是否可以将以下查询与 Cakephp 分页一起使用?
select u.email,(select count(*) from relatives as iu where iu.user_id=u.id ) as iu_count,(select count(*) from friends as ff where ff.user_id=u.id ) as ff_count from users as u having (iu_count>0 OR ff_count>0)
我尝试使用 cakephp 分页来执行此操作,但它给出了一个错误,因为“iu_count”和“ff_count”在查询的选择部分中不可用,但它们在having子句中可用。我的cakephp分页查询如下。
SELECT COUNT(*) AS `count` FROM `abc`.`users` AS `User` WHERE 1 GROUP BY `User`.`id` having (iu_count>0 OR ff_count>0)
需要帮助/指导来处理此问题。
今天我用谷歌搜索了更多,找到了一个适合我的解决方案。解决方案是重写 Model 中的 paginateCount 方法。
下面是一个被重写的函数。
public function paginateCount($conditions = null, $recursive = 0, $extra = array()) {
$parameters = compact('conditions', 'recursive');
if (isset($extra['group'])) {
$parameters['fields'] = array("iu_count","ff_count");
//$parameters['fields'] = $extra['group'];
if (is_string($parameters['fields'])) {
// pagination with single GROUP BY field
if (substr($parameters['fields'], 0, 9) != 'DISTINCT ') {
$parameters['fields'] = 'DISTINCT ' . $parameters['fields'];
}
unset($extra['group']);
$count = $this->find('count', array_merge($parameters, $extra));
} else {
// resort to inefficient method for multiple GROUP BY fields
$count = $this->find('count', array_merge($parameters, $extra));
$count = $this->getAffectedRows();
}
} else {
// regular pagination
$count = $this->find('count', array_merge($parameters, $extra));
}
return $count;
}
这里“数组(“iu_count”,“ff_count”);”是我在 HAVING 子句中使用的虚拟字段。如果 HAVING 子句中没有需要的虚拟字段,则将 $extra['group'] 分配给 $parameter['fields'] 。
希望这个解决方案能够帮助一些人。