数据表名所变(有规律的多了一个相同的前缀),系统一定要修改sql语句吗?
原系统的sql形如:
select * from 'table';
今天上线后,才知道:
由于其他原因(这里就不提了)。
所有的数据表一定要改名子,要统一把所有的数据表,加上前缀,就是加上一个"nbx_table"
我应该怎么办?
第一,把系统再改一遍吗?也太麻烦了吧?
第二,怎么可以防止下次不这样?
第三,一些cms这样写有什么好处:
$this->FLInfos = $this->dsql->GetOne("SELECT * FROM `#@__freelist` WHERE aid='$fid' ");
回复讨论(解决方案)
一些开源项目(CMS、BLOG、Wiki、框架...)给数据表加上前缀的原因是:
防止与其他应用系统发生冲突!
租用的空间都不能自行创建数据库,当在空间中放入两个及以上项目时,表名是极易发生冲突的。
第一,把系统再改一遍吗?也太麻烦了吧?
这个取决于你是怎么去访问数据库的,例如Hibernate和MyBatis不需要修改源代码,直接去修改映射文件就可以。
如果你是用JDBC在源码里写死了SQL语句,这个没办法,只能坑次坑次的去修改源码里的SQL语句了。
第二,怎么可以防止下次不这样?
尽量使用MyBatis与Hibernate等数据库持久层框架。
第三,一些cms这样写有什么好处:"SELECT * FROM `#@__freelist` WHERE aid='$fid' "
仔细看这个SQL,里面#@__freelist等前面有一个标志,这个其实就是最后生成SQL语句时要被替换成配置文件里指定的变量,正好可以解决你的这种问题。

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











In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

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 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 is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

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.

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

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 suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
