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  1. 04-11-2011, 01:25 AM #1
    Turk80
    Turk80 is offline Member
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    Exclamation Can someone please explain to me the proper way to display the result of a SQL query

    I keep getting stuck on this.

    Here is my servlet:
    Java Code: 
    package HWpackage;

import java.io.*;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.*;
import javax.servlet.http.*;

public class DemoData extends HttpServlet {
   
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Demo of Data Persistence</title>");
            out.println("</head>");
            out.println("<body>");
            
        try {
              String driver = "oracle.jdbc.driver.OracleDriver";
              String url = "jdbc:oracle:thin:@coit-ora01.uncc.edu:1521:class";
              String username = "johnR";
              String password = "lAylko0K";

              // Load database driver if it's not already loaded.
              Class.forName(driver);
              // Establish network connection to database.
              Connection connection =
                DriverManager.getConnection(url, username, password);
              // Create a statement for executing queries.
              Statement statement = connection.createStatement();
              String query =
                "SELECT sum(cost) FROM stocks where username = 'Bora'";
              // Send query to database and store results.
              ResultSet resultSet = statement.executeQuery(query);

              while(resultSet.next()) {
                
			
                out.println("Your total cost is" );
                
                
              }
              connection.close();
            } catch(ClassNotFoundException cnfe) {
              System.err.println("Error loading driver: " + cnfe);
              // Useful when you debug your program on the coit server
              // where System.out.println("") becomes futile
              out.println("<tr>  Error loading driver: " + cnfe);
              out.println("</tr>");
            } catch(SQLException sqle) {
              System.err.println("Error with connection: " + sqle);
              // Again, for debug purpose
              out.println("<tr>  Error with connection: " + sqle);
              out.println("</tr>");
            }

            out.println("</table>");
            out.println("</body>");
            out.println("</html>");
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

    I'd like to know the correct way to post the result of this query in the servlet:
    Java Code: 
    String query =
                "SELECT sum(cost) FROM stocks where username = 'Bora'";
    after the is
    Java Code: 
    out.println("Your total cost is" );
    If someone could provide me that information you will seriously make my night. Thanks everyone.
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  2. 04-11-2011, 01:39 AM #2
    Junky's Avatar
    Junky
    Junky is offline Grand Poobah
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    Default

    I recommend you use a PreparedStatement.

    You have your ResultSet, perhaps you should see what methods that class provides.
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