PHP を使用してオンライン教育機能を開発する方法

CREATE DATABASE online_education;
USE online_education;

CREATE TABLE courses (
    id INT AUTO_INCREMENT PRIMARY KEY,
    title VARCHAR(100),
    description TEXT,
    teacher_id INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE students (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50),
    email VARCHAR(50),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE teachers (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50),
    email VARCHAR(50),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

<?php
$servername = "localhost";
$username = "root";
$password = "your_password";
$database = "online_education";

// 创建连接
$conn = new mysqli($servername, $username, $password, $database);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

echo "成功连接到数据库";
?>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $title = $_POST["title"];
    $description = $_POST["description"];
    $teacher_id = $_POST["teacher_id"];

    $sql = "INSERT INTO courses (title, description, teacher_id) VALUES ('$title', '$description', $teacher_id)";

    if ($conn->query($sql) === TRUE) {
        echo "课程添加成功";
    } else {
        echo "添加课程失败: " . $conn->error;
    }
}
?>

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

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "课程标题: " . $row["title"] . "<br>";
        echo "课程描述: " . $row["description"] . "<br>";
        echo "教师姓名: " . getTeacherName($row["teacher_id"]) . "<br>";
        echo "<hr>";
    }
} else {
    echo "暂无课程";
}

function getTeacherName($teacher_id)
{
    global $conn;
    $sql = "SELECT name FROM teachers WHERE id = $teacher_id";
    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
        $row = $result->fetch_assoc();
        return $row["name"];
    } else {
        return "未知教师";
    }
}
?>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];

    $sql = "INSERT INTO students (name, email) VALUES ('$name', '$email')";

    if ($conn->query($sql) === TRUE) {
        echo "注册成功";
    } else {
        echo "注册失败: " . $conn->error;
    }
}
?>