PHP : substitute to wpdb class in wordpress
https://stackoverflow.com/questions/2542926
Solution
As Wordpress is developped using PHP, I suppose you could use any PHP functions/classes, as long as the corresponding extension is installed on your server.
See the Database Extensions section of the manual for a list of extensions that can be used to connect to different kinds of database systems.
If you are using MySQL, I would suggest the mysqli extension -- at least if installed on your server ; it's more recent, and support more features, than the old mysql one.
PDO can be a good choice too -- and works with both MySQL and other database systems.
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