Takes the value of the DriverNameString and
issues a Class.forName request to load the named class. The class is
expected to be a JDBC driver that registers itself with java.sql.DriverManager.
If
the Driver command
succeeds, a new ij prompt appears for the next command.
Exampleij> -- load the driver so that a connection
-- can be made:
driver 'org.apache.derby.jdbc.EmbeddedDriver';
ij> connect 'jdbc:derby:menuDB;create=true';
ij>