by Dinesh Thakur Category: Servlet with MySql Database

This function will use to check that required Value is in the expression or Not.

I made a database named 'dbase' that made in the reference of mySql(php myAdmin). After I import all the required java packages from java library. Then I made a class named 'MySqlINFunction' which extends 'HttpServlet'. Then i use service()Method that will help to get the request from the doGet()Method for output. After i loaded all the required drivers for database accessing. I declare variables as I use 'connection' that will use to make a link with database and the java code. The other i declare is 'resultSet' that will responsible for the getting value from the selected columns and the rows. Then i use 'preparedStatement' that will be using to executing the selected Query like executeQuery() as (SELECT 8 IN(2,8,7)). I use here in last phase doGet()Method that will present the value 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 MySqlINFunction 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 8 IN(2,8,7)");
             rs = ps.executeQuery();
            String title = "Using IN() 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</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>MySqlINFunction</servlet-name>
   <servlet-class>MySqlINFunction</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlINFunction</servlet-name>
   <url-pattern>/MySqlINFunction</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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