sql语句是
select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time
我如何在这条sql语句的基础上,查询出用户的用户名,积分。
或者如何在php中获取一下?
回复讨论(解决方案)
知道用户名么, 直接select 用户名,积分 from table where 用户名=用户名不就完事了么
??出表??。
SELECT * FORM ( select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分 from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time ) T WHERE username='XXX'
这种定义用户变量的写法还是很巧妙的
SELECT * FORM ( select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分 from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time ) T WHERE username='XXX'
这种定义用户变量的写法还是很巧妙的
SELECT * From ( select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分 from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time ) T WHERE username=18511337033'
这么写 ,加上where条件就会报错,没有where条件 就正常。
下面这是错误信息。
[SQL] SELECT * From ( select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分 from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time ) T WHERE username=18511337033'[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''' at line 6
这是表结构
SELECT * FORM ( select a.username,(@rowNum:=@rowNum+1) as c,a.integral as 积分 from xs_user a,(Select (@rowNum :=0 ) ) b order by integral DESC,time ) T WHERE username='XXX'
这种定义用户变量的写法还是很巧妙的
我看错了。。是我的自己的问题。。 sorry。。 3Q 谢谢了。

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

Atom editor mac version download
The most popular open source editor

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

Zend Studio 13.0.1
Powerful PHP integrated development environment

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