How to adjust the database connection in PHP mall development?

With the development of the Internet and e-commerce, more and more companies and developers have begun to develop online malls. As a programming language widely used in the Internet field, PHP is also widely used in the development of shopping malls. When developing a PHP mall, database connection is a very important link. It is responsible for storing website data in the database and ensuring that the website can run normally. This article will introduce how to adjust the database connection in PHP mall development to ensure the smooth operation of the website.

1. Configure database connection information

When developing a PHP mall, we need to configure database connection information, including the database host name, user name, password, character encoding, etc. Before connecting to the database, we need to clearly write the value of each parameter in the PHP code. The following is some sample code:

// 数据库主机名
$servername = "localhost";

// 数据库用户名
$username = "root";

// 数据库密码
$password = "";

// 数据库名称
$dbname = "shop";

// 创建连接
$conn = mysqli_connect($servername, $username, $password, $dbname);

// 设置字符集
mysqli_set_charset($conn, 'utf8');

We can modify the values ​​of these parameters according to the actual situation to meet different needs.

2. Optimize database connection

When developing PHP mall, the performance of database connection is an issue that needs attention. For frequent database operations, it is more efficient to maintain a connection than to close the connection after each execution, because each connection requires a handshake operation. Therefore, we need to optimize the database connection in the code to avoid frequently creating and closing connections, but to keep the database connection open for a long time.

When implementing a long connection like this, we can use the following code:

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {

    die("连接失败: " . $conn->connect_error);
}

if (!$conn->set_charset("utf8")) {

    die("设置字符集失败: " . $conn->error);
}

This way, we can keep the connection open for a long time and avoid frequent connections and closing the database. At the same time, we also need to pay attention to closing the connection in time and adding code for connection exception handling.

3. Use the database connection pool

Under a large number of requests, the database connection pool can allow us to avoid repeated connections and closing the database, and improve code execution efficiency. We can encapsulate the connection pool in the code base. When we need to connect to the database, we can directly borrow a connection to use it. The code example is as follows:

$pool = new SwooleCoroutineChannel(10);

//线程启动时，初始化N个MySQL连接并放入到池中
for ($i = 0; $i < 10; $i++) {
    $conn = new mysqli($servername, $username, $password, $dbname);
    if ($conn->connect_errno) {
        throw new RuntimeException($conn->connect_error);
    }
    
    $pool->push($conn);
}

//从连接池中借用一个MySQL连接对象
$conn = $pool->pop();

//使用连接对象执行SQL语句
$retval = $conn->query($sql);

//SQL操作完成后将连接对象归还给连接池
$pool->push($conn);

By using the connection pool, we can greatly reduce the database connection overhead and greatly reduce the overhead and response time.

Summary:

When developing a PHP mall, database connection is a very important link. We need to pay attention to configuring database connection information, while optimizing database connections, using connection pools and other measures to ensure that the website can run quickly, efficiently and stably.

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