SQL 带回滚的事务内查询插入检查

Question

在我的商店系统中，我使用此代码在数据库中插入客户订单详细信息以及属于该订单的产品 o:

$connection->beginTransaction();
try
{
    $sql = "INSERT INTO orders (customer_id, order_price, order_date, order_hour)
            VALUES (?, ?, ?, ?)";

    $query = $connection->prepare($sql);
    $query->execute(array
    (
        $user['user_id'],
        $order_price,
        $date,
        $hour
    ));

    if($query)
    {
        $id_of_respective_order = $connection->lastInsertId();

        $sql = "INSERT INTO purchased_products (order_id, product_name, product_price, quantity, extras)
                VALUES (?, ?, ?, ?, ?)";

        $query = $connection->prepare($sql);

        foreach($_SESSION['cart'] as $product)
        {
            $extras = null;
            $product_price = $product['product_price'] * $product['quantity'];

            if($product['extras'] != NULL)
            {
                foreach($product['extras'] as $extra)
                {
                    $extras .= $extra['extra_quantity'] ."x". $extra['extra_name'] ."<br/>";
                    $product_price += $extra['extra_total'] * $product['quantity'];
                }
            }

            $query->execute(array
            (
                $id_of_respective_order,
                $product['product_name'],
                $product_price,
                $product['quantity'],
                $extras
            ));
        }

        unset($_SESSION['cart']);

        echo "<script>alert('Your purchase was completed!');
        window.location = '/my-orders.php';
        </script>";
    }
    else
    {
        echo "<script>alert('An error ocurred while completing your purchase. Please try again!');
        window.location = '/my-cart.php';</script>";
    }
    $connection->commit();
}
catch(PDOException $exception) 
{
    $connection->rollBack();
    echo "<script>alert('An error ocurred while completing your purchase. Please try again!');
    window.location = '/my-cart.php';</script>";
}

我的问题是关于错误检查的代码优化。建议我使用 if ($query) 即使 catch 和 rollBack 就像我在做的那样？这是必要的，或者我只能使用 catch 和 rollBack 因为它会自己检查错误？

Answer 1

如果您将 PDO 错误设置为抛出异常，则无需使用 if。

$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

SQL 带回滚的事务内查询插入检查

SQL Query insertion check inside transaction with rollback

php

mysql

pdo