使用情況/時/然後在Zend框架2

Question

的SQL查詢，我查詢：

SELECT user_name, group_id, 
     CASE WHEN col_1 = 1 THEN 0 
      WHEN col_2 = 1 THEN 1 
      WHEN col_3 = 1 THEN 2 
     END as merge_col 
FROM some_table 
WHERE group_id = 10 
ORDER BY merge_col. 

如何使用ZF2和的Zend \ .. \ SQL，我可以實現這個查詢？

更新：

感謝誰試圖幫助我。它的工作如下：

$select->columns(array(
      'user_name', 
      'group_id', 
      'merge_col' => new Expression('CASE WHEN col_1 = 1 THEN 0 
        WHEN col_2 = 1 THEN 1 
        WHEN col_3 = 1 THEN 2 END'))) 
->where (array('group_id'=> 10)) 
->order ('merge_col'); 

有沒有更好的答案？

謝謝。

Answer 1

使用Zend \ DB \ SQL \表達：

use Zend\Db\Sql; 
    .... 

    $sql = $this->tableGateway->getSql(); 
    $select = $sql->select(); 
    $select->columns(array('user_name', 'group_id', 
      new Sql\Expression('CASE WHEN col_1 = 1 THEN 0 
        WHEN col_2 = 1 THEN 1 
        WHEN col_3 = 1 THEN 2 
         END as merge_col'))); 

    return $this->tableGateway->selectWith($select); 

Answer 2

$select = $sql->select ('some_table'); 
$select->columns(array(
      new Expression('CASE WHEN col_1 = 1 THEN 0 
        WHEN col_2 = 1 THEN 1 
        WHEN col_3 = 1 THEN 2 
         END AS merge_col'), 'user_name', 'group_id')) 
->where ('group_id = 10') 
->order ('merge_col'); 

Answer 3

下面是參數爲您解決問題的一個更好的辦法。您更新的答案解決了我的問題，但隨後使用參數化更好。

$case = 'CASE '; 
$sqlCase = $this->getAdapter(); 
$case .= $sqlCase->quoteInto('WHEN col_1 = 1 THEN ? ', yourVariable, Zend_Db::INT_TYPE); 
$case .= $sqlCase->quoteInto('WHEN col_2 = 1 THEN ? ', yourVariable, Zend_Db::INT_TYPE); 
$case .= $sqlCase->quoteInto('WHEN col_2 = 1 THEN ? ', yourVariable, Zend_Db::INT_TYPE); 
$case .= 'ELSE 0 END '; 

及以下你的代碼的其餘部分。只要看看我在上面的代碼中生成的變量$case。爲什麼$case是字符串？因爲Zend_Db_Expr需要String值。

$select =$this->getAdapter(); 
$select->columns(array(
      'user_name', 
      'group_id', 
      'merge_col' => new Zend_Db_Expr($case))) 
     ->where (array('group_id'=> 10)) 
     ->order ('merge_col');