分組項目屬性是一個購物車

Question

我一直在思考這個一段時間，無法想象如何執行。

問題 - 我已經建立了其運作良好，並存儲每個項目在數據庫中ROW（id_cart，id_session，id_product，PRODUCT_NAME，qty_product，cart_price，cart_size，cart_variety，DATE_ADDED）推車機制。但是，當前輸出很好，當表中有兩個項目出現在具有相同id_session和id_product的表中時，我不想重複product_name，除了向qty_product，cart_size，cart_variety和子總計行添加第二行。

相關build_cart.php如下;

$display_block = '<div id="heading">Your Order</div>'; 

// Set cart subtotal to zero 
$subtotal = 0; 

//check for cart items based on user session id 
$get_cart_sql = "SELECT * FROM store_cart WHERE id_session = '".$_COOKIE["PHPSESSID"]."'"; 
$get_cart_res = mysqli_query($dbConnect, $get_cart_sql) or die(mysqli_error($dbConnect)); 

if (mysqli_num_rows($get_cart_res) < 1) { 
    //print message 
    $display_block .= ' 
    <div id="body"><div style="text-align:center; padding:10px; font-weight:bold;">Your cart is currently empty</div>'; 
} else { 
    //get info and build cart display 
    $display_block .= '<div id="body">'; 

    while ($cart_info = mysqli_fetch_array($get_cart_res)) { 
     $id_cart = $cart_info['id_cart']; 
     $product_name = stripslashes($cart_info['product_name']); 
     $product_price = $cart_info['cart_price']; 
     $qty_product = $cart_info['qty_product']; 
     $size = $cart_info['cart_size']; 
     $variety = $cart_info['cart_variety']; 
     $product_total = sprintf("%.02f", $product_price * $qty_product); 

     $display_block .= ' 
     <div> 
      <div id="cart_item">'.$product_name.'</div> 
      <div id="edit_remove"><a href="cart_remove.php?cartitem='.$id_cart.'">remove</a> | <a href="cart_edit.php?cartitem='.$id_cart.'">edit</a></div> 
     </div> 
     <br/> 
     <br/> 
     <div> 
      <div id="qty">'.$qty_product.' X '.$size.'</div> 
      <div id="cart_price">&#163;'.$product_total.'</div> 
     </div> 
     <br/> 
     <br/>'; 

     $subtotal += $product_total; 

    } 

$display_block .= '</div>'; // Here to close "CART EMPTY div 

$display_block .= ' 
<br/> 

    <div id="sub_body"> 

         <div> 
          <div id="sub_titles">Cart Subtotal</div> 
          <div id="sub_price">&#163;'.$subtotal.'</div> 
         </div> 
         <div> 
          <div id="sub_titles">Delivery</div> 
          <div id="sub_price">FREE</div> 
         <br/> 
         <div> 
          <div id="sub_titles">VAT</div> 
          <div id="sub_price">&#163;'.$subtotal*0.2.'</div> 
         </div> 
         <div> 
          <div id="total">Order Total</div> 
          <div id="total_price">&#163;'.$subtotal*1.2.'</div> 
         </div>     
    </div> 

    <div id="checkout">CHECKOUT</div>'; 

} 

echo $display_block; 

Answer 1

改變你的選擇：

SELECT 
    *, SUM(qty_product) AS total_qty 
FROM 
    store_cart 
WHERE id_session = 'your session id' 
GROUP BY id_product 

這將選擇'your session id'組重複行的所有行具有相同id_product和SUM將在總數量加在一起他們。

Documentation一些參考