The function ‘CONVERT_TZ’ will convert the regional time zone as required.
The first i make a table in database named ‘dbase’ with the required fields and value in it database is been created with the reference of mySql(php myAdmin).then i import all the required java packages from java library according to the program need. I made a class named ‘MySqlConvertTimeZone’ completely extends ‘HttpServlet’. Then i use the serviceMethod() which use to getting request from doGet()Method. Here i loaded all the required drivers for database accessing. after that i declare mandatory variables for database conditions. Like i declare ‘Connection’ this variable will use to create a link between database and the java code. The other one will be the ‘resultSet’ this will be the responsible for the fetching value from the selected columns and rows. The next variable will be the ‘preparedStatement’ this variable is been used to executing the selected query like executeQuery() as (SELECT CONVERT_TZ(‘2014-05-30 11:03:00′,’IST’,’GMT’). Now here i use doGet()method which will bring the output on web browser.
To getting output in a manner way or in impressive look i use some of ‘HTML’ tags that are present the output in tabular form on the web browser.
EXAMLPE
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 MySqlConvertTimeZone 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 CONVERT_TZ('2014-05-30 11:03:00','IST','GMT')");
rs = ps.executeQuery();
String title = "To Convert Time Zone";
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>Desired Time </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>MySqlConvertTimeZone</servlet-name>
<servlet-class>MySqlConvertTimeZone</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
<servlet-name>MySqlConvertTimeZone</servlet-name>
<url-pattern>/MySqlConvertTimeZone</url-pattern>
</servlet-mapping>
Dinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular