cakephp翻譯查詢cakephp模型查詢

Question

我有2個模型縮放和步驟，其中模型縮放有很多步驟。 的數據庫表是：

scale : id | name | s1 | s2 | s3 | s4 | s5 | s6 | s7 
step : id | val 

我想寫在CakePHP的結構下面的查詢......

select s.id, s1.val as v1, s2.val as v2, s3.val as v3, s4.val as v4, s5.val as v5, s6.val as v6, s7.val as v7 
from scale s 
join step s1 on s.s1 = s1.id 
join step s2 on s.s2 = s2.id 
join step s3 on s.s3 = s3.id 
join step s4 on s.s4 = s4.id 
join step s5 on s.s5 = s5.id 
join step s6 on s.s6 = s6.id 
join step s7 on s.s7 = s7.id 

能否請你幫我的語法？

Answer 1

$this->find('all', array(

     'fields' => array('s1.val', 's2.val'), 
     'joins' => array(array(
      'table' => 'step', 
      'alias' => 's1', 
      'type' => 'inner', 
      'conditions' =>array('Scale.s1 = s1.id') 
      ),array(
      'table' => 'step', 
      'alias' => 's2', 
      'type' => 'inner', 
      'conditions' =>array('Scale.s2 = s2.id') 
      ), 
     ), 
     'conditions' => array('Scale.id = '.$id.'') 
     )); 

Answer 2

我建議你也許改變你的數據庫結構。 Scale不是將Step綁定到Scale中的s1，s2，s3等等，它有一些缺點，其中之一就是它將每個Scale限制爲只有7個步驟，並且它不是一個很好的關係數據庫模型，我建議你創建一個第三個表，稱爲像ScaleSteps，並有三列：

id | ScaleId | StepId 

試想您有相關的7 ID的規模進入，而且規模有步驟項1，2，與之相關聯的3，得到的表是這樣的：

id | ScaleId | StepId 
1 | 7  | 1 
1 | 7  | 2 
1 | 7  | 3 

然後使用設置你的CakePHP模型關係：hasOne，屬於...等，例如：

class Scale extends Model { 
var $name = "Scale"; 
var $hasMany = "ScaleStep"; 
} 

class ScaleStep extends Model { 
var $name = "ScaleStep"; 
var $belongsTo = "Step";  
}