Why this "Call to undefined method Database :: Prepare ()" error in PHP 5.2?

I am using the following class to connect to the MySQL database

    class Database {

    private static $link = null;

    private static function getLink() {
        if (self::$link) {
            return self::$link;
        }

        $ini = "/home/world/private/mmn_mvsoftware.ini";
        $parse = parse_ini_file($ini, true);

        $driver = $parse ["db_driver"];
        $dsn = "${driver}:";
        $user = $parse ["db_user"];
        $password = $parse ["db_password"];
        $options = $parse ["db_options"];
        $attributes = $parse ["db_attributes"];

        foreach ($parse ["dsn"] as $k => $v) {
            $dsn .= "${k}=${v};";
        }

        self::$link = new PDO($dsn, $user, $password, $options);
        self::$link->Exec("SET AUTOCOMMIT=0");
        self::$link->Exec("SET CHARACTER SET utf8");

        foreach ($attributes as $k => $v) {
            self::$link->setAttribute(constant("PDO::{$k}"), constant("PDO::{$v}"));
        }

        self::$link->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);

        return self::$link;
    }

    public static function __callStatic($name, $args) {
        $callback = array(
            self::getLink(),
            $name
        );

        $res = call_user_func_array($callback, $args);



        return $res;
    }

}

I run this way:

$Query = Database::Prepare("SELECT CURRENT_DATE AS DATA_SYS, CURRENT_TIME AS HORA_SYS");
    $Query->Execute();

It returns me the following message:

Call to undefined method Database :: Prepare ()

It happens that I have Ubuntu servers and CENTOS with PHP5.3 that work in a good, but in the hosting of Locaweb give me this message and will not even pray brava