by Dinesh Thakur Category: Servlet with MySql Database

This Function will Returns the quarter from a date argument.

I made a table in database named 'dbase' with required fields and values too. The database made within the reference of mySql(php myAdmin). Then i import all the required java packages from java library with required Condition. I made a class named 'MySqlQuarterFunc', which extends 'HttpServlet'. Here now i use serviceMethod() which will act a role of getting request from doGet()Method for output. Before declaring the variable, i load here all required drivers for the database accessing. Here now time to declaring the variables i declare 'connection' this variable will use to create the link between database and the actual code. The other i declare is 'resultSet' this will use to fetch the value from required columns and rows as required condition. Here i also declare 'preparedStatement' this will get in the use to executing the selected Query like executeQuery as (Select QUARTER('2014-05-31')).Here in the last instance of coding i just use doGet()method which will bring the output on the web browser.

I use here 'Html' code and tags that will present the output in tabular form on the web browser.

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 MySqlQuarterFunc 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 QUARTER('2014-05-31') AS qt");
                  rs = ps.executeQuery();
              String title = "Using Quarter 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>Result</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>MySqlQuarterFunc</servlet-name>
   <servlet-class>MySqlQuarterFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlQuarterFunc</servlet-name>
   <url-pattern>/MySqlQuarterFunc</url-pattern>
</servlet-mapping>




About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular 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.



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