public static function &getInstance()
 {
     if (self::$_instance === null) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 public function getCursorId()
 {
     $tmp = Model_Mobile_CustomerBiSynRate::getInstance()->getLatestData();
     if (empty($tmp)) {
         // 获取不到当日数据,就获取昨日数据
         $date = date("Ymd", time() - 24 * 3600);
         $tmp = Model_Mobile_CustomerBiSynRate::getInstance()->getLatestData($date);
     }
     if (empty($tmp)) {
         return (int) $this->getOption('cursorId');
     }
     return $tmp['biId'] ? $tmp['biId'] : 0;
 }