打开两个唯一的mysql连接？

Question

I have two separate databases and I want to open a connection to both of them at the same time, they both have the same login details so I used the fourth parameter in the mysql_connect function so I could use both.

As such..

$db1 = mysql_connect('host','user','pass',true);
mysql_select_db('db1', $db1);
$db2 = mysql_connect('host','user','pass',true);
mysql_select_db('db2', $db2);

When I use the $db1 resource in a mysql_query it works fine, however when I use $db2 it still tries to use the db1 database.

I know I can reference databases such as db.table but just wondering why this doesn't work?

Answer 1

If you don't provide an argument for the new_link parameter, an existing link will be returned; however, if you do but SQL safe mode is enabled, then it is ignored:

bool new_link

If a second call is made to mysql_connect() with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned. The new_link parameter modifies this behavior and makes mysql_connect() always open a new link, even if mysql_connect() was called before with the same parameters.

In SQL safe mode , this parameter is ignored.

This could be the case.