Using an oracle database, I need to perform a check to see if a user in my 'users' table is banned or not. The user is banned if his column 'banned' has a value of '1', '0' if he is not.

I have the following working code here:

public boolean banUser(String username)
    {//TODO check if user is banned already
        try 
        {
            pstmnt = conn.prepareStatement("UPDATE users SET banned = 1 WHERE username = ?");
            pstmnt.setString(1, username);
            pstmnt.execute();
            logger.info("Banned User : " + username);
            return true;
        } catch ( SQLException e ) { e.getMessage(); }
        return false;
    }

I'm not sure how to perform an if statement on top of a prepared statement. Any ideas?