RE: [PHP] RE: non-auto increment question
Being rather new to all this, I understood from the MySql manual that the auto_increment is to b e used immediately after an insertion not intermittently. My application is for administrators (the site owner designates) to update the database from and administration directory, accessed by user/password login... so there's really very little possibility of 2 people accessing at the same time. By using MAX + 1 I keep the id number in the $idIn and can reuse it in other INSERTS -- The statement is confusing at best. For the casual user auto_increment is the way to do. I say for the casual user. That is typical me and you. Basically if you do an insert a unique value is inserted at the time of the insert. As mentioned, there are ways to get this value back in the return. Now why I say it's for the casual user is because if you are using triggers then you can do things prior to this value being used and then the statement above is correct. But you are not going to be using triggers... So, put an auto_increment on the key field and find one of the 2^16 samples of how this works with PHP. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] RE: non-auto increment question
Not sure that this is the problem BUT you should probably qualify the name of
the variable such that SELECT MAX(id) AS id FROM book. But you don't want
max(id) as id but rather max(id) + 1 as id. With that you can then just
return the final value. Also, if you don't want to alias the value (or
whatever it's called) you should use $row[0] to get it by ordinal posistion.
As for now wanting to use autoincrement, you can run into a race condition
where two people are inserting at the same time, thus having the same generated
id.
Hope that helps.
From: PJ [mailto:af.gour...@videotron.ca]
Sent: Wed 2/25/2009 2:01 PM
To: MySql; php-general@lists.php.net
Subject: non-auto increment question
I want to insert a new table entry 1 number higher than the highest in
the field (id). I cannot use auto-increment.
And I want to show the value of the field to be added in an input field
on the web page:
if (isset($_REQUEST[AddNewBooksRequest])) {
$SQL = SELECT MAX(id) FROM book;
$result = mysql_query($sql, $db);
$bookCount = mysql_num_rows($result);
for ($i=0; $i $bookCount; $i++) {
$row = mysql_fetch_array($result);
$idIN= $row[id]+1;
}
$idIN= $_POST[idIN];
$titleIN= $_POST[titleIN];
...snip...
td colspan=2
?
echo input type='text' name='titleIN' value='$idIN' disabled size='2';
?
/td
What am I doing wrong? (The query works and returns the right nr. but
what do I have to do to add 1 to that number and then display it in the
on page and post it to the table?
--
Phil Jourdan --- p...@ptahhotep.com
http://www.ptahhotep.com http://www.ptahhotep.com/
http://www.chiccantine.com http://www.chiccantine.com/
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