UpdateLarare.java (SERVLET)

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import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author sofiehamilton
 */

public class UpdateLarare extends HttpServlet {

    Connection conn;
    Statement stmt;
    String firstname;
    String lastname;
    String email;
    int phone;
    String password;
    String admin = "0";
    String dburl = "jdbc:mysql://localhost:3306/oru?zeroDateTimeBehavior=convertToNull";
    String Username = "root";
    String PassWord = "";

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @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 processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, ClassNotFoundException, SQLException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {

            firstname = request.getParameter("fornamntxt");
            lastname = request.getParameter("efternamntxt");
            email = request.getParameter("emailtxt");
            password = request.getParameter("passwordtxt");
            phone = Integer.parseInt(request.getParameter("nummertxt"));

    admin = request.getParameter("adminbtn");
    if (admin != null)
        admin = "1";


                Class.forName("com.mysql.jdbc.Driver");
                conn = DriverManager.getConnection(dburl, Username, PassWord);
                stmt = conn.createStatement();

                 // Execute SQL query
         String query = "update LARARE set "
                    + "PHONE = '" + phone + "' , "
                    + "EMAIL = '" + email + "' ,"
                    + "PASSWORD = '" + password + "',"
                    + "ADMIN = '" + admin + "'"
                    + " where FIRSTNAME = '" + firstname + "' and LASTNAME = '" + lastname + "'";

        stmt.executeQuery(query);


        }

         catch (Exception e){
                e.printStackTrace();
            }
    }

    // <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
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(UpdateLarare.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(UpdateLarare.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * 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
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(UpdateLarare.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(UpdateLarare.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

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

}