by Dinesh Thakur Category: Servlet with MySql Database

This Function will return the weekday index.

i made a table in database named 'dbase' with required fields and within the reference of mySql(php myAdmin).Then i import all the required java packages from java library. Then i made class, which extends 'HttpServlet' named 'MySqlWeekDayFunc'. I use here serviceMethod() that will use to getting the request from the doGet ()method. Before declaring desired variables, i load all the required drivers for database accessing. Then after, i declare variable like 'connection' that will make a link between the database and the actual code. Here i declare 'resultSet' Also that is been responsible for the fetching value from the columns and rows. I declare 'preparedStatement' that will use to executing selected query like executeQuery() as (Select WEEKDAY('2014-06-01') AS wd)). I use doGet()Method that will get Output on the web browser.

To getting output on the web browser, I used 'HTML' code and tags that will bring output in tabular form that will make it a manner form.

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 MySqlWeekDayFunc 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 WEEKDAY('2014-06-01') AS wd");
                   rs = ps.executeQuery();
               String title = "Using WEEKDAY 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>The Day is</th>\n"+ "</body> </html>");
                   while(rs.next())
                       {
                              String curr = rs.getString(1);
                          disp.println("<tr><td align=\"center\">" + curr +"</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>MySqlWeekDayFunc</servlet-name>
   <servlet-class>MySqlWeekDayFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlWeekDayFunc</servlet-name>
   <url-pattern>/MySqlWeekDayFunc</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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