by Dinesh Thakur Category: Servlet with MySql Database

This function returns the date or date time expression.

First i make a table in database named 'dbase' with required fields and values in it and within the reference of mySql(Php Admin).then i import all the required java package from java library. I made a class named 'MySqlTimeStampFunc' extends the 'HttpServlet'. Then i use serviceMethod() which will bring the request from doGet()Method for Output. Then i load all the drivers for database accessing. After, then i declare variables, which are necessary for database conditions as i declare connection (this variable will use to make a link between database and java code or actual code). After, then i declare resultset (this variable will use to get the values from desired columns and rows as required from query).The next one will be the preparedStatement (this variable will responsible for the executing query like executeQuery() as (SELECT TIMESTAMP('2014-05-31 22:11:11') AS ts). In the last i used the doGet()Method which will bring the output on the web Browser.

I use here some tags of 'HTML' that will bring output in a tabular form as required.  

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 MySqlTimeStampFunc 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 TIMESTAMP('2014-05-31 22:11:11') AS ts");
                  rs = ps.executeQuery();
              String title = "Using Time Stamp 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>MySqlTimeStampFunc</servlet-name>
   <servlet-class>MySqlTimeStampFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlTimeStampFunc</servlet-name>
   <url-pattern>/MySqlTimeStampFunc</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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