MySql DayOfMonth() in Java Servlet

by Dinesh Thakur Category: Servlet with MySql Database

This function will return the Value of Month's Day in Numeric value (1 to 31).

First i create a database named 'dbase' within the reference of mySql(php myAdmin).then according to program need i import all the required java packages from java library. Then i create a class named 'MySqlDayOfMonth' which extends the 'HttpServlet'. Then i use service()Method that will use to getting request from the doGet()Method for output generating. Then i loaded all the required drivers for the database accessing. After that i declare variables like 'connection' this variable is responsible for the creating a link between database and the java code. The other i declare the 'resultSet' this variable is use to get value from the columns and rows. In other variable i use 'preparedStatement' this will use to execute the selected query like executeQuery() as (Select DAYOFMONTH('2014-05-31')). Here in the last i use doGet()Method for output on the web browser.

Here in the last i use 'HTML' Code and tags that will present the output in tabular form on the web browser.

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 MySqlDayOfMonth 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 DAYOFMONTH('2014-05-31') AS dm");


                  rs = ps.executeQuery();


               String title = "Using Day Of Month 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>Day</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>MySqlDayOfMonth</servlet-name> 


   <servlet-class>MySqlDayOfMonth</servlet-class> 


</servlet> 


<!-- servlet mapping --> 


<servlet-mapping> 


   <servlet-name>MySqlDayOfMonth</servlet-name> 


   <url-pattern>/MySqlDayOfMonth</url-pattern> 


</servlet-mapping>

About Dinesh Thakur

Dinesh Thakur holds an B.C.A, MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes 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.