Question

image of the cart (sorry it's in Frensh)

我已经使用会话设置了购物车，但是现在我正在更新代码以将其添加到数据库中，但是当数量变化时我在更新时遇到问题，我不知道问题出在哪里。

添加和删除工作完美，但是当我增加数量时，它在数据库中始终设置为零，总数保持不变。

这是三个按钮的代码：删除-添加-删除

 <td><a class='btn btn-warning' href='../Ressources/cart.php?remove= 
{$row['product_id']}'><span class='glyphicon glyphicon-minus'></span></a>
    <a class='btn btn-success' href='../Ressources/cart.php?add= 
{$row['product_id']}'><span class='glyphicon glyphicon-plus'></span></a>
    <a class='btn btn-danger' href='../Ressources/cart.php?delete= 
{$row['product_id']}'><span class='glyphicon glyphicon-remove'></span></a>
</td>

这是PHP代码：

/*****************************add**********************/
if (isset($_GET['add'])) {
    $id = $_SESSION['id_user'];
    $idp = $_GET['add'];
    $query = query("SELECT * FROM products WHERE product_id=".escape_string($_GET['add']). " ");
    confirm($query);

    while ($row = fetch_array($query)) {
        if ($row['product_quantity'] != $_SESSION['product_' . $_GET['add']]) {
            $_SESSION['product_' . $_GET['add']] += 1;
            $quantity = $_SESSION['product_' . $_GET['add']];
            $total = $quantity * $row['product_price'];
            $query2 = query("SELECT * FROM cart where id_product=$idp and id_user=$id");
            confirm($query2);
            if (mysqli_num_rows($query2) == 0) {
                $query1 = query("INSERT into cart values ($id,$idp,$quantity,$total)");
            } else {
                $query1 = query("UPDATE cart set quantity=$quantity and total=$total where id_product=$idp and id_user=$id");
            }
            confirm($query1);
            redirect("../Public/checkout.php");
        } else {
            set_message("there's only " . $row['product_quantity'] . " 
            " . "available");
            redirect("../Public/checkout.php");
        }
    }
}

/*************** remove *********************/
if (isset($_GET['remove'])) {
    $idp = $_GET['remove'];
    $id = $_SESSION['id_user'];
    $_SESSION['product_' . $_GET['remove']]--;
    $quantity = $_SESSION['product_' . $_GET['remove']];
    $total = $_SESSION['item_total'];
    $query = query("UPDATE cart set quantity=$quantity and total=$total 
        where id_product=$idp and id_user=$id");
    confirm($query);
    if ($_SESSION['product_' . $_GET['remove']] < 1) {
        unset($_SESSION['item_total']);
        unset($_SESSION['item_quantity']);
        unset($_SESSION['nb_product']);
        $query1 = query("DELETE FROM cart where id_product=$idp and id_user=$id");
        confirm($query1);
        redirect("../Public/checkout.php");
    } else {
        redirect("../Public/checkout.php");
    }
}

/*************** delete ********************/
if (isset($_GET['delete'])) {
    $idp = $_GET['delete'];
    $id = $_SESSION['id_user'];
    $_SESSION['product_' . $_GET['delete']] = '0';
    unset($_SESSION['item_total']);
    unset($_SESSION['item_quantity']);
    unset($_SESSION['nb_produit']);
    $query1 = query("DELETE FROM cart where id_product=$idp and id_user=$id");
    confirm($query1);
    redirect("../Public/checkout.php");
}

代码中仍然有一个功能来显示购物车中的产品（在表格中），但我需要先解决此问题）
我希望会话期间将数量和总计的值存储在数据库中，我们将不胜感激

Answer 1

我的更新查询语法有误，现在可以正常使用

如何使用会话变量更新数据库中的购物车？

1 个答案: