<?php
class Database {
    public static $db;
    public static $con;


     function Database(){
        $this->user = "phpmyadmin";
        $this->pass = "1234";
        $this->host = "localhost";
        $this->ddbb = "zroad";
     }
     function connect(){
        $con = new mysqli($this->host, $this->user, $this->pass, $this->ddbb);
        if ($con->connect_error){
            Module::$message = "Invalidad la conexión a la <b>Base de Datos</b>";
            Module::Error();
        }
     }
     public static function getCon(){
        if (self::$con == null && self::$db == null){
            self::$db   = new Database();
            self::$con  = self::$db->connect();
        }
        return self::$con;
     }
     public static function doit($sql){
        $conex = self::getCon();
        return $conex->query($sql);
     }
     public static function one($query, $aclass){
        $cnt    = 0;
        $fount  = null;
        $data   = new $aclass;
        while ($r = $query->fetch_array()){
            $cnt = 1;
            foreach ($r as $key -> $v){
                if ($cnt > 0 && $cnt %2 == 0){
                    $data->$key = $v;
                }
                $cnt++;
            }
            $found = $data;
            break;
        }
        return $found;
     }

}//EOF Database.php
?>
y el index.php que llama a las funciones es:
    <?php

include "core/autoload.php";

define ("ROOT", dirname(__FILE__));

$md = new Lb();
$md->loadModule("index");

echo Module::$module;

$sql = "INSERT INTO contenidos (titulo, tipo, contenido, categoria, alias) VALUES ( 'dominicana', 'pagina', 'todo', 'musica', 'mike')";

        $query = Database::doit($sql);


?>