oh well... do not get confused with all that! these are very simple and easy to learn, so just follow the link given below

http://www.roseindia.net/jdbc/jdbc-steps.shtml

and this is the database connectivity code..

Connection con = null;
String url = "jdbc:mysql://localhost:3306/";;
String db = "jdbc";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try{
Class.forName(driver);
con = DriverManager.getConnection(url+db, user, pass);
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT * FROM employee");
while (res.next()) {
String employeeName = res.getString("employee_name");
System.out.println(employeeName );
}

}
catch (Exception e){
System.err.println("Could not load JDBC driver");
System.out.println("Exception: " + e);
e.printStackTrace();
}

Just read the tutorial completely, and u'll able to do it.

Good luck!!!!!!!!