php mysql制作留言板

CREATE DATABASE message_board;
USE message_board;

CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255),
    email VARCHAR(255),
    message TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

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

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

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "SELECT id, name, message, created_at FROM messages ORDER BY created_at DESC";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "<div>";
        echo "<strong>" . htmlspecialchars($row["name"]) . "</strong> (" . htmlspecialchars($row["created_at"]) . "): ";
        echo nl2br(htmlspecialchars($row["message"]));
        echo "</div>";
    }
} else {
    echo "还没有留言。";
}
$conn->close();
?>

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

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

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];

$sql = "INSERT INTO messages (name, email, message) VALUES (?, ?, ?)";
$stmt = $conn->prepare($sql);
$stmt->bind_param("sss", $name, $email, $message);

if ($stmt->execute()) {
    header("Location: index.php");
} else {
    echo "Error: " . $stmt->error;
}

$stmt->close();
$conn->close();
?>

<form action="add_message.php" method="post">
    <input type="text" name="name" placeholder="你的名字" required>
    <input type="email" name="email" placeholder="你的邮箱" required>
    <textarea name="message" placeholder="你的留言" required></textarea>
    <button type="submit">提交</button>
</form>