It is highly recommended that you use MySqli extension of PHP instead MySql as in near future it will be deprecated from PHP. It is more secure, reliable and object oriented.
Following are some useful links which will give you jumpstart on MySqli:
Overview
http://www.php.net/manual/en/mysqli.overview.php
Prepare statement example
http://www.php.net/manual/en/mysqli-stmt.affected-rows.php
Multi-query example
http://www.php.net/manual/en/mysqli.multi-query.php
Enjoy your new DB classes.