How to perform data caching and data preheating in the PHP flash sale system

How to cache and warm up data in PHP flash sale system

With the rapid development of the Internet, e-commerce platforms widely use flash sale systems in specific promotional activities to attract users and increase sales. In a high-concurrency environment, in order to ensure the performance and stability of the flash sale system, data caching and data preheating have become indispensable links.

Data caching refers to storing frequently accessed data in a cache that can be read quickly, instead of querying the database every time. Data warm-up refers to loading popular data into the cache in advance to reduce the load pressure on the system during peak periods. This article will introduce how to perform data caching and data preheating in the PHP flash sale system, and provide specific code examples.

1. Using caching technology
   In the PHP flash sale system, caching technology can be used to speed up data access. Common caching technologies include Redis and Memcached. The following is a sample code for using Redis to implement data caching:

// 连接Redis服务器
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 查询商品信息
$productId = 1;
$key = 'product:' . $productId;
$product = $redis->get($key);

if (!$product) {
    // 从数据库中获取商品信息
    $product = getProductFromDatabase($productId);

    // 将商品信息存入Redis，并设置过期时间
    $redis->setex($key, 3600, $product);
}

2. Data warm-up
   In the flash sale system, in order to improve the user's snap-up experience, information about popular products can be stored in advance Load into cache to avoid frequent database access during peak periods. The following is a sample code to implement data preheating:

// 预热商品信息
$preheatProducts = [1, 2, 3];  // 假设有三个热门商品

foreach ($preheatProducts as $productId) {
    $key = 'product:' . $productId;
    $product = $redis->get($key);

    if (!$product) {
        // 从数据库中获取商品信息
        $product = getProductFromDatabase($productId);

        // 将商品信息存入Redis，并设置过期时间
        $redis->setex($key, 3600, $product);
    }
}

3. Set the cache expiration time
   In order to prevent users from still getting expired data from the cache after the cached data expires, you can set The cache expiration time. In the above example code, we set the expiration time of product data to 3600 seconds (1 hour), and you can adjust it according to actual needs.

Summary:
The performance and stability of the PHP flash sale system can be effectively improved through data caching and data preheating. Using caching technology can speed up data access and improve system response performance; through data preheating, you can avoid frequent database access during high concurrency and reduce system load pressure. In actual development, you can choose appropriate caching technology according to business needs, and combine it with scheduled tasks or event triggering mechanisms to update and warm up data.

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