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net.wellho.Book class - Java Bean to look up on MySQL database
JSP - JavaServer Pages example from a Well House Consultants training course
More on JSP - JavaServer Pages [link]

This example is described in the following article(s):
   • Java Beans, tag libraries and JSPs - what and why. - [link]

Source code: Book.java Module: J907
package net.wellho;
import java.sql.*;

/* Compiling and testing this class

Test it stand alone, even if the ultimate use is within a JSP or servlet
(something about walking before running ...)

[root@iford classes]# javac net/wellho/Book.java
[root@iford classes]# java net.wellho.Book
java.sql.SQLException: Unable to connect to any hosts due to exception: java.net.ConnectException: Connection refused

--> MySQL server was not running ;-)

[root@iford classes]# java net.wellho.Book
David Flanagan
[root@iford classes]#


public class Book {

        String Isbn;

        public Book () {
                Isbn = null;

        public void setIsbn(String val) {
                Isbn = val;

        public String getAuthor() {
                String Wanted = "author(s) not entered in our database";
                if (Isbn == null) return "Not set";

                try { // Can we connect to database and get a record back?

                        // Use a "pseudoURL ... use oci10 for Oracle, etc
                        // Put in host (port optional), database, user and password

                        Connection books = DriverManager.getConnection

                        // Run the query
                        Statement s = books.createStatement();
                        ResultSet r = s.executeQuery
                        ("Select authorfull from books where isbn = \""+Isbn+"\"");

                        // Step through the result set rather like reading a file line by line
                        while (r.next()) {
                                Wanted = r.getString("authorfull");

                } catch (Exception e) { // Had ISBN but DB failed - return excuse
                        return e.toString();
                return Wanted;

public static void main (String [] args) {
        Book Desk = new Book();
        String By = Desk.getAuthor();

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to Program in Java
 * Java Bootcamp
 * Java Programming for the Web
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Java and associated technologies are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "JSP - JavaServer Pages" training module. You'll find a description of the topic and some other closely related examples on the "JSP - JavaServer Pages" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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