cakephp中使用 find('count')方法

对于find(‘count‘,array(‘group‘=>‘user_id‘));

Model.php中这样描述:

 1 /**
 2  * Handles the before/after filter logic for find(‘count‘) operations. Only called by Model::find().
 3  *
 4  * @param string $state Either "before" or "after"
 5  * @param array $query
 6  * @param array $results
 7  * @return integer The number of records found, or false
 8  * @see Model::find()
 9  */
10     protected function _findCount($state, $query, $results = array()) {
11         if ($state === ‘before‘) {
12             if (!empty($query[‘type‘]) && isset($this->findMethods[$query[‘type‘]]) && $query[‘type‘] !== ‘count‘) {
13                 $query[‘operation‘] = ‘count‘;
14                 $query = $this->{‘_find‘ . ucfirst($query[‘type‘])}(‘before‘, $query);
15             }
16
17             $db = $this->getDataSource();
18             $query[‘order‘] = false;
19             if (!method_exists($db, ‘calculate‘)) {
20                 return $query;
21             }
22
23             if (!empty($query[‘fields‘]) && is_array($query[‘fields‘])) {
24                 if (!preg_match(‘/^count/i‘, current($query[‘fields‘]))) {
25                     unset($query[‘fields‘]);
26                 }
27             }
28
29             if (empty($query[‘fields‘])) {
30                 $query[‘fields‘] = $db->calculate($this, ‘count‘);
31             } elseif (method_exists($db, ‘expression‘) && is_string($query[‘fields‘]) && !preg_match(‘/count/i‘, $query[‘fields‘])) {
32                 $query[‘fields‘] = $db->calculate($this, ‘count‘, array(
33                     $db->expression($query[‘fields‘]), ‘count‘
34                 ));
35             }
36
37             return $query;
38         }
39
40         foreach (array(0, $this->alias) as $key) {
41             if (isset($results[0][$key][‘count‘])) {
42                 if ($query[‘group‘]) {
43                     return count($results);
44                 }
45
46                 return intval($results[0][$key][‘count‘]);
47             }
48         }
49
50         return false;
51     }

在cakephp测试用例中，有这样的描述：

1 $expected = count($Article->find(‘all‘, array(
2             ‘fields‘ => array(‘Article.user_id‘),
3             ‘conditions‘ => array(‘Article.user_id‘ => 1),
4             ‘group‘ => ‘Article.user_id‘)
5         ));
6 $result = $Article->find(‘count‘, array(
7             ‘conditions‘ => array(‘Article.user_id‘ => 1),
8             ‘group‘ => array(‘Article.user_id‘),
9         ));

$expected 和 $result 的结果是一样的。那么使用count，group统计也是可行的。

使用find(‘count‘,array(‘fields‘=>‘distinct user_id‘));效果也是一样的。

cakephp中使用 find('count')方法