Saturday, March 24, 2012

Multiple database connection on same credentials

If you are opening two separate connections to two different databases (but on the same host, and with the same user and password):
$db1 = mysql_connect($dbhost, $dbuser, $dbpass);
$rv = mysql_select_db($dbname1, $db1);
$db2 = mysql_connect($dbhost, $dbuser, $dbpass);
$rv = mysql_select_db($dbname2, $db2);

At this point, both $db1 and $db2 will have selected the database named by $dbname2.
The workaround is to require that the second MySQL connection is new:
$db1 = mysql_connect($dbhost, $dbuser, $dbpass);
$rv = mysql_select_db($dbname1, $db1);
$db2 = mysql_connect($dbhost, $dbuser, $dbpass, TRUE);
$rv = mysql_select_db($dbname2, $db2);

Now, $db1 should have selected $dbname1, and $db2 should have selected $dbname2.
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