public static function &getInstance()
 {
     if (self::$_instance === null) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 public function getBrokerQuery($brokerId, $sdata, $edata, $dataBase)
 {
     if ($dataBase == Const_ShowcaseOrders::SALE_DB) {
         return Model_Broker_AdQueryProcessSaleLog::getInstance()->getTimeData($brokerId, $sdata, $edata);
     } else {
         if ($dataBase == Const_ShowcaseOrders::RENT_DB) {
             return Model_Broker_AdQueryProcessRentLog::getInstance()->getTimeData($brokerId, $sdata, $edata);
         } else {
             return array();
         }
     }
 }