Zend_Db的嵌套查询，其中一个查询从另一个

Question

需要的ID我是相当新的Zend框架，并搜查了几天没有找到一个例子了以下问题：

结果我试图从代码实现下面是一个列表，它将在主类别中包含匹配的子类别，并遍历我的所有主类别。

实施例：

设备（主类别）

• 微波
• 火炉

电子（主类别）

• 计算机
• 无线电

这是代码（我再也不知道该怎么做;我的思维过程是不嵌套foreach()，与第二foreach()获得的主要类别ID从第一选择）：

// 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

你可以试试这个：

$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); 

的结果将是一个数组对象，这样的事情：

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

希望这个帮助！

Regards， Ahmed。