by Dinesh Thakur Category: Servlet with MySql Database

This Function Will Show the lower case String.

First i made a database named 'dbase' within the reference of mySql(php myAdmin). Then i import all the required java packages from java library as program essentials. I made a class named 'MySqlLowerCaseFunction', which extends 'HttpServlet'. Then i use service()Method which will use to get the request from the doGet()Method for output on the browser. I loaded all the required drivers for accessing database as required. Then i use to declare the variable as i use 'connection' this will use to create a link between the database and the java code. Then i declare 'resultSet' this will responsible for get the value from selected columns and the rows. I use here now 'preparedStatement' this will execute the selected Query like executeQuery as (Select LCASE('MySql')). Then I use doGet()Method that will bring the output on the web browser.

To get output on the web browser in a tabular form i use 'HTML' code and tag, which bring output in a manner way.

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 MySqlLowerCaseFunction 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 LCASE('MySql') as lwrcase");
                rs = ps.executeQuery();
             String title = "Using LowerCase 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>MySqlLowerCaseFunction</servlet-name>
   <servlet-class>MySqlLowerCaseFunction</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlLowerCaseFunction</servlet-name>
   <url-pattern>/MySqlLowerCaseFunction</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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