by Dinesh Thakur Category: Servlet with MySql Database

This Function Will Returns the date argument converted to days.

First i made a database named 'dbase' within the reference of mySql(php myAdmin). Then i import all the required java packages from java library as program essentials. I made a class named 'MySqlToDaysFunc', which extends 'HttpServlet'. Then i use service()Method which will use to get the request from the doGet()Method for output on the browser. I loaded all the required drivers for accessing database as required. Then i use to declare the variable as i use 'connection' this will use to create a link between the database and the java code. Then i declare 'resultSet' this will responsible for get the value from selected columns and the rows. i use here now 'preparedStatement' this will execute the selected Query like executeQuery as (SELECT TO_DAYS('2014-05-31') AS todys). Then i use doGet()Method that will bring the output on the web browser.

On the other hand, i use 'HTML' code and tags for presenting the output in a tabular form or in a manner way on the 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 MySqlToDaysFunc 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 TO_DAYS('2014-05-31') AS todys");
                 rs = ps.executeQuery();
             String title = "Using To_Days 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>Result</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>MySqlToDaysFunc</servlet-name>
   <servlet-class>MySqlToDaysFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlToDaysFunc</servlet-name>
   <url-pattern>/MySqlToDaysFunc</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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