如何在cakephp中使用聚合函数SUM？

Question

我有这个查询,我想用数量的总和来订购.我必须在分页中使用此结果,请帮帮我..

SELECT (SUM( OrderItem.quantity )) AS qty, `OrderItem`.`item_name` , 
`OrderItem`.`size` FROM `order_items` AS `OrderItem` WHERE 1 =1 
GROUP BY `OrderItem`.`item_name` , `OrderItem`.`size` 
ORDER BY (SUM( OrderItem.quantity )) DESC

我试过下面的代码,但它不起作用

$this->paginate = array('fields'=>array('(SUM(OrderItem.quantity)) as qty',
                                        'OrderItem.item_name',
                                    'OrderItem.size'),
                        'group'=>array('OrderItem.item_name','OrderItem.size'),
                        'order' => array('(SUM(OrderItem.quantity))'=>'DESC'));

Answer 1

您可以使用“自定义查询分页\xc2\xb6”，请点击以下链接：

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http://book.cakephp.org/2.0/en/core-libraries/components/pagination.html#custom-query-pagination

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在您的模型中使用它：

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 public function paginate($conditions, $fields, $order, $limit, $page = 1, $recursive = null, $extra = array()) {\n        $page--;\n        $offset=$limit*$page;\n        $result= $this->find(\'all\',array(\'fields\'=>array(\'(SUM(OrderItem.quantity)) as qty\',\n            \'OrderItem.item_name\',\n            \'OrderItem.size\'),\'group\'=>array(\'OrderItem.item_name\',\'OrderItem.size\'),\'order\' => array(\'qty\'=>\'DESC\'),\'conditions\'=>$conditions,\'limit\'=>$limit, \'offset\'=>$offset));\n       return $result;\n\n    }\n

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