public static function db()
{
if (self::$_db === NULL) {
if (self::$_useDbReplicate === NULL) {
self::loadCore('db/DooSqlMagic');
self::$_db = new DooSqlMagic();
} else {
self::loadCore('db/DooMasterSlave');
self::$_db = new DooMasterSlave();
}
}
if (!self::$_db->connected) {
self::$_db->connect();
}
return self::$_db;
}