问题4:生成php对应的api文件

2024/8/1 13:32:45

根据上面的数据库设计，编写对应的PHP代码实现全部的API效果。

2024/8/1 13:32:45

好的，下面是基于上述数据库设计编写的PHP代码，展示了如何实现全部的API效果。为了简洁起见，这里每个功能只展示了关键部分的代码。

### 项目结构
我们假设项目结构如下：

```
project/
│
├── api/
│   ├── database.php
│   ├── users.php
│   ├── classes.php
│   ├── courses.php
│   ├── videos.php
│   ├── tests.php
│   └── comments.php
├── .htaccess
└── index.php
```

### database.php
```php
<?php
class Database {
    private $host = 'localhost';
    private $db_name = 'educational_management';
    private $username = 'root';
    private $password = '';
    public $conn;

    public function getConnection() {
        $this->conn = null;
        try {
            $this->conn = new PDO("mysql:host={$this->host};dbname={$this->db_name}", $this->username, $this->password);
            $this->conn->exec("set names utf8");
        } catch(PDOException $exception) {
            echo "Connection error: " . $exception->getMessage();
        }
        return $this->conn;
    }
}
?>
```

### index.php
```php
<?php
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");

require_once 'api/database.php';

// Instantiate database
$database = new Database();
$db = $database->getConnection();

// Route requests based on the URL
$request = explode('/', trim($_SERVER['PATH_INFO'],'/'));
switch ($request[0]) {
    case 'users':
        include 'api/users.php';
        break;
    case 'classes':
        include 'api/classes.php';
        break;
    case 'courses':
        include 'api/courses.php';
        break;
    case 'videos':
        include 'api/videos.php';
        break;
    case 'tests':
        include 'api/tests.php';
        break;
    case 'comments':
        include 'api/comments.php';
        break;
    default:
        http_response_code(404);
        echo json_encode(array("message" => "Endpoint Not Found."));
        break;
}
?>
```

### users.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO users (username, password, email, role, avatar) VALUES (:username, :password, :email, :role, :avatar)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':username', $data->username);
    $stmt->bindParam(':password', $data->password);
    $stmt->bindParam(':email', $data->email);
    $stmt->bindParam(':role', $data->role);
    $stmt->bindParam(':avatar', $data->avatar);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "User was created."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to create user."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM users";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $users = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($users);
}
?>
```

### classes.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO classes (class_name, description, semester) VALUES (:class_name, :description, :semester)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':class_name', $data->class_name);
    $stmt->bindParam(':description', $data->description);
    $stmt->bindParam(':semester', $data->semester);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "Class was created."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to create class."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM classes";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $classes = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($classes);
}
?>
```

### courses.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO courses (course_name, description, syllabus) VALUES (:course_name, :description, :syllabus)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':course_name', $data->course_name);
    $stmt->bindParam(':description', $data->description);
    $stmt->bindParam(':syllabus', $data->syllabus);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "Course was created."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to create course."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM courses";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $courses = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($courses);
}
?>
```

### videos.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO videos (course_id, title, description, url) VALUES (:course_id, :title, :description, :url)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':course_id', $data->course_id);
    $stmt->bindParam(':title', $data->title);
    $stmt->bindParam(':description', $data->description);
    $stmt->bindParam(':url', $data->url);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "Video was uploaded."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to upload video."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM videos";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $videos = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($videos);
}
?>
```

### tests.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO tests (course_id, question, answer, type) VALUES (:course_id, :question, :answer, :type)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':course_id', $data->course_id);
    $stmt->bindParam(':question', $data->question);
    $stmt->bindParam(':answer', $data->answer);
    $stmt->bindParam(':type', $data->type);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "Test was created."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to create test."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM tests";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $tests = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($tests);
}
?>
```

### comments.php
```php
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $data = json_decode(file_get_contents("php://input"));
    
    $query = "INSERT INTO comments (course_id, user_id, content) VALUES (:course_id, :user_id, :content)";
    $stmt = $db->prepare($query);

    $stmt->bindParam(':course_id', $data->course_id);
    $stmt->bindParam(':user_id', $data->user_id);
    $stmt->bindParam(':content', $data->content);

    if($stmt->execute()) {
        http_response_code(201);
        echo json_encode(array("message" => "Comment was added."));
    } else {
        http_response_code(503);
        echo json_encode(array("message" => "Unable to add comment."));
    }
} elseif ($_SERVER['REQUEST_METHOD'] == 'GET') {
    $query = "SELECT * FROM comments";
    $stmt = $db->prepare($query);
    $stmt->execute();
    $comments = $stmt->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($comments);
}
?>
```

### .htaccess
为了支持URL重写，将所有请求重定向到 `index.php`：

```
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [QSA,L]
```

这段代码只是一个简单的示例，不包括所有可能的错误处理、验证和安全措施。在实际生产环境中，请确保为输入数据进行适当的验证，并使用准备好的语句以防止SQL注入等攻击。