read value from database & alert it is available in database or not

how to read value from text box and alert whether it is available in database or not?

View Answers

February 16, 2012 at 5:29 PM

1)availability.jsp:

<html>
<head>
<script type="text/javascript">
function check(value){ 
xmlHttp=GetXmlHttpObject()
var url="check.jsp";
url=url+"?name="+value;
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged(){ 
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
    var showdata = xmlHttp.responseText; 
    document.getElementById("mydiv").innerHTML= showdata;
    } 
}
function GetXmlHttpObject(){
var xmlHttp=null;
try{
  xmlHttp=new XMLHttpRequest();
 }
catch (e) {
 try {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e){
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}
</script>
</head>
<body>
<form name="form">
 UserName: <input  type="text" name="name" id="name" onkeyup="check(this.value);"><font color="red"><div id="mydiv"></div></font>
</form>    

</body>
</html>

2)check.jsp:

<%@ page import="java.sql.*" %> 
<%
String name = request.getParameter("name").toString();
System.out.println(name);
String data ="";
try{
           Class.forName("com.mysql.jdbc.Driver");
           Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
           Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from login where username='"+name+"'");
int count=0;
          while(rs.next())
          {

                   count++;
          }

                    if(count>0)
          {
             data="Not Available";
          }
          else
          {
                      data="Available";
          }
out.println(data);
System.out.println(data);
}
catch (Exception e) {
System.out.println(e);
}
%>

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