public static function setLimit($ItLimit = 50, $ItPage = 1)
{
if (!empty(self::$StLimit)) {
self::$StLimit = NULL;
}
$ItLimit = self::NumberValidate($ItLimit, EXC_INVALID_LIMIT, TRUE);
$ItPage = self::NumberValidate($ItPage, EXC_INVALID_PAGE, TRUE);
$ItStart = ($ItPage - 1) * $ItLimit;
self::$StLimit = " LIMIT {$ItStart}, {$ItLimit}; ";
}