PHP中SQL字段的總和

Question

嗨，我正在嘗試查找PHP中SQL字段的總和。 此總和必須小於或等於我在JavaScript中從控制器收到的數字。 但是我的SQL語法在PHP中不起作用，而是從數據庫中獲取所有行。

public function feedbackaverageAction(){                
    $value =$_GET['value'];
    $db = Zend_Registry::get('dbadapter');
    $select = new Zend_Db_Select($db);
    $select = $db->select();
    $select->from(array('feedback' => 'feedback'),
                   array ('customdata',
                          'checkinprocess',
                          'service_by_owner',
                          'locationrating',
                          'cleanlinessrating',
                          'valueformoneyrating',
                          'kitchenequipmentrating'));
    $select->where('feedback.checkinprocess' + 
                   'feedback.service_by_owner' + 
                   'feedback.locationrating' +
                   'feedback.cleanlinessrating' +
                   'feedback.valueformoneyrating' +
                   'feedback.kitchenequipmentrating' <= $value);
    $stmt = $select->query();
    $result = $stmt->fetchAll();
    $this->view->rows = $result;
}

任何人都可以幫助我如何找到總和並將其檢查為我在控制器中獲得的值。

Answer 1

嘗試使用此代碼，使SQL查詢像這樣。

$value = $_GET['value'];
$db = Zend_Registry::get('dbadapter');
$select = new Zend_Db_Select($db);
$select = $db->select();

$select->from(array('feedback' => 'feedback'),array ('customdata','checkinprocess','service_by_owner','locationrating','cleanlinessrating','valueformoneyrating','kitchenequipmentrating'));

$select->where(new Zend_Db_Expr('feedback.checkinprocess'+'feedback.service_by_owner'+'feedback.locationrating'+'feedback.cleanlinessrating'+'feedback.valueformoneyrating'+'feedback.kitchenequipmentrating')<= $value);

$stmt = $select->query();

$result = $stmt->fetchAll();

$this->view->rows = $result;