by Dinesh Thakur Category: Servlet with MySql Database

This Function 'TIME_STAMP' will return the date or date time expression.

First i make a table in database named 'dbase' within the reference of mySql(php myAdmin).then i import all the mandatory java packages from the java library as required for program. I made a class named 'MySqlCurrTimeStamp' which extends 'HttpServlet'.i use serviceMethod() which is been carry the request from doGet()Method for Output. Then after to declare the variable i loaded all the required drivers before for database accessing. Here i declare the variables like 'connection' this variable will create a link between database and java code. Then i call 'resultSet' this will be responsible for Getting value from the selected columns and the rows.

Then i declare 'preparedStatement' which will get to execute the selected query like executeQuery() as (Select CURRENT_TIMESTAMP() AS now). Here i use doGet()Method which will use to get output on the web browser.

While on the web browser to get output in tabular form i use 'HTML' code and tags for a manner way look. 

 
EXAMPLE
 
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 MySqlCurrTimeStamp 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 CURRENT_TIMESTAMP() AS now");
            rs = ps.executeQuery();
            String title = "Using Current 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>Time Stamp Example  </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>MySqlCurrTimeStamp</servlet-name>
   <servlet-class>MySqlCurrTimeStamp</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlCurrTimeStamp</servlet-name>
   <url-pattern>/MySqlCurrTimeStamp</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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