Backend Development
PHP Tutorial
Detailed explanation of the steps to use PDO transactions in PHP
Detailed explanation of the steps to use PDO transactions in PHP
This time I will bring you a detailed explanation of the steps for using PDO transactions in PHP. What are the precautions for using PDO transactions in PHP? Here are practical cases, let’s take a look.
Summary:
Treat multiple sql operations (addition, deletion, modification) as one operation unit, either all succeed or all fail.
No transaction processing is required for a single piece of data
The table being operated must be an innoDB type table (supporting transactions)
MySQL commonly used table types: MyISAM (non-transactional) addition, deletion and modification Fast speed, high security of InnodB (transactional)
Change the type of table to innoDB type
mysql> alter table stu engine=innodb;
Use:
Added on the basis of PDO preprocessing, in the following format:
try{
$m->beginTransaction();//开启事务处理
//PDO预处理以及执行语句...
$m->commit();//提交事务
}catch(PDOException $e){
$m->rollBack();//事务回滚
//相关错误处理
}Example:
$m = new PDO($dsn,$user,$pwd);
$m->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
try{
$m->beginTransaction();//开启事务处理
$stmt=$m->prepare("insert into stu(name,sex,age,classid)values(?,?,?,?)");
$data=array(
array("user1",1,22,"lamp76"),
array("user2",1,20,"lamp76"),
array("user3",0,22,"lamp76")
);
foreach($data as $v){
$stmt->execute($v);
echo $m->lastInsertId();
}
$m->commit();
echo "提交成功！";
}catch(PDOException $e){
$m->rollBack();//回滚
die("提交失败！");
}Supplementary: Come again An example analysis of mysql transaction processing and rollback operation using PDO
Overview:
Transaction (transaction) is composed of query and/or A sequence of update statements. Use begin, start transaction
to start a transaction, rollback to roll back the transaction, and commit to commit the transaction. After starting a transaction, there can be several SQL queries or update statements. After each SQL
is submitted for execution, there should also be statements to determine whether it is executed correctly to determine whether to roll back in the next step. If all are executed correctly, Finally commit the transaction.
Once the transaction is rolled back, the database will remain in the state before the transaction was started. Just like if an edited file is exited without saving, the original appearance of the file will naturally be retained.
So, a transaction can be regarded as an atomic operation, and the SQL in the transaction will either be executed entirely or not at all.
MYSQL transaction processing steps for PDO in PHP:
①.Turn off automatic submission
②.Enable transaction processing
③ .If there is an exception, it will automaticallythrow an exceptionprompt and then rollback
④.Turn on automatic submission
Note:
mysql Only this InnoDB driver supports transaction processing, and the default MyIsAM driver does not support it.
Example:
<?php
try{
//最后是关闭自动提交
$pdo=new pdo("mysql:host=localhost;dbname=mydb","root","root", array(PDO::ATTR_AUTOCOMMIT=>0));
//这个是通过设置属性方法进行关闭自动提交和上面的功能一样
//$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 0);
//开启异常处理
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e){
echo "数据库连接失败：".$e->getMessage();
exit;
}
/*
* 事务处理
*
* 张三从李四那里买了一台 2000 元的电脑
* 从张三帐号中扣出 2000元
* 向李四账号中加入 2000元
* 从商品表中减少一台电脑
* MyIsAM InnoDB
*/
try{
$pdo->beginTransaction();//开启事务处理
$price=500;
$sql="update zhanghao set price=price-{$price} where id=1";
$affected_rows=$pdo->exec($sql);
if(!$affected_rows)
throw new PDOException("张三转出失败");//那个错误抛出异常
$sql="update zhanghao set price=price+{$price} where id=3";
$affected_rows=$pdo->exec($sql);
if(!$affected_rows)
throw new PDOException("向李四转入失败");
echo "交易成功！";
$pdo->commit();//交易成功就提交
}catch(PDOException $e){
echo $e->getMessage();
$pdo->rollback();
}
//自动提交，如果最后不自动提交，转账是不成功的
$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,1);
//设置错误报告模式 ERRMODE_SILENT ERRMODE_WARNINGI believe you have read the case in this article After mastering the method, please pay attention to other related articles on the php Chinese website for more exciting content!
Recommended reading:
Detailed explanation of the steps of using curl to copy IP and refer in php
Detailed explanation of the steps of implementing message queue in PHP MySQL
The above is the detailed content of Detailed explanation of the steps to use PDO transactions in PHP. For more information, please follow other related articles on the PHP Chinese website!
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
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
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
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.
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,
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
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
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?
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.
