PHP开发技巧：如何使用Memcache缓存MySQL查询结果

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
?>

<?php
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭连接
$conn->close();
?>

<?php
// 检查缓存是否存在
if ($memcache->get('users') === false) {
    // 如果缓存不存在，从数据库查询数据
    $sql = "SELECT * FROM users";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
        // 将查询结果保存到Memcache缓存中，有效期为10分钟
        $memcache->set('users', $result->fetch_all(MYSQLI_ASSOC), 0, 600);
    }
}

// 从Memcache缓存中获取数据
$users = $memcache->get('users');

// 输出数据
foreach ($users as $user) {
    echo "ID: " . $user["id"]. " - Name: " . $user["name"]. "<br>";
}

// 关闭连接
$conn->close();
?>