将Mysql查询转换为cakephp条件

我想把这个查询转换成cakephp

SELECT l.* , (
                (
                (
                ACOS( SIN( (
                $lat * PI( ) /180 ) ) * SIN( (
                l.lat * PI( ) /180 )
                ) + COS( (
                $lat * PI( ) /180 )
                ) * COS( (
                l.lat * PI( ) /180 )
                ) * COS( (
                ( $lng  -  l.long ) * PI( ) /180 )
                )
                )
                ) *180 / PI( )
                ) *60 * 1.1515 * 1.609344
                ) AS  `distance` 
                FROM  hosts l 
                HAVING  `distance` <= 50
                ORDER BY  `distance` ASC

---

在调用

Model:：find:

// Controller code

$this->Note->virtualFields = array(
    'distance' => "( 3959 * acos( cos( radians($lat) ) * cos( radians( Note.latitude ) ) * cos( radians( Note.longitude ) - radians($lng) ) + sin( radians($lat) ) * sin( radians( Note.latitude ) ) ) )"
);
$data = $this->Note->find('all', array('fields' => array('distance'), 'conditions' => array('distance <' => 1)));

//控制器代码
$this->Note->virtualFields=array(
“距离”=>“（3959*acos（弧度（$lat））*cos（弧度（注.纬度））*cos（弧度（注.经度）-弧度（$lng））+sin（弧度（$lat））*sin（弧度（注.纬度）））”
);
$data=$this->Note->find（'all'，array（'fields'=>array（'distance'），'conditions'=>array（'distance Tip:-使用虚拟字段）。
// Controller code

$this->Note->virtualFields = array(
    'distance' => "( 3959 * acos( cos( radians($lat) ) * cos( radians( Note.latitude ) ) * cos( radians( Note.longitude ) - radians($lng) ) + sin( radians($lat) ) * sin( radians( Note.latitude ) ) ) )"
);
$data = $this->Note->find('all', array('fields' => array('distance'), 'conditions' => array('distance <' => 1)));