#45834 [NEW]: INSERT INTO t VALUES (...) ON DUPLICATE KEY UPDATE ... and mysql_insert_id()

From:             swadlern at op dot pl
Operating system: Mandriva Linux 2008.1 x86_64
PHP version:      5.2.6
PHP Bug Type:     MySQL related
Bug description:  INSERT INTO t VALUES (...) ON DUPLICATE KEY UPDATE ... and mysql_insert_id()

Description:
------------
I execute the following query:

INSERT INTO test VALUES (NULL,'key','value') ON DUPLICATE KEY UPDATE
v='value';

key exists and value of v column is the same as new value in UPDATE
clause.
I call $id=mysql_insert_id(); and expect that $id is id of existing row
(id is INT NOT NULL PRIMARY KEY AUTO_INCREMENT column) but $id contains
another value.

MySQL version is 5.0.51a

Reproduce code:
---------------
<?php
/* MySQL table definition
CREATE TABLE test
(
    id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    k VARCHAR(10) NOT NULL UNIQUE,
    v VARCHAR(10) NOT NULL
);
*/

$db_host='localhost'; //database host
$db_user=''; //database user
$db_pass=''; //database password
$db_name='test'; //database name

mysql_connect($db_host,$db_user,$db_pass); //connect to database
mysql_query("USE $db_name"); //select database
mysql_query('TRUNCATE test'); //clear test table
mysql_query('INSERT INTO test VALUES (NULL,\'key\',\'value\')');
mysql_query('INSERT INTO test VALUES (NULL,\'key\',\'value\') ON DUPLICATE
KEY UPDATE v=\'value\'');
$id=mysql_insert_id();
mysql_close();
echo("Expected id is 1, id is $id\n");
?>


Expected result:
----------------
I expect $id to be 1

Actual result:
--------------
$id is 2

-- 
Edit bug report at http://bugs.php.net/?id=45834&edit=1
-- 
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45834&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45834&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45834&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=45834&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=45834&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=45834&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=45834&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=45834&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=45834&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=45834&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=45834&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=45834&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=45834&r=globals
PHP 4 support discontinued:   http://bugs.php.net/fix.php?id=45834&r=php4
Daylight Savings:             http://bugs.php.net/fix.php?id=45834&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=45834&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=45834&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=45834&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=45834&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=45834&r=mysqlcfg