There are two supported JDBC drivers for MySQL:
MySQL Connector/J from MySQL AB, implemented in 100% native Java. This product was formerly known as the mm.mysql driver. You can download MySQL Connector/J from http://dev.mysql.com/downloads/connector/j/.
The Resin JDBC driver, which can be found at http://www.caucho.com/projects/jdbc-mysql/index.xtp.
For more information, consult any general JDBC documentation, plus each driver's own documentation for MySQL-specific features.
Documentation for MySQL Connector/J is available online at the MySQL AB Web site at http://dev.mysql.com/doc/.