Home Backend Development PHP Problem What is PDO in PHP? What are the common ways to use pdo objects?

What is PDO in PHP? What are the common ways to use pdo objects?

Jun 29, 2021 pm 04:17 PM
pdo php

我们学习了解了这么多关于PHP的知识,不知道你们对PHP中PDO是什么?pdo对象的使用常见方法是什么?是否已经完全掌握了呢,如果没有,那就跟随本篇文章一起继续学习吧

相关推荐:php中如何调用存储函数?调用存储过程?其中触发器是什么?

PDO是什么?

PDO是别人写的“数据库操作工具类”!—一它可以代替我们自己写的MySQLDB.class.php.使用它,类似这样:

1

2

3

Spdo = new PDO(连接信息);ssql = "select " from .....";

Sresult = Spdo->query(Ssql);l/返回一个“pdo结果集”﹔$sql = "delete / update / insert.......""。

Sresult2 = Spdo->exec(Ssql);l/返回一个真假值﹔

Copy after login

手册可以找到:

函数参考》数据库扩展》数据库抽象层>PDO ,

具体应用的时候,其实,其中有这样的一个关系;

What is PDO in PHP? What are the common ways to use pdo objects?

即,要操作某种数据,就得去“打开”对应的pdo引擎。pdo引擎,在哪里打开?

——在phpini的配置文件中,无非就是一个“模块”而已,如下:

What is PDO in PHP? What are the common ways to use pdo objects?

当然,也得重启apache;

使用pdo连接mysql数据库:

1

2

3

$DSN = "mysql: host=服务器地址/名称: port=端口号; dbname=数据库名"

$0pt = array(PDd::MYsQL_ATTR_INIT_COMMAND=>’set names连接编码’);

$pdo = new pdo(SDSN,"用户名""密码"$opt);

Copy after login

pdo对象的使用(常见方法)

1

$result = Spdo->query("返回结果集的 sq1语句"");

Copy after login

结果:

成功:就是一个pdo结果集对象<后续马上学习〉,失败:false ,

1

Sresult = Spdo->exec("增删改的 sq1语句"");

Copy after login

结果: true<表示成功〉,false<表示失败>﹔

其他操作:

1

. $pdo->lastInsertId) ;

Copy after login

获取最后添加的id值

1

. spdo->beginTransaction() ;

Copy after login

开启一个事务

1

. $pdo->commit();

Copy after login

提交一个事务

1

. spdo->rollBack() ;

Copy after login

回滚一个事务

1

. $pdo->inTransaction();

Copy after login

判断当前行是否在事务中,返回true/false

.$pdo->setAttribute(属性名,属性值);

设置pdo对象的属性值;

1

举例:$pdo->setAttribute(PDO::ATTR_ERRMOOE,PDO:ERRMOOE_EXCEPTIOM)

Copy after login

推荐学习:《PHP视频教程

The above is the detailed content of What is PDO in PHP? What are the common ways to use pdo objects?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

7 PHP Functions I Regret I Didn't Know Before 7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

See all articles