First we make a table in database named ‘dbase’ with the reference of mySql (php myAdmin).After then we import all required packages from the Java Library. We make a class named ‘MySqlAddDate’ extends the ‘HttpServlet’. Then after we use service()Method which is use to getting request form doGet() method for output. Then load all the required Drivers. The next step to declare the variables like connection(this variable will use to create a link between database and actual code(java code).while linking the database with code we need resultSet variable which will be the responsible for fetching the value from the desired columns and rows. The other variable will be the preparedStatement which will use to execute the query like executeQuery() as (Select DATE_ADD(NOW(),INTERVAL 45 DAY)).and after using all the variables we use doGet()Method for show output on a web browser.
While getting Output on the Web Browser we use ‘HTML’ Code or some of these tags to present Output in tabular form.
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 MySqlAddDate 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 DATE_ADD(NOW(),INTERVAL 45 DAY) AS dt");
rs = ps.executeQuery();
String title = "To Add Date With Perticular Interval";
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>Added Date </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>MySqlAddDate</servlet-name>
<servlet-class>MySqlAddDate</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
<servlet-name>MySqlAddDate</servlet-name>
<url-pattern>/MySqlAddDate</url-pattern>
</servlet-mapping>
Dinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular