我正在使用以下(有效的)MySQL 查询来获取 collection_keyword 的所有 collection_items 的计数
SELECT ck.id
, ck.working_title
, count(*) as matches
FROM collection_keywords ck
JOIN collection_keywords_collection_items ckci
ON ckci.collection_keyword_id = ck.id
JOIN nl_collection_items nci
ON nci.id = ckci.collection_item_id
GROUP
BY ck.id
SQL fiddle :http://sqlfiddle.com/#!9/7b4b0a/1
返回以下信息
+----+---------------+---------+
| id | working_title | matches |
+----+---------------+---------+
| 1 | First Title | 5 |
| 2 | Second Title | 10 |
| 3 | Third Title | 15 |
+----+---------------+---------+
我正在尝试使用 CakePHP 2.9 复制此查询,但使用 join 方法
结果返回空
这是我的 CakePHP 代码
$collectionKeywords = $this->CollectionKeyword->find('all', array(
'contain' => array(),
'fields' => array('CollectionKeyword.id, CollectionKeyword.working_title', 'count(*) AS matches'),
'joins' => array(
array(
'table' => 'collection_keywords_collection_items',
'type' => 'INNER',
'conditions' => array(
'collection_keywords_collection_items.collection_keyword_id' => 'CollectionKeyword.id'
)
)
),
'group' => 'CollectionKeyword.id',
));
关系定义如下
class CollectionKeyword extends PluginCollectionKeyword
{
public $hasAndBelongsToMany = array(
'CollectionItem' => array(
'className' => 'CollectionItem',
'joinTable' => 'collection_keywords_collection_items',
'foreignKey' => 'collection_keyword_id',
'associationForeignKey' => 'collection_item_id',
)
);
}
与 CollectionItem 的关系
class CollectionItem extends PluginCollectionItem
{
public $hasAndBelongsToMany = array(
'CollectionKeyword' => array(
'className' => 'CollectionKeyword',
'joinTable' => 'collection_keywords_collection_items',
'foreignKey' => 'collection_item_id',
'associationForeignKey' => 'collection_keyword_id',
),
);
}
最佳答案
我在您的代码中发现的一些问题:
Join 的数组键应该是
joins
。您已经使用了join
。缺少第二个内部连接的条件。
这是有效的代码。
$collectionKeywords = $this->CollectionKeyword->find('all', array(
'contain' => array(),
'fields' => array('CollectionKeyword.id, CollectionKeyword.working_title', 'count(*) AS matches'),
'recursive' => -1,
'joins' => array(
array(
'table' => 'collection_keywords_collection_items',
'type' => 'INNER',
'conditions' => array(
"collection_keywords_collection_items.collection_keyword_id = CollectionKeyword`.id"
)
),
array(
'table' => 'collection_items',
'type' => 'INNER',
'conditions' => array(
"collection_items.id = collection_keywords_collection_items.collection_item_id"
)
),
),
'group' => 'CollectionKeyword.id',
));
它产生下面的查询
SELECT CollectionKeyword.id, CollectionKeyword.working_title, count(*) AS matches FROM `collection_keywords` AS `CollectionKeyword` INNER JOIN `collection_keywords_collection_items` ON (`collection_keywords_collection_items`.`collection_keyword_id` = `CollectionKeyword`.`id`) INNER JOIN `collection_items` ON (`collection_items`.`id` = `collection_keywords_collection_items`.`collection_item_id`) WHERE 1 = 1 GROUP BY `CollectionKeyword`.`id`
根据您使用的 Cakephp 版本,您可以使用 code 验证运行的最后一个查询。 .
关于php - CakePHP 2.9 连接查询返回错误结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57568304/