In the "JDBC Driver" combobox you can specify or choose from the list the name of a JDBC driver class, which you would like to be used to establish connection to a database.
DataMaster comes with a default JDBC Driver for MySQL (part of MySQL Connector/J 5.0, see http://dev.mysql.com/downloads/connector/j/5.0.html). The default database driver class called:
     com.mysql.jdbc.Driver
can always be selected, but you can specify or select also other JDBC Driver classes, which you have included in the Protégé class path.

Note: The most elegant way to include database drivers for DataMaster in your Protégé classpath is to place the .jar file containing your driver directly in the DataMaster plugin directory, located in
[PROTEGE_INSTALL_DIR]\plugins\edu.stanford.smi.protegex.datamaster
and restart Protégé.

If you are looking for a JDBC driver for your database search the website of the DBMS vendor or try the following link: http://developers.sun.com/product/jdbc/drivers

For convenience here is a list of example driver names for popular databases (if you encounter problems please follow the API documentation of the JDBC driver)

For more information please refer to http://protegewiki.stanford.edu/index.php/DataMaster