php搜索mysql数据库

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

    // 执行查询
    $stmt = $pdo->query('SELECT * FROM users');
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        echo 'ID: ' . $row['id'] . ', Name: ' . $row['name'] . '<br>';
    }
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}
?>

try {
    $pdo = new PDO('mysql:host=localhost;dbname=testdb', 'username', 'password');
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

try {
    $stmt = $pdo->query('SELECT * FROM users');
} catch (PDOException $e) {
    echo 'Query failed: ' . $e->getMessage();
}

try {
    $stmt = $pdo->prepare('INSERT INTO users (name, email) VALUES (:name, :email)');
    $stmt->bindParam(':name', $name);
    $stmt->bindParam(':email', $email);
    $stmt->execute();
} catch (PDOException $e) {
    echo 'Insert failed: ' . $e->getMessage();
}