在網盤下載領域，MySQL 數據庫是一種經典的解決方案。具有開源、高效、可靠、易用等特點。下面介紹一些在網盤下載方面使用 MySQL 的技術。

1、數據庫設計

CREATE TABLE file (
id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
owner_id INT UNSIGNED NOT NULL, 
name VARCHAR(255) NOT NULL,
size BIGINT UNSIGNED NOT NULL,
create_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
last_modified TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);
CREATE TABLE download (
id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
user_id INT UNSIGNED NOT NULL,
file_id INT UNSIGNED NOT NULL,
download_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

2、上傳文件

$fileSize = $_FILES['file']['Size'];
$fileName = $_FILES['file']['name'];
$ownerId = $_SESSION['user_id'];
$uploadTime = time();
$query="INSERT INTO file SET owner_id=$ownerId, name='$fileName', size=$fileSize, create_time='$uploadTime', last_modified='$uploadTime'";
//執行MySQL語句

3、下載文件

$fileId = $_GET['f'];
$userId = $_SESSION['user_id'];
$query = "SELECT * FROM file WHERE id=$fileId";
//執行MySQL查詢
$query = "INSERT INTO download SET user_id=$user_id, file_id=$file_id";
 //執行 MySQL 插入語句
$fileName = $row['name'];
$fileSize = $row['size'];
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=$fileName");
header("Content-Length: $fileSize");
readfile($filePath);

4、統計下載量

$fileId = $_GET['f'];
$query = "SELECT COUNT(*) AS count FROM download WHERE file_id=$fileId";
//執行 MySQL 查詢
$count = $row['count'];
echo "本文件已下載 $count 次";

總而言之，使用 MySQL 作為網盤下載的后臺數據庫，可以方便地存儲和管理文件信息和下載信息，提高用戶體驗和系統性能。