by Dinesh Thakur Category: Servlet with MySql Database

This Function will use to escape the argument for use in an SQL statement.

I made a table in database named 'dbase' with required fields and within the reference of mySql(php myAdmin). Then i import all the required java packages from java library. Then i made class, which extends 'HttpServlet' named 'MySqlQuoteFunction'. I use here serviceMethod() that will use to getting the request from the doGet()method. Before declaring desired variables, i loaded all the required drivers for database accessing. Then after, i declare variable like 'connection' that will make a link between the database and the actual code. Here i declare 'resultSet' Also which is been responsible for the fetching value from the columns and rows. I declare 'preparedStatement' that will use to executing selected query like executeQuery() as (Select QUOTE('MySql!')). I use doGet()Method that will get Output on the web browser.

Now on the browser to get an output in designer look we just use the 'HTML' code tags, which will present the Output in Tabular form for an efficient look.

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 MySqlQuoteFunction 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 QUOTE('MySql!') as qt");
                    rs = ps.executeQuery();
                String title = "Using Quote 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>MySqlQuoteFunction</servlet-name>
   <servlet-class>MySqlQuoteFunction</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlQuoteFunction</servlet-name>
   <url-pattern>/MySqlQuoteFunction</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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