左連接不適用於codeigniter

Question

我是代碼igniter中的新功能。我試圖執行delete查詢使用連接多個表，但我收到查詢錯誤。

這是我的查詢代碼。

$this->db->from('order'); 
$this->db->join('item_order', 'item_order.order_id = order.order_id','left'); 
$this->db->join('product', 'product.product_number = item_order.item_number','left'); 
$this->db->join('product_to_image', 'product_to_image.p_id = product.products_id','left'); 
$this->db->join('product_to_dropbox', 'product_to_dropbox.products_id = product.products_id','left'); 

$this->db->where('order.user_name', $ebay_user_name); 
$this->db->where('order.user_id', $user_id); 

$this->db->delete('order'); 

Answer 1

當使用笨你不能用Join執行DELETE。 see here和here。

你需要編寫一個自然的SQL。見鏈接1：

$sql = "DELETE o FROM order as o 
    LEFT JOIN item_order ON item_order.order_id = order.order_id 
    LEFT JOIN product ON product.product_number = item_order.item_number 
    LEFT JOIN product_to_image ON product_to_image.p_id = product.products_id 
    LEFT JOIN product_to_dropbox ON product_to_dropbox.products_id = product.products_id 

    WHERE order.user_name = ? and order.user_id = ?"; 
$this->db->query($sql, array($ebay_user_name, $user_id)); 

或嘗試反引號`。但我不確定是否逃脫它們：

$sql = "DELETE o FROM `order` as o 
    LEFT JOIN `item_order` ON item_order.order_id = order.order_id 
    LEFT JOIN `product` ON product.product_number = item_order.item_number 
    LEFT JOIN `product_to_image` ON product_to_image.p_id = product.products_id 
    LEFT JOIN `product_to_dropbox` ON product_to_dropbox.products_id = product.products_id 
WHERE order.user_name = ? and order.user_id = ?"; 
$this->db->query($sql, array($ebay_user_name, $user_id));