Mysql PERIOD_ADD() Function Example using Java Servlet

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

Mysql PERIOD_ADD() Function Example using Java Servlet

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

PERIOD_ADD() function of mysql returns a period after adding no. of months as a period in the format either yyyymm or yymm.

NOTE :- The format yyyymm or yymm of returned value is not a date value.

Syntax :

period_add(period, no_of_month);

Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlPeriodAddServlet 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 PERIOD_ADD(201108, 13)" (This query will return the output as 'period_add' 201209 ) 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 :

MysqlPeriodAddServlet.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 MysqlPeriodAddServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException
{
res.setContentType("text/html");
PrintWriter pw = res.getWriter();
String className = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://192.168.10.13/data";
String user = "root";
String password = "root";
String sql = "SELECT PERIOD_ADD(201108, 13)";
Connection con;
PreparedStatement ps;
ResultSet rs;

try
{
Class.forName(className);
con = DriverManager.getConnection(url, user, password);
ps = con.prepareStatement(sql);
rs = ps.executeQuery();

pw.println("<table>");
pw.println("<tr>");
pw.println("<td><b>PERIOD_ADD(201108, 13)</b></td>");
pw.println("</tr>");

while(rs.next())
{
String period = rs.getString(1);
pw.println("<tr>");
pw.println("<td>"+period+"</td>");
pw.println("</tr>");
}
pw.println("</table>");
}
catch(SQLException sx)
{
pw.println(sx);
}
catch(ClassNotFoundException cx)
{
pw.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>MysqlPeriodAddServlet</servlet-name>
<servlet-class>MysqlPeriodAddServlet</servlet-class>
</servlet>

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

</web-app>

Output :

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

Download Source Code