RE: multiple queries, one transaction - REWORDED

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I have a scenario where I have multiple inserts into a table and need to
know that ALL inserts were successful and if not that there were no
inserts.

I've seen an article on transactions in php/mysql and have a few
questions.

I have a table with orderID, itemIDs and itemQty

Someone with an orderID of 789 may want to purchase itemID 1 and itemID
2 and item 3. At purchase I give the customer a final shot of changing
his mind. (While shopping he puts the items into a session variables,
now that he's in the process of purchasing its in a database.)

Say he want to remove itemID 1.

The solution I've been using is to 

DELETE FROM purchaseItems
WHERE orderID = '789'

Now I have to reinsert.

<LOOP>

INSERT INTO purchaseItems
...

</LOOP>

These multiple queries (DELETE and INSERTS) should be considered one
transaction so that if one query fails, they all do. 

Thx, mayo









-----Original Message-----
From: Miguel Guirao [mailto:miguel.guirao@xxxxxxxxxxxxxxx] 
Sent: Tuesday, May 17, 2005 7:41 PM
To: mayo; php-db@xxxxxxxxxxxxx
Subject: RE:  multiple queries, one transaction

There is a function that gets the last auto increment value for an ID
field!!

-----Original Message-----
From: mayo [mailto:mayo@xxxxxxxxxxxxxxxxxx]
Sent: Martes, 17 de Mayo de 2005 10:27 a.m.
To: php-db@xxxxxxxxxxxxx
Subject:  multiple queries, one transaction


I would like to get the itemID number (autoincrement) of the last
insert.

(Insert order, get last orderID number and use it elsewhere.)

I'm having trouble understanding how to do a transaction in mysql/php

Code below:



$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die
('Error connecting to mysql');

$dbname = 'mail';

mysql_query("BEGIN"); // starts the transaction

mysql_query($query) or die('Error, insert query failed');
mysql_query($query2) or die('Error, select query failed');


$query = "INSERT INTO orders (orderDate) VALUES ('2005-05-17')";
$query = "SELECT max ordered FROM orders";

mysql_query($query) or die('Error, insert query failed');
mysql_query($query2) or die('Error, update query failed');


mysql_query("COMMIT"); // ends the transaction

mysql_close($conn);
?>

thx

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