1)总的比较
PDO | MySQLi | |
数据库支持 | 12种不同的数据库支持 | 支持MySQL |
API | OOP | OOP + 过程 |
Connection | Easy | Easy |
命名参数 | 支持 | 不支持 |
对象映射支持 | 支持 | 支持 |
预处理语句 (客户端) |
支持 | 不支持 |
性能 | 快 | 快 |
支持存储过程 | 支持 | 支持 |
2 连接方式
先来看下两者连接数据库的方式:
代码如下:
// PDO
$pdo = new PDO("mysql:host=localhost;dbname=database", 'username', 'password');
// mysqli, 面向过程方式
$mysqli = mysqli_connect('localhost','username','password','database');
// mysqli, 面向对象
$mysqli = new mysqli('localhost','username','password','database');
3 数据库支持
PDO支持多种数据库,但MYSQLI只支持MYSQL
4 命名参数name parameter
PDO的方式:
代码如下:
$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');
而MYSQLI则麻烦点,不支持这样,只能:
代码如下:
$query = $mysqli->prepare('
SELECT * FROM users
WHERE username = ?
AND email = ?
AND last_login > ?');
$query->bind_param('sss', 'test', $mail, time() - 3600);
$query->execute();
这样的话,一个个对问号的顺序,也比较麻烦,不大方便。
5 ORM映射的支持
比如有个类user,如下:
代码如下:
class User
{
public $id;
public $first_name;
public $last_name;
public function info()
{
return '#' . $this->id . ': ' . $this->first_name . ' ' . $this->last_name;
}
}
$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 $user->info() . "\n";
}
MYSQLI用面向过程的方式:
代码如下:
if ($result = mysqli_query($mysqli, $query)) {
while ($user = mysqli_fetch_object($result, 'User')) {
echo $user->info()."\n";
}
}
MYSQLI采用面向过程的方式:
代码如下:
// MySQLi, object oriented way
if ($result = $mysqli->query($query)) {
while ($user = $result->fetch_object('User')) {
echo $user->info()."\n";
}
}
6 防止SQL注入方面:
PDO 手工设置
代码如下:
$username = PDO::quote($_GET['username']);
$pdo->query("SELECT * FROM users WHERE username = $username");
使用mysqli
代码如下:
$username = mysqli_real_escape_string($_GET['username']);
$mysqli->query("SELECT * FROM users WHERE username = '$username'");
7 preparestament
PDO方式:
代码如下:
$pdo->prepare('SELECT * FROM users WHERE username = :username');
$pdo->execute(array(':username' => $_GET['username']));
MYSQLI:
代码如下:
$query = $mysqli->prepare('SELECT * FROM users WHERE username = ?');
$query->bind_param('s', $_GET['username']);
$query->execute();
小伙伴们是否通过本文对于PHP的2种链接方式PDO和mysqli有了新的认识了呢,希望本文能对大家有所帮助。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Dreamweaver Mac version
Visual web development tools