by Dinesh Thakur Category: Servlet with MySql Database

This function will provide the formatted value of expression with decimal place.

I use to made a database first named 'dbase' within the reference of mySql(php myAdmin). Then i import all important java packages from java library. Then i made a class named 'MySqlFORMATFunc' extends 'HttpServlet'. Then i use service()Method this will be responsible for the getting the request from the doGet()Method for output. Then i loaded all the required drivers for the database accessing. Then i use to set variables like i use first variable 'connection' that will be responsible for the creating a link between database and the java code. Then i use 'resultSet' this will use to get value from the selected columns and the rows from table. I use here 'preparedStatement' that use to executing the selected query like executeQuery() as (Select FORMAT(12378.8787,8)). Then in last phase i use doGet()Method that will provide the output on the web browser.

I use 'HTML' code and tags to show 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 MySqlFORMATFunc 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 FORMAT(12378.8787,8)");
                      rs = ps.executeQuery();
                   String title = "Using Format 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>Value Is </th>\n"+ "</body> </html>");
                    while(rs.next())
                        {
                             String val = rs.getString(1);
                          disp.println("<tr><td align=\"center\">" + val +"</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>MySqlFORMATFunc</servlet-name>
   <servlet-class>MySqlFORMATFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlFORMATFunc</servlet-name>
   <url-pattern>/MySqlFORMATFunc</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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