从数据库中查询的请求失败
求助:从数据库中查询的请求失败?
新手,第一次做新闻发布,在新闻浏览界面的时候出现了问题
以下是在网上看到的一种写法
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> include "connect.php"; $id=$_GET["id"]; $query="SELECT * from news Where id=".$id; $result=mysql_query($query,$conn); $row=mysql_fetch_array($result);
报错是 Warning: mysql_fetch_array() expects parameter 1 to be resource
其实我对这个写法中得变量id不甚理解,为什么新定义的一个变量能拿来和数据库表中的id比较呢?
怎样改这个错误呢?
谢谢~~
------解决方案--------------------
加一行, echo mysql_error();
估计八成是news表不存在怎的
------解决方案--------------------
1.跟楼上说的一样,mysql_error()看一下
2.$id变量是用来接收页面通过get传递的值,你的网页地址应该是:http://xxx.com?id=1,这里id值1就是要获取的值,通过这个id值跟数据表对比来获得新闻列表
3.你可以把connect.php贴出来看一下
------解决方案--------------------
你把你的sql在mysql编辑器调式看看,你的代码应该没什么问题。就是不知道你连接数据库的代码是否有毛病。
------解决方案--------------------
其实楼主已经说的很清楚了
------解决方案--------------------
------解决方案--------------------
友情提醒下...在正式的开发工作中,如果对传入的参数不进行正确性检查的话....后果将是毁灭性的...
$_GET 和 $_POST获得的原始数据,不能直接拼接在sql中...必须进行正确性检查,这是常识...
------解决方案--------------------

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











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.

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.

The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

Abstract of the first paragraph of the article: When choosing software to develop Yi framework applications, multiple factors need to be considered. While native mobile application development tools such as XCode and Android Studio can provide strong control and flexibility, cross-platform frameworks such as React Native and Flutter are becoming increasingly popular with the benefits of being able to deploy to multiple platforms at once. For developers new to mobile development, low-code or no-code platforms such as AppSheet and Glide can quickly and easily build applications. Additionally, cloud service providers such as AWS Amplify and Firebase provide comprehensive tools

SQL is a standard language for managing relational databases, while MySQL is a database management system that uses SQL. SQL defines ways to interact with a database, including CRUD operations, while MySQL implements the SQL standard and provides additional features such as stored procedures and triggers.
