, Oracle 9i and VARCHAR2 selects not working
Hi All, I have seen a lot of discussion about this - but no real solutions :) I am getting a two task communication error whenever I try to select a varchar2 element in a query in php4. I seem to be able to select any other kinds of data without hassle. All of my environment variables are set correctly, and I have experimented at length with different NLS_LANG values. The client machine is Mandrake Linux, running php 4.1.1 with oracle and oci8 support compiled in. SQL*Net is able to query the remote db server without any problems at all. Has *anyone* got any experience with Oracle9i and PHP that might be able to help? I would rather use MySQL in a heartbeat, but Oracle9i is a client requirement. Cheers, Brad -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Updating Database at a specified time
Would someone please help? I have looked everywhere and can not find how to
update a database at a certain time.
I am trying to get this to update at midnight instead of every time the
browser refreshes. My hosting service has cron jobs
but I don't understand how to set them up. Is there a way to set this code
up to do what I need?
?php
global $session;
$db[points]=(UPDATE wt_users set points = points + 1000 WHERE
uid={$session[uid]});
$result=mysql_query($db[points]);
$query=SELECT points FROM wt_users WHERE uid={$session[uid]};
$ret = mysql_query($query);
while(list($points)=
mysql_fetch_row($ret))
print(SP: $points);
?
Thanks in advance!
Jennifer Downey
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[PHP-DB] HELP: php4.1.1, oci8 functions, Oracle 9i and VARCHAR2 selects not working
Hi All, I have seen a lot of discussion about this - but no real solutions :) I am getting a two task communication error whenever I try to select a varchar2 element in a query in php4. I seem to be able to select any other kinds of data without hassle. All of my environment variables are set correctly, and I have experimented at length with different NLS_LANG values. The client machine is Mandrake Linux, running php 4.1.1 with oracle and oci8 support compiled in. SQL*Net is able to query the remote db server without any problems at all. Has *anyone* got any experience with Oracle9i and PHP that might be able to help? I would rather use MySQL in a heartbeat, but Oracle9i is a client requirement. Cheers, Brad -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
