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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]
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? Class.forName("org.gjt.mm.mysql.Driver").newInstance(); // Use a "pseudoURL ... use oci10 for Oracle, etc // Put in host (port optional), database, user and password Connection books = DriverManager.getConnection ("jdbc:mysql://192.168.200.199/wellho?user=trainee&password=abc123"); // 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(); Desk.setIsbn("0-596-00283-1"); String By = Desk.getAuthor(); System.out.println(By); } } Learn about this subject
This module and example are covered on the following public courses:
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