Zend_Db的嵌套查詢，其中一個查詢從另一個

Question

需要的ID我是相當新的Zend框架，並搜查了幾天沒有找到一個例子了以下問題：

結果我試圖從代碼實現下面是一個列表，它將在主類別中包含匹配的子類別，並遍歷我的所有主類別。

實施例：

設備（主類別）

• 微波
• 火爐

電子（主類別）

• 計算機
• 無線電

這是代碼（我再也不知道該怎麼做;我的思維過程是不嵌套foreach()，與第二foreach()獲得的主要類別ID從第一選擇）：

// Get Categories with Sub Categories 

$catid = 0; 

$selectmain = $this->dbhInstance->select() 
           ->from(array('a' => 'code_sub_category'), 
             array('b.id as mainid', 'b.site_category')) 
           ->join(array('b' => 'site_categories'), 
             'b.id = a.site_category_id') 
           ->group("b.id") 
           ->order("b.site_category"); 

$selectsub = $this->dbhInstance->select() 
           ->from(array('a' => 'code_sub_category'), 
             array('a.id as subid', 'a.sub_category', 'a.site_category_id')) 
           ->join(array('b' => 'site_categories'), 
             'b.id = a.site_category_id') 
           ->where("a.site_category_id = '" . $catid . "'") 
           ->order("a.sub_category"); 

$fetch = $this->dbhInstance->fetchAll($selectmain); 
$fetch2 = $this->dbhInstance->fetchAll($selectsub); 
//var_dump($fetch2); 

$items = array(); 
$items2 = array(); 

foreach ($fetch as $key => $value) { 
    $catid = $value['id']; 
    $items = array_merge($items, array($key => $value)); 

    foreach ($fetch2 as $key => $value) { 
     $items = array_merge($items, array($key => $value)); 
    } 

    $this->view->getsubcategories = $items; 
} 

$this->view->getmaincategories = $items; 
//End FULL Categories for My Categories 

Answer 1

你可以試試這個：

$selectCat = $this->dbhInstance->select() 
          ->from(array('c' => 'site_categories'), array('c.id as id', 'c.site_category as text, 0 as parent')) 
          ->order('c.site_category'); 

$selectSubCat = $this->dbhInstance->select() 
          ->from(array('sc' => 'code_sub_category'), array('sc.id as id', 'sc.sub_category as text', 'sc.site_category_id as parent') 
          ->order('sc.sub_category'); 

$select = $this->dbhInstance->select()->union(array($selectCat, $selectSubCat)); 

$statement = $this->dbhInstance->query($select); 

$items = array(); 
$childs = array(); 

while($row = $statement->fetch()) { 
    $items[] = (object)array(
    'id' => $row['id'], 
    'text' => $row['text'], 
    'parent' => $row['parent'], 
    'item' => array() 
); 
} 

foreach($items as $item) 
$childs[$item->parent][] = $item; 

foreach($items as $item) if (isset($childs[$item->id])) 
$item->item = $childs[$item->id]; 

if(!isset($childs[0])) $this->view->getmaincategories = $getmaincategories = array(); 
else 
$this->view->getmaincategories = $getmaincategories = $childs[0]; 

// Display the result 
Zend_Debug::dump($getmaincategories); 

的結果將是一個數組對象，這樣的事情：

array(
'Appliances' => array(
    'Microwave', 
    'Stove' 
), 
'Electronics' => array(
    'Computer', 
    'Radio' 
) 
) 

希望這個幫助！

Regards， Ahmed。