Backend Development
PHP Tutorial
mysql - PHP中 PDO 的错误模式,ERRMODE_EXCEPTION 和 ERRMODE_WARNING 区别是什么?
mysql - PHP中 PDO 的错误模式,ERRMODE_EXCEPTION 和 ERRMODE_WARNING 区别是什么?
PDO::ERRMODE_EXCEPTION PDO::ERRMODE_WARNING 区别是什么?
我怎么看了以后,觉得这俩除了反馈信息的格式不一样外,别的看起来都一样?
就是讲解的时候有个"抛出"一词,谁可以简单的跟我说说什么区别?
回复内容：
PDO::ERRMODE_EXCEPTION PDO::ERRMODE_WARNING 区别是什么?
我怎么看了以后,觉得这俩除了反馈信息的格式不一样外,别的看起来都一样?
就是讲解的时候有个"抛出"一词,谁可以简单的跟我说说什么区别?
错误模式说明:
异常模式:
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
这个模式需要配合 try 使用 :
一旦出错,就会:
创建一个对象,$e 也可以随便命名,从 $e->getMessage() 获取错误信息;
采取动作;
<code>try{
要执行的命令...
}catch(PDOException $e){
echo "执行命令失败：".$e->getMessage();
失败后的动作...
}</code>这个其实等于 缺省模式的 if($pdo->errorInfo()[2]) ...
创建PDO的时候,为什么也用 try?
因为这时候连PDO对象都没有,所以也不能设置错误模式,所以可以用try,
一旦PDO创建成功,错误模式就成了 缺省模式,也就不能用try了.
缺省模式:
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
这个出错,会给 $pdo->errorCode() 和 $pdo->errorInfo()[2] 赋值;
可以用 if($pdo->errorInfo()[2])和if($pdo->errorCode()) 判断脚本是不是出错.
如果不出错,上面都是空的;
警告模式:
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
这个会echo出一个错误信息,打乱了脚本;
学习调试的时候使用比较好;
真用起来的时候,很多时候判断不出到底脚本有没有出错;
请注意PHP的错误等级一文。
Warning级别的错误，会直接显示在页面上，且无法自行根据错误处理相关的业务逻辑。Exception则是抛出一个可以被捕获的Exception对象，可以获取到详细的异常信息。
<code>try {
$stmt = $pdo->prepare("select * from id = :id");
// PGSQL严格限制数据类型，serial字段使用字符串字段进行匹配将会出错
$stmt->bindValue(':id','string',PDO::PARAM_STR);
$stmt->execute();
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} catch (PDOException $e) {
// PDO执行出错时执行
// 可以捕获到PDO抛出的异常，可以获取到详细的错误代码，错误描述，哪个文件第几行出错，本次请求中所有执行的文件等等
var_dump($e);
}</code>
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 and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
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.
Choosing Between PHP and Python: A Guide
Apr 18, 2025 am 12:24 AM
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.
MySQL's Role: Databases in Web Applications
Apr 17, 2025 am 12:23 AM
The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.
Laravel Introduction Example
Apr 18, 2025 pm 12:45 PM
Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.
PHP and Python: A Deep Dive into Their History
Apr 18, 2025 am 12:25 AM
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 vs. Python: Use Cases and Applications
Apr 17, 2025 am 12:23 AM
PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.
Solve database connection problem: a practical case of using minii/db library
Apr 18, 2025 am 07:09 AM
I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.
PHP's Impact: Web Development and Beyond
Apr 18, 2025 am 12:10 AM
PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
