php留言板连接数据库

<?php
// 数据库配置
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 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);
}

// 插入留言
$sql = "INSERT INTO messages (name, message) VALUES ('John Doe', 'Hello World')";
if ($conn->query($sql) === TRUE) {
    echo "留言插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 查询留言
$sql = "SELECT id, name, message FROM messages";
$result = $conn->query($sql);

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

// 关闭连接
$conn->close();
?>