PHP高并发处理中的数据库读写优化技巧

// 初始化连接池
$dbPool = new SplQueue();
for ($i = 0; $i < 10; $i++) {
    $conn = new mysqli("localhost", "username", "password", "database");
    if ($conn->connect_error) {
        die("连接数据库失败：".$conn->connect_error);
    } else {
        $dbPool->enqueue($conn);
    }
}

// 从连接池中获取连接
$conn = $dbPool->dequeue();

// 执行数据库操作
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

// 将连接放回连接池
$dbPool->enqueue($conn);

// 开启数据库连接持久化
$mysqli = new mysqli('p:localhost', 'username', 'password', 'database');

// 执行数据库操作
$sql = "SELECT * FROM users";
$result = $mysqli->query($sql);

// 主数据库连接
$masterConn = new mysqli("localhost", "master_username", "master_password", "database");

// 从数据库连接
$slaveConn = new mysqli("localhost", "slave_username", "slave_password", "database");

// 执行数据库写入操作
$sql = "INSERT INTO users (name, age) VALUES ('John', 18)";
$masterConn->query($sql);

// 执行数据库读取操作
$sql = "SELECT * FROM users";
$result = $slaveConn->query($sql);

// 从缓存中读取数据
$cacheKey = 'user_list';
if ($cache->exists($cacheKey)) {
    $userList = $cache->get($cacheKey);
} else {
    $sql = "SELECT * FROM users";
    $result = $conn->query($sql);
    $userList = $result->fetch_all(MYSQLI_ASSOC);
  
    // 将数据放入缓存
    $cache->set($cacheKey, $userList);
}