PDO和Mysqli对比分析与归纳总结

100人浏览 2025-05-04 00:26:35

php操作mysql数据库，大家都知道有三种驱动，mysql mysqli pdo，其中mysql在php7之后被废除了。不是本文重点。咱现在来分析一下mysqli和PDO的区别，下面一张表用来说明他们的区别：

连接方式

// PDO
$pdo = new PDO("mysql:host=localhost;dbname=database", 'username', 'password');
 
// mysqli面向过程
$mysqli = mysqli_connect('localhost','username','password','database');
 
// mysqli面向对象
$mysqli = new mysqli('localhost','username','password','database');

对数据库的支持方面

pdo多种支持

代码表现

var_dump(PDO::getAvailableDrivers());

mysqli 单一

参数绑定

POD方式

$params = array(':username' => 'test', ':email' => $mail, ':last_login' => time() - 3600);
 
$pdo->prepare('
 SELECT * FROM users
 WHERE username = :username
 AND email = :email
 AND last_login > :last_login');
 
$pdo->execute($params);

mysqli方式
$query = $mysqli->prepare('
SELECT * FROM users
WHERE username = ?
AND email = ?
AND last_login > ?');
$query->bind_param('sss', 'test', $mail, time() - 3600);
$query->execute();

对象映射

假设我们有一个类，是如下这样

class User {
 public $id;
 public $first_name;
 public $last_name;
 
 public function info()
 {
 return '#'.$this->id.': '.$this->first_name.' '.$this->last_name;
 }
}

看看2者的方式

$query = "SELECT id, first_name, last_name FROM users";
 
// PDO
$result = $pdo->query($query);
$result->setFetchMode(PDO::FETCH_CLASS, 'User');
 
while ($user = $result->fetch()) {
 echo $user->info()."\n";
}
// MySQLI, procedural way
if ($result = mysqli_query($mysqli, $query)) {
 while ($user = mysqli_fetch_object($result, 'User')) {
 echo $user->info()."\n";
 }
}
// MySQLi, object oriented way
if ($result = $mysqli->query($query)) {
 while ($user = $result->fetch_object('User')) {
 echo $user->info()."\n";
 }
}

安全方面

二者都可以防止sql注入

看下代码

// PDO, "manual" escaping
$username = PDO::quote($_GET['username']);
 
$pdo->query("SELECT * FROM users WHERE username = $username");
 
// mysqli, "manual" escaping
$username = mysqli_real_escape_string($_GET['username']);
 
$mysqli->query("SELECT * FROM users WHERE username = '$username'");

预处理机制

// PDO, prepared statement
$pdo->prepare('SELECT * FROM users WHERE username = :username');
$pdo->execute(array(':username' => $_GET['username']));
 
// mysqli, prepared statements
$query = $mysqli->prepare('SELECT * FROM users WHERE username = ?');
$query->bind_param('s', $_GET['username']);
$query->execute();