Check if user is already taken!?

Hi,
can anyone help, I have successfully contacted the database and also been able to add a new row of info. But before I do this, i want to check and see if the username already exists. How do I do this. below is my jsp page for a member registration to process. THANKS in advance.
kramer
<html>
<head>
<title>Register</title>
</head>
<%@ page import="java.sql.*" %>
<body>
Registration Complete
<hr><br>
<%
String user = request.getParameter("username");
String pass = request.getParameter("password");
String email = request.getParameter("email");
String url = request.getParameter("url");
%>
<%
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:testdb");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String sqlStatement = "INSERT INTO users(username,password,email,url,cr_earned,cr_used) VALUES ('"+user+"','"+pass+"','"+email+"','"+url+"',"+100+","+0+")";
stmt.executeUpdate(sqlStatement);
con.close();
%>
<br>
Your account was successfully setup.
</body>
</html>

This is precisely what i want to do. The purpose here is to sign up a user, but I don't want two users with the same username. So I just want it to check and see if that username is already taken. If it is taken, it can print something or reject then back to the signup page. If the username is not taken, if will add the row. Really simple. Here is my updated working code that still needs the if satement, i just don't kow how to do it....
<%
String user = request.getParameter("username");
String pass = request.getParameter("password");
String email = request.getParameter("email");
String url = request.getParameter("url");
%>
<%
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:testdb");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String sql = "SELECT * FROM users WHERE username = '" + user + "'";
final ResultSet rs = stmt.executeQuery(sql);
String sqlStatement = "INSERT INTO users(username,password,email,url,cr_earned,cr_used) VALUES ('"+user+"','"+pass+"','"+email+"','"+url+"',"+100+","+0+")";
stmt.executeUpdate(sqlStatement);
con.close();
%>

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