From: JULES at SITEPOINT dot COM
Operating system: RH linux 2.4.18
PHP version: 4.3.0
PHP Bug Type: MySQL related
Bug description: Simultaneous connections with same user/password do not work.
When making two simultaneous connections to a MySQL server using the same
username / password combination, the MySQL link resource returned is the
same. The upshot of this is that I am unable to use these 2 connections
to simultaneously work with 2 different databases that happen to share one
user/pass set.
Put simply: If I call mysql_select_db() on one connection, it changes the
selected DB on the other connection, too. The following code illustrates
the sharing of the connection by executing a bogus query on one connection
then calling mysql_error() on both connections.
<?
$conn1 = mysql_connect ("localhost", "sales", "xxxx");
$conn2 = mysql_connect ("localhost", "sales", "xxxx");
mysql_select_db("sales", $conn1);
mysql_select_db("salesNEW", $conn2);
mysql_query("SELECT blah FROM blah", $conn1);
echo mysql_error($conn1)."<br />";
echo mysql_error($conn2);
echo "<br /><br />";
echo $conn1."<br />";
echo $conn2;
?>
The output is:
Table 'salesNEW.blah' doesn't exist
Table 'salesNEW.blah' doesn't exist
Resource id #2
Resource id #2
Notice that I'm executing the broken query on $conn1. Yet the error
message is returned on both $conn1 and $conn2. Also notice that the
Resource id's are both 2, which easily explains this behavior.
It gets more bizarre when I swap over to mysql_pconnect(). The output
becomes:
Table 'salesNEW.blah' doesn't exist
Table 'salesNEW.blah' doesn't exist
Resource id #2
Resource id #3
So the behaviour is the same, but PHP clearly thinks it has 2 seperate
connections this time.
To determine whether PHP or MySQL was causing this bug, I used 2
simultaneous instances of the mysql command line client and verified that
it happily coped with the situation.
--
Edit bug report at http://bugs.php.net/?id=22654&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=22654&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=22654&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=22654&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=22654&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=22654&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=22654&r=support
Expected behavior: http://bugs.php.net/fix.php?id=22654&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=22654&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=22654&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=22654&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=22654&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=22654&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=22654&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=22654&r=gnused
