Consider following tutorials on JDBC
http://www.cs.unc.edu/Courses/wwwp-s98/members/thornett/jdbc/
http://www.cs.unc.edu/Courses/wwwp-s98/members/thornett/jdbc/183.html
http://www-db.stanford.edu/~ullman/fcdb/oracle/or-jdbc.html
http://java.sun.com/developer/Books/JDBCTutorial/
Sample Code : Code 1 / Code 2