<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <%@ page import="java.sql.*" %> <% String n=request.getParameter("val"); if(n.length()>0){ try{ Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle"); PreparedStatement ps=con.prepareStatement("select username from quizregister where username='"+n+"'"); ResultSet rs=ps.executeQuery(); while(rs.next()){ out.print("Username already exist"); } con.close(); }catch(Exception e){e.printStackTrace();} }//end of if %>