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Help connecting to mysql tables

Discussion in 'JSP' started by ajrobson, Dec 28, 2006.

  1. ajrobson

    ajrobson New Member

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    I got this ervlet off of coreservlets.com but want to change it so instead of each catalogItem being typed in it gets the infomation from mysql database:

    package coreservlets;
    Code:
    /** A catalog that lists the items available in inventory.
     *  <P>
     *  Taken from Core Servlets and JavaServer Pages 2nd Edition
     *  from Prentice Hall and Sun Microsystems Press,
     *  http://www.coreservlets.com/.
     *  &copy; 2003 Marty Hall; may be freely used or adapted.
     */
    
    public class Catalog {
      // This would come from a database in real life.
      // We use a static table for ease of testing and deployment.
      // See JDBC chapters for info on using databases in
      // servlets and JSP pages.
      private static CatalogItem[] items =
        {
          new CatalogItem
            ("hall002",
             "<I>Core Web Programming, 2nd Edition</I> " +
               "by Marty Hall and Larry Brown",
             "One stop shopping for the Web programmer. " +
               "Topics include \n" +
               "<UL><LI>Thorough coverage of Java 2; " +
               "including Threads, Networking, Swing, \n" +
               "Java 2D, RMI, JDBC, and Collections\n" +
               "<LI>A fast introduction to HTML 4.01, " +
               "including frames, style sheets, and layers.\n" +
               "<LI>A fast introduction to HTTP 1.1, " +
               "servlets, and JavaServer Pages.\n" +
               "<LI>A quick overview of JavaScript 1.2\n" +
               "</UL>",
             49.99),
          new CatalogItem
            ("lewis001",
             "<I>The Chronicles of Narnia</I> by C.S. Lewis",
               "The classic children's adventure pitting " +
               "Aslan the Great Lion and his followers\n" +
               "against the White Witch and the forces " +
               "of evil. Dragons, magicians, quests, \n" +
               "and talking animals wound around a deep " +
               "spiritual allegory. Series includes\n" +
               "<I>The Magician's Nephew</I>,\n" +
               "<I>The Lion, the Witch and the Wardrobe</I>,\n" +
               "<I>The Horse and His Boy</I>,\n" +
               "<I>Prince Caspian</I>,\n" +
               "<I>The Voyage of the Dawn Treader</I>,\n" +
               "<I>The Silver Chair</I>, and \n" +
               "<I>The Last Battle</I>.",
             19.95),
          new CatalogItem
            ("alexander001",
             "<I>The Prydain Series</I> by Lloyd Alexander",
               "Humble pig-keeper Taran joins mighty " +
               "Lord Gwydion in his battle against\n" +
               "Arawn the Lord of Annuvin. Joined by " +
               "his loyal friends the beautiful princess\n" +
               "Eilonwy, wannabe bard Fflewddur Fflam," +
               "and furry half-man Gurgi, Taran discovers " +
               "courage, nobility, and other values along\n" +
               "the way. Series includes\n" +
               "<I>The Book of Three</I>,\n" +
               "<I>The Black Cauldron</I>,\n" +
               "<I>The Castle of Llyr</I>,\n" +
               "<I>Taran Wanderer</I>, and\n" +
               "<I>The High King</I>.",
             19.95),
          new CatalogItem
            ("rowling001",
             "<I>The Harry Potter Series</I> by J.K. Rowling",
             "The first five of the popular stories " +
               "about wizard-in-training Harry Potter\n" +
               "topped both the adult and children's " +
               "best-seller lists. Series includes\n" +
               "<I>Harry Potter and the Sorcerer's Stone</I>,\n" +
               "<I>Harry Potter and the Chamber of Secrets</I>,\n" +
               "<I>Harry Potter and the " +
               "Prisoner of Azkaban</I>,\n" +
               "<I>Harry Potter and the Goblet of Fire</I>, and\n" +
               "<I>Harry Potter and the "+
               "Order of the Phoenix</I>.\n",
             59.95)
            };
    
      public static CatalogItem getItem(String itemID) {
        CatalogItem item;
        if (itemID == null) {
          return(null);
        }
        for(int i=0; i<items.length; i++) {
          item = items[i];
          if (itemID.equals(item.getItemID())) {
            return(item);
          }
        }
        return(null);
      }
    }
    I have made this code below which gets data from mysql tables, at the moment i use it as a simple search but is there a way to merge the two together so the above code gets it catalogItems by using the select statement like in the code below?
    Code:
    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.sql.*;
    
    // Connects to a database to retrieve music data
    
    public class browser extends HttpServlet {
      public void doGet(HttpServletRequest request,
                        HttpServletResponse response)
          throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
    
    
     // Database connection code starts here
    
        Connection conn = null;
    
        // loading jdbc driver for mysql (help in mysql.jar file in classpath)
        try{
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch(Exception e) {
            System.out.println(e);
        }
    
        // connecting to database
        try{
            // connection string for demos database, username demos, password demo-pass
            conn = DriverManager.getConnection
            ("jdbc:mysql:/mysql url goes here");
             // System.out.println("Connection to database successful.");
        }
           catch(SQLException se) {
            System.out.println(se);
        }
    
    // Create select statement and execute it
        try{
            // Get the category from the input form
            String categoryString = request.getParameter("category");
            // check if no category
            if (categoryString == "") categoryString = "Action & Adventure";
    
            // Build up the SQL statement from our data requirements
            String selectSQL = "select title, director, rating, year_released, price, stock_count, image_name "+
                               "from video_recordings "+
                               "where category = '" + categoryString + "'";
            Statement stmt = conn.createStatement();
            ResultSet rs1 = stmt.executeQuery(selectSQL);
    
          // output html headers
          String title = "Films in the " + categoryString + " genre" ;
          out.println(ServletUtilities.headWithTitle(title) +
                    "<BODY BGCOLOR=\"#a00e0e\">\n" +
                "<center><img src=\"http://localhost:8080/examples/LOGO.jpg\" width=350 height=200/></center>\n" +
                    "<H1 ALIGN=\"CENTER\">" + title + "</H1>\n");
    
           out.println("<TABLE BORDER=1 ALIGN=\"CENTER\">\n" +
                    "<TR BGCOLOR=\"#FFAD00\">\n" +
                    "  <TH>Title\n" +
                    "  <TH>Director\n" +
                "  <TH>Rating\n" +
                "  <TH>Year Released\n" +
                "  <TH>Price\n" +
                "  <TH>Number in stock\n" +
                    "  <TH>image name"
                    );
    
    // Retrieve the results
            while(rs1.next()){
                // getInt or getString or getFloat etc to get the appropriate column data
                // wrap output in html for web
                out.println("<TR>" +
                            "<TD>" + rs1.getString("title") + "</TD>" +
                            "<TD>" + rs1.getString("director") + "</TD>" +
                        "<TD>" + rs1.getString("rating") + "</TD>" +
                        "<TD>" + rs1.getDouble("year_released") + "</TD>" +
                        "<TD>" + rs1.getString("price") + "</TD>" +
                               "<TD>" + rs1.getString("stock_count") + "</TD>" +
                    
                            "<TD>" + rs1.getString("image_name")  +"</TD>\n");
                        //"<TD> <IMG SRC=\"../images/music/" + image_name +"\">"
           }
        // close the html
        out.println("</TABLE></BODY></HTML>");
    
    // Close the stament and database connection
    //      (must remember to always do this)
            stmt.close();
            conn.close();
        } catch(SQLException se) {
            System.out.println(se);
        }
        }
    
    
      }
    Any help at all would be really helpful as i am really finding this hard, if you go to http://volume1.coreservlets.com/archive/Chapter9.html you can see the other files for how the catalog works. Again any help would be helpful this is very stessing :mad: lol
     
    Last edited by a moderator: Dec 29, 2006

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