private boolean isLogged() {
        ResultSet is = null;
        
    try {
            is = dtb.query("SELECT * FROM `active_users` WHERE ip = '"+this.IP+"'");
        } catch(Exception e) {
            System.err.println("Couldn't execute SQL query: "+e);
        }
        
        try {
            int count = 0;

            while(is.next())
                count++;
                
            UI.showMsg("Number of records "+count);
            is.close();
            if(count > 0) {
                if(debug)
                    System.out.println("Logged in");
                    return true;
            }
            else {
                if(debug)
                    System.out.println("Logged out");
                    return false;
            }
        } catch(Exception e) {
            if(debug)
                    System.err.println("Error checking for row: "+e);
        }
        return false;       //If it got here it means there is an error
    }

/*
* DB.java
*
* Created on 10 June 2007, 01:38
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package icadmin.MySql;

import java.sql.*;
import icadmin.UI;

/**
*
*/
public class DB {
    Connection con = null;
    
    /** Creates a new instance of DB */
    public DB(String serv, String db, String user, String pass) {
        String url = "jdbc:mysql://"+serv+"/"+db+"?user="+user+"&password="+pass;
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            con = DriverManager.getConnection(url);
        } catch (Exception e) {
            UI.showErr("Error: "+e);
        }
    }
    
    public ResultSet query(String que) {
        if(con == null) return null;
        
        Statement st = null;
        ResultSet rs = null;
        
        try {
            st = con.createStatement();
            rs = st.executeQuery(que);
        } catch (SQLException e) {
            System.err.println("Culdn't execute SQL command: "+e);
            return null;
        } finally {
            try {
                st.close();
            } catch(SQLException e) {}
        }
        que = null;
        return rs;
    }
    
    public boolean close() {
        try {
        if(con != null)
          con.close();
      } catch(SQLException e) {
          return false;
      }
      return true;
    }
    
}

resultSet = statement.executeQuery(SELECT * FROM active_users WHERE ip = '"+this.IP+"'");

while(is.next())