導出爲CSV時操作數據？

Question

我正在使用CodeIgniter v2.2.4

請考慮以下代碼，以導出/下載代表數據庫查詢結果的CSV文件。

CONTROLLER：

public function export_csv($id = NULL) 
{ 
    $this->load->dbutil(); 
    $this->load->helper('download'); 

    $query = $this->my_model->create_csv($id); // call the model 

    $data = $this->dbutil->csv_from_result($query, ','); 

    force_download($id . '.csv', $data); 
} 

MODEL：

public function create_csv($id) 
{ 
    $this->db->from('mytable'); 

    $this->db->where('id', $id); 

    $this->db->select(' 
     id   AS `ID`, 
     full_name  AS `Full Name`, 
     company_name AS `Company Name`, 
     phone   AS `Phone Number`, 
     select_list AS `User Options` 
    ', FALSE); 

    return $this->db->get(); 
} 

上面的代碼工作，然而select_list值爲0，1，或2而這插入CSV導出。如何將這些值操縱爲我最終的CSV文件中更有意義的文本？

例子：

'DB value' => 'insert into CSV' 
     0 => 'N/A', 
     1 => 'foo', 
     2 => 'bar' 

Answer 1

最簡單方法是沿着這些線路

$this->db->select(
    "id   AS `ID`, 
    full_name  AS `Full Name`, 
    company_name AS `Company Name`, 
    phone   AS `Phone Number`, 
    CASE select_list WHEN = 1 THEN 'foo' WHEN = 2 THEN 'bar' ELSE 'N/A' END 
    AS `User Options`", FALSE); 

取消，使用select語句！這是錯誤的。

它應該是使用CASE之後可選expression時如下，即CASE select_list ...

$this->db->select(
    "id   AS `ID`, 
    full_name  AS `Full Name`, 
    company_name AS `Company Name`, 
    phone   AS `Phone Number`, 
    CASE select_list WHEN 1 THEN 'foo' WHEN 2 THEN 'bar' ELSE 'N/A' END 
    AS `User Options`", FALSE); 

我被混合的不同的形式的聲明可以在第一（不正確的）例如使用。

Answer 2

這是爲我工作的確切語法...

$this->db->select(" 
    id   AS `ID`, 
    full_name  AS `Full Name`, 
    company_name AS `Company Name`, 
    phone   AS `Phone Number`, 
    CASE 
     WHEN select_list = 1 THEN 'foo' 
     WHEN select_list = 2 THEN 'bar' 
     ELSE 'N/A' 
    END   AS `User Options` 
", FALSE); 

這種變化也適用...

$this->db->select(" 
    id   AS `ID`, 
    full_name  AS `Full Name`, 
    company_name AS `Company Name`, 
    phone   AS `Phone Number`, 
    CASE select_list 
     WHEN 1 THEN 'foo' 
     WHEN 2 THEN 'bar' 
     ELSE 'N/A' 
    END   AS `User Options` 
", FALSE);