The documentation of the specific RDBMS / driver would be a good place to start.
If the driver is JDBC 4 compatible there's no need to load it via a Class.forName() anymore, though. A JDBC 4 compatible driver should have a file java.sql.Driver file located in the META-INF/services folder of the JDBC driver JAR file, which contains the FQN of the driver class.
Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life.