/**
  * 查询一条子表数据
  *
  * @param $acenterId
  * @param $logDay
  * @return mixed|null
  */
 public static function getBalanceLogSubByAcenterId($acenterId, $logDay)
 {
     return Model_Log_AccountBalanceLogSub::fetchoneLayer(array(array('balanceLogId', '=', $acenterId)), array(array('id', 'desc')), date('m', strtotime($logDay)));
 }