Analysis of shopping cart data cleaning and optimization strategies developed with PHP

Analysis of mall shopping cart data cleaning and optimization strategies developed with PHP

Introduction:
With the development of e-commerce, mall shopping carts have become an indispensable part of users' online shopping process. The shopping cart is a container that temporarily stores items selected by the user. However, the data in the shopping cart will continue to accumulate with the user's operations, which may cause the database to be overloaded and affect website performance. Therefore, it is very important to clean and optimize shopping cart data. This article will discuss data cleaning and optimization strategies for shopping carts developed using PHP, and provide code examples.

1. Shopping cart data cleaning strategy

1. Expired product cleaning: The products in the shopping cart may have expired because the user has not completed the purchase for a long time. There is no need to keep them in the shopping cart. . We can set an expiration time, such as 7 days, and regularly clear expired product data in the shopping cart.

Code example:

// 获取过期时间
$expireTime = time() - (7 * 24 * 3600); 

// 查询购物车中过期的商品
$sql = "DELETE FROM shopping_cart WHERE expiry_time < $expireTime";
$result = mysqli_query($conn, $sql);
if (!$result) {
    echo "清理购物车失败：" . mysqli_error($conn);
} else {
    echo "成功清理购物车中过期的商品";
}

2. Invalid product cleaning: Sometimes after the product is removed from the shelves or deleted, these invalid products may still exist in the user's shopping cart. In order to ensure that the items in the shopping cart are all sellable items, you can regularly check whether there are invalid items in the shopping cart and clean them.

Code example:

// 查询购物车中无效的商品
$sql = "DELETE FROM shopping_cart WHERE NOT EXISTS (SELECT 1 FROM products WHERE shopping_cart.product_id = products.id)";
$result = mysqli_query($conn, $sql);
if (!$result) {
    echo "清理购物车失败：" . mysqli_error($conn);
} else {
    echo "成功清理购物车中无效的商品";
}

2. Shopping cart data optimization strategy

1. Merge the same product: There may be multiple additions of the same product to the shopping cart Condition. In order to reduce the number of database queries and the number of items in the shopping cart, the quantities of the same items can be merged into one record.

Code example:

// 合并购物车中相同的商品
$sql = "SELECT product_id, SUM(quantity) AS total_quantity FROM shopping_cart GROUP BY product_id";
$result = mysqli_query($conn, $sql);
while ($row = mysqli_fetch_assoc($result)) {
    $productId = $row['product_id'];
    $totalQuantity = $row['total_quantity'];
    
    // 更新购物车中商品数量
    $sqlUpdate = "UPDATE shopping_cart SET quantity = $totalQuantity WHERE product_id = $productId";
    mysqli_query($conn, $sqlUpdate);
}

echo "成功合并购物车中相同的商品";

2. Data caching: Shopping cart data may be read and written multiple times during user operations, and frequent database operations will cause performance degradation. You can consider using a caching mechanism to temporarily store shopping cart data in memory to reduce the number of database accesses.

Code example:

// 存储购物车数据至缓存中
if (!$cartData = getFromCache('shopping_cart')) {
    $sql = "SELECT * FROM shopping_cart WHERE user_id = $userId";
    $result = mysqli_query($conn, $sql);
    $cartData = [];
    while ($row = mysqli_fetch_assoc($result)) {
        $cartData[] = $row;
    }
    saveToCache('shopping_cart', $cartData);
}

// 从缓存中读取购物车数据
function getFromCache($key) {
    // 从缓存中获取数据
    // ...
    return $data;
}

// 将购物车数据存储至缓存中
function saveToCache($key, $data) {
    // 将数据存储至缓存中
    // ...
}

Conclusion:
The cleaning and optimization of shopping cart data are crucial to the performance and user experience of the mall website. By regularly cleaning up expired or invalid products, merging the same products and using the caching mechanism, the database load can be effectively reduced and website performance improved. Through the strategy analysis and code examples of this article, I hope it can inspire developers who use the PHP Developer Mall shopping cart.

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