by Dinesh Thakur Category: Servlet with MySql Database

This Function Will return the leftmost character of the argument is a multi-byte character, returns the code for that character returns the code for that character.

First i import all the required java packages from java library. Then after, i made a class named 'MySqlORDFunction' extends the 'HttpServlet'.i use the serviceMethod() which is responsible for the getting request from doGet() method. Then after, need to load all the drivers as required. And to declare the mandatory variables like Connection (the variable Connection will use to establish the link between database and java code (actual code). ResultSet the variable resultset does the job to fetch the value from required columns and rows. PreparedStatement this variable use to execute the query like executeQuery() as (Select ORD('mysql')) and after then i use doGet() method to get the output on the web Browser.

To see the result in tabular form we use 'HTML' tags for Impressive looking Output on a web browser.

import java.io.IOException;

import java.io.PrintWriter;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MySqlORDFunction extends HttpServlet
   {
       public void service(HttpServletRequest rq, HttpServletResponse rp)throws IOException, ServletException
         {
              rp.setContentType("text/html");
              PrintWriter disp = rp.getWriter();
              String driver = "com.mysql.jdbc.Driver";
              String url = "jdbc:mysql://localhost/dbase";
              String uid = "root";
              String psw = "root";
              Connection con=null;
              PreparedStatement ps = null;
              ResultSet rs;
              try
               {
                    Class.forName(driver);
                    con = DriverManager.getConnection(url,uid,psw);
                    ps=con.prepareStatement("Select ORD('mysql')");
                    rs = ps.executeQuery();
                                String title = "Using ORD Function";
                    String docType ="<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
                                disp.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" +
                    "<body bgcolor=\"#f4efef\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<ul>\n" +
                                "<table width=\"50%\" border=\"1\" align=\"center\">\n" + "<th>Value Is </th>\n"+ "</body> </html>");
                    while(rs.next())
                        {
                             String val = rs.getString(1);
                                         disp.println("<tr><td align=\"center\">" + val +"</td></tr>" );  
                        }     
               }          
                                         catch(Exception e) 
                                          {
                                               e.printStackTrace();
                                          }
                                               disp.close();
          }
                                       public void doPost(HttpServletRequest rq,HttpServletResponse rp)throws IOException,ServletException
                                                 {
                                                 doGet(rq,rp);
                                                 }
   }
WEB.XML
 
<servlet>
   <servlet-name>MySqlORDFunction</servlet-name>
   <servlet-class>MySqlORDFunction</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlORDFunction</servlet-name>
   <url-pattern>/MySqlORDFunction</url-pattern>
</servlet-mapping>




About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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