php读写mysql数据表

<?php
try {
    // 创建PDO实例
    $pdo = new PDO('mysql:host=localhost;dbname=testdb', 'username', 'password');

    // 设置错误模式为异常
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 插入数据
    $stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
    $stmt->bindParam(':name', $name);
    $stmt->bindParam(':email', $email);
    $name = 'John Doe';
    $email = 'john@example.com';
    $stmt->execute();

    // 读取数据
    $stmt = $pdo->query("SELECT * FROM users");
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        echo "ID: " . $row['id'] . " - Name: " . $row['name'] . " - Email: " . $row['email'] . "<br>";
    }
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}
?>

$stmt = $pdo->prepare("SELECT * FROM users WHERE id = :id");
$stmt->bindParam(':id', $id);
$id = $_GET['id'];
$stmt->execute();