Mysql TO_DAYS() Function Example Using Java Servlet

In this tutorial you will learn how to use to_days() function of mysql in java servlet.

Mysql TO_DAYS() Function Example Using Java Servlet

In this tutorial you will learn how to use to_days() function of mysql in java servlet.

TO_DAYS() function of mysql takes the date as argument and calculates the days from the year 0 to the date passed as an argument and then returns the total calculated number of days.

Syntax :

to_days('date');

Here the argument date is a date value.

Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlToDaysServlet which extends the HttpServlet class. In the body of class I overridden the method doGet() and created an objects of HttpServletRequest and HttpServletResponse into its parameter. Inside the doGet() method first I set the mime type that in which format the browser will show the output. In the next line I used the getWriter() method of ServletResponse interface with the object of HttpServletResponse. HttpServletResponse interface extends this method from the ServletResponse. In continue we have to make a connection between java code and database system. So, since I am using Mysql in the example given below therefore, I am loading the driver of mysql and make a connection by using the getConnection() method of DriverManager class. It returns a Connection. Further I am passing the query "SELECT TO_DAYS('2011-08-24') AS TILL_DATE_NO_OF_DAYS" (This query will return the output as 734738 ) into the parameter of prepareStatement() method of Connection interface which gives an object of PreparedStatement interface. In the next line I used the executeQuery() method of PreparedStatement interface which returns a ResultSet object that holds the result of query. At last I have extracted the result from the ResultSet object.

Example :

MysqlToDaysServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MysqlToDaysServlet extends HttpServlet
{
 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws IOException, ServletException
 {
  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  String className = "com.mysql.jdbc.Driver";
  String url = "jdbc:mysql://192.168.10.13";
  String user = "root";
  String password = "root";
  String sql = "SELECT TO_DAYS('2011-08-24') AS TILL_DATE_NO_OF_DAYS";
  
  Connection con;
  PreparedStatement ps;
  ResultSet rs;
  
  try
  {
   Class.forName(className);
   con = DriverManager.getConnection(url, user, password);
   ps = con.prepareStatement(sql);
   rs = ps.executeQuery();
   
   out.println("<table>");
   out.println("<tr>");
   out.println("<td><b>TILL_DATE_NO_OF_DAYS</b></td>");
   out.println("</tr>");
   
   while(rs.next())
   {
	 String toDays = rs.getString(1);
	 out.println("<tr>");
	 out.println("<td>"+toDays+"</td>");
	 out.println("</tr>");
   }
   out.println("</table>");
  }
  catch(SQLException sx)
  {
	out.println(sx);
  }
  catch(ClassNotFoundException cx)
  {
	out.println(cx);
  }
 }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>mysqlDate</display-name>

<servlet>
<servlet-name>MysqlToDaysServlet</servlet-name>
<servlet-class>MysqlToDaysServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>MysqlToDaysServlet</servlet-name>
<url-pattern>/MysqlToDaysServlet</url-pattern>
</servlet-mapping>

</web-app>

Output :

When you will execute the above example you will get the output as :

Download Source Code