by Dinesh Thakur Category: Servlet with MySql Database

This Function adds an interval to a date time expression.

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 'MySqlTimeStampAddFunc'. I use here serviceMethod() that will use to getting the request from the doGet()method. Before declaring desired variables, i loaded 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 TIMESTAMPADD(HOUR,2,'22:11:11') AS tsadd).I use doGet()Method that will get Output on the web browser.

To feel look good the result we use a tabular form concept. For this kind of requirement, we use ‘HTML’ coding and some of tags to use Output in Designer look to show 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 MySqlTimeStampAddFunc 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 TIMESTAMPADD(HOUR,2,'22:11:11') AS tsadd");
                    rs = ps.executeQuery();
                String title = "Using Time Stamp Add 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>MySqlTimeStampAddFunc</servlet-name>
   <servlet-class>MySqlTimeStampAddFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlTimeStampAddFunc</servlet-name>
   <url-pattern>/MySqlTimeStampAddFunc</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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