by Dinesh Thakur Category: Servlet with MySql Database

The 'BIN'(Binary) Function will convert the numeric expression into a binary Expression.

The first instance i make a table into a database named 'dbase' within the reference of mySql(php myAdmin).then i import all the mandatory  java packages from the java library. Then i made a class named 'MySqlBINARYCodeFunc' which extends the 'HttpServlet'.i use serviceMethod() which is responsible for getting request from the doGet()Method for Output on a web browser. After then i loaded all required drivers that necessary for database accessing. At the next move i declare variable those objects will create a criteria to use database i use 'connection' variable(which will be use to create a connection between database and the java code (actual code).the next variable will be the 'resultSet' (this will be responsible for getting value from the desired column and rows as required).and the next one will be the 'preparedStatement' that will use to executing the query like executeQuery() as (Select BIN(35)).at the last instance i use doGet()Method which will use to get output on a web Browser.

On the next step on web browser i use 'HTML' tags that will prefer the Output into tabular form as a manner way.  

EXAMPLE
 
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 MySqlBINARYCodeFunc 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 BIN(35)");
        rs = ps.executeQuery();
            String title = "Using BIN 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>MySqlBINARYCodeFunc</servlet-name>
   <servlet-class>MySqlBINARYCodeFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlBINARYCodeFunc</servlet-name>
   <url-pattern>/MySqlBINARYCodeFunc</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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