在cakephp中使用共享主机帐户上的连接时收到错误

Question

我收到以下错误：

  

SQLSTATE [HY000]：常规错误：2013查询期间与MySQL服务器的连接丢失

执行以下代码时：

$this->query("SET SQL_BIG_SELECTS=1"); 

$joins = array( 
    array( 
        'table' => 'items', 
        'alias' => 'Item', 
        'type' => 'LEFT', 
        'conditions' => array( 
            'Item.TransactionID = Notification.TransactionID', 
            'Item.ItemID = Notification.ItemId' 
        ) 
    ), 
    array( 
        'table' => 'buyers', 
        'alias' => 'Buyer', 
        'type' => 'LEFT', 
        'conditions' => array( 
            'Buyer.OrderId = Item.OrderId' 
        ) 
    ) 
); 

App::import('Component', 'SessionComponent'); 
$this->Session = new SessionComponent(new ComponentCollection()); 
$userSession = $this->Session->read("SESSION_USER");

$fetchrecord = $this->find(
    'all', 
    array( 
        'order' => 'Notification.CommentTime DESC', 
        'conditions' => array( 
            'Notification.KiOuiUserId' => $userSession['id'] 
        ), 
        'joins' => $joins, 
        'fields' => array( 
            'Notification.CommentTime', 
            'Notification.ProcessedSellerNotificationTimeStamp',
            'Notification.ProcessedSellerNotificationComment', 
            'Notification.ProcessedBuyerNotificationTimeStamp', 
            'Notification.ProcessedBuyerNotificationComment', 
            'Notification.ProcessedLeaveFeedbackTimeStamp', 
            'Notification.ProcessedRespondToFeedbackComment',
            'Notification.ProcessedRespondToFeedbackTimeStamp', 
            'Notification.ProcessedLeaveFeedbackComment', 
            'Notification.SellerId', 
            'Notification.ItemId', 
            'Notification.TransactionID', 
            'Notification.TimeStamp', 
            'Item.OrderId', 
            'Item.TransactionID', 
            'Item.Title',
            'Item.GalleryUrl', 
            'Item.BuyerUserID', 
            'Buyer.Email', 
            'Buyer.Name', 
            'Buyer.Street1', 
            'Buyer.CityName', 
            'Buyer.StateOrProvince', 
            'Buyer.Country', 
            'Buyer.PostalCode', 
            'Buyer.Phone', 
            'Buyer.OrderId'
        ), 
        'limit' => 1000 
    )
); 

if ($fetchrecord) 
{ 
    return $fetchrecord;
}

以上查询工作正常的专用托管服务器，并在共享主机上给出错误。任何人都能告诉我解决方案吗？