Sql插入選擇語句PDO

Question

我試圖綁定$userId值$_SESSION存儲在insert select聲明中，但它似乎是如此錯誤。

class Cart { 

    public function addToCart($userId, $prodId) { 

     $sql = "INSERT INTO `cart` (prod_id, user_id, prod_title, prod_img,quantity, price) 
       SELECT product_id, //:user_id//, product_title, product_img, 1, product_price 
       FROM `products` 
       WHERE product_id = :product_id 
     "; 

     $q = $this->_pdo->prepare($sql); 
     $q->execute([ 'user_id' => $userId , 'product_id' => $prodId]); 
    } 

} 

Answer 1

當您使用命名的參數，你應該傳遞給執行功能的陣列中使用該名稱（也 - 不知道爲什麼你有//...//（在//:user_id//）

檢查：

$sql = "INSERT INTO `cart` (prod_id, user_id, prod_title, prod_img,quantity, price) 
      SELECT product_id, :user_id, product_title, product_img, 1, product_price 
      FROM `products` 
      WHERE product_id = :product_id 
    "; 

$q = $this->_pdo->prepare($sql); 
$q->execute([ ':user_id' => $userId , ':product_id' => $prodId]);