Question

我使用此代码进行简单的分页：

$paginate = array(
    'limit' => 30,
    'fields' => array('DISTINCT Doctor.id','Doctor.*'),
    'order' => array('Doctor.id' => 'desc'),
    'joins' => array(
        array('table' => 'doctors_medical_degrees',
            'alias' => 'DoctorsMedicalDegree',
            'type' => 'INNER',
            'conditions' => array(
                'Doctor.id = DoctorsMedicalDegree.doctor_id',
            )
        ),
    ),
    'recursive' => -1,
);
$this->Paginator->settings = $paginate;
$data = $this->Paginator->paginate('Doctor');

现在的问题是我正在使用Inner join所以对于Distinct结果我正在使用Distinct Doctor.id，但是在查询分页时的cakephp计数查询不包括Distinct Doctor.id

'query' => 'SELECT COUNT(*) AS `count` FROM `pharma`.`doctors` AS `Doctor` INNER JOIN `pharma`.`doctors_medical_degrees` AS `DoctorsMedicalDegree` ON (`Doctor`.`id` = `DoctorsMedicalDegree`.`doctor_id`)'

你可以看到否

COUNT（DISTINCT Doctor.id）

所以分页会返回更多可以实际返回的结果

Answer 1

问题在于，分页符没有将字段传递给find('count')调用，因此默认情况下它始终依赖于*。

但即使它会传递字段，传递一个数组会使find('count')调用期望将要计数的字段作为COUNT()表达式传递，即类似

'fields' => array('COUNT(DISTINCT Doctor.id) as `count`')

然而，无论如何这对于paginator都无效，所以您需要的是自定义find('count')来电。

自定义查询分拣

有关详细信息，请参阅 Cookbook > Pagination > Custom Query Pagination 。

自定义查询分页可能是您最好的选择，这完全取决于您如何进行计数。

例如，你可以使用paginator组件传递的额外值，这样你就可以传递字段来指望find（'count'）`调用，就像这样（未经测试的示例代码）：< / p>

class Doctor extends AppModel {
    // ...

    public function paginateCount($conditions = null, $recursive = 0, $extra = array()) {
        $parameters = compact('conditions');
        if($recursive != $this->recursive) {
            $parameters['recursive'] = $recursive;
        }

        if(!empty($extra['countField'])) {
            $parameters['fields'] = $extra['countField'];
            unset($extra['countField']);
        }

        return $this->find('count', array_merge($parameters, $extra));
    }
}

$this->Paginator->settings = array(
    'limit' => 30,
    'fields' => array('DISTINCT Doctor.id','Doctor.*'),
    // ...
    'countField' => 'DISTINCT Doctor.id'
);
$data = $this->Paginator->paginate('Doctor');

然后应该创建一个看起来像

的COUNT查询

SELECT COUNT(DISTINCT Doctor.id) AS `count` ...

Answer 2

我在CakePHP - Pagination total count differs from actual count when using DISTINCT找到了解决方案在模型中添加公共函数paginateCount，并在分页器中使用distinct选项，如：

$this->paginate = array('limit' => $limit, 'order' => array('Item.created' => 'ASC', 'Item.code' => 'ASC'),
            'fields' => 'DISTINCT Item.*',
            'conditions' => $conditions,
            'countField'   => array('Item.id'),
            'joins' => $joins,
            'distinct' => 'Item.id',
            'contain' => array(
                'Image' => array('limit' => 1),
                'ItemsTag'
                )
            );

CakePHP：如何使paginator组件使用不同的计数？

2 个答案:

自定义查询分拣