假设有个用户发文章的场景。
一个用户表,一个类别表,一个文章表,文章表有个user_id关联用户表,一个category_id关联类别表。用mysql的数据库,没有做外键约束。
当用户发布一篇文章的时候,我需要去更新类别表的post_count字段,表示这个类别下有多少篇文章之类的。因为考虑到数据完整性要求不那么高,所以我这里没放在一个事务中去更新两张表的数据,而是分别去更新每张表的数据。
我希望能够在插入文章表之后就返回给客户端,创建成功的信息,断开与客户端的连接,然后再完成后续更新类别表的post_count字段。
lz之前是写python的,tornado框架就有个概念叫is_finish,标明当前与客户端的连接是否已经断开了,不知道codeinighter里面有没类似的概念呢?或者说怎么样主动断开与客户端的连接?
PS:lz也不知道这种不用事务的做法是不是不太合适,没真实在产品环境上跑过.....
回复内容:
假设有个用户发文章的场景。
一个用户表,一个类别表,一个文章表,文章表有个user_id关联用户表,一个category_id关联类别表。用mysql的数据库,没有做外键约束。
当用户发布一篇文章的时候,我需要去更新类别表的post_count字段,表示这个类别下有多少篇文章之类的。因为考虑到数据完整性要求不那么高,所以我这里没放在一个事务中去更新两张表的数据,而是分别去更新每张表的数据。
我希望能够在插入文章表之后就返回给客户端,创建成功的信息,断开与客户端的连接,然后再完成后续更新类别表的post_count字段。
lz之前是写python的,tornado框架就有个概念叫is_finish,标明当前与客户端的连接是否已经断开了,不知道codeinighter里面有没类似的概念呢?或者说怎么样主动断开与客户端的连接?
PS:lz也不知道这种不用事务的做法是不是不太合适,没真实在产品环境上跑过.....
http是无状态协议,PHP是URL驱动的脚本语言,没有守护进程,不支持异步。
用户访问一个PHP页面,一般情况下,Apache会单开一个进程来处理这个页面,处理完毕进程退出,nginx会发送一个请求给一个PHP守护进程,同样的,会新开一个进程或线程,处理完毕立刻退出。
如果想异步,可以用redis等存储队列、另开守护进程处理队列。
根据题主的情况,建议一次完成。
你说的应该是指返回数据后,php再继续在后台处理剩余数据,你这个需求在php中应该实现不了,php这门语言在http通信结束后,就会回收当前通信过程中使用到的所有局部变量,所以你这个需求很有可能实现不了。
其实你的这个需求是属于异步处理,这是node.js的强项。
水平不足,没看明白断开客户端连接的意思。
不过可以给你推荐两个ci的查询辅助函数,如下:
$this->db->insert_id()
执行数据插入时的ID,也就是返回插入成功后的ID$this->db->affected_rows()
当执行写入操作(insert,update等)的查询后,显示被影响的行数。
相关文档的链接在此:http://codeigniter.org.cn/user_guide/database/helpers.html
利用这两个函数应该足够确认插入数据成功了,希望能帮到你 : )

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.

In PHP, trait is suitable for situations where method reuse is required but not suitable for inheritance. 1) Trait allows multiplexing methods in classes to avoid multiple inheritance complexity. 2) When using trait, you need to pay attention to method conflicts, which can be resolved through the alternative and as keywords. 3) Overuse of trait should be avoided and its single responsibility should be maintained to optimize performance and improve code maintainability.

Dependency Injection Container (DIC) is a tool that manages and provides object dependencies for use in PHP projects. The main benefits of DIC include: 1. Decoupling, making components independent, and the code is easy to maintain and test; 2. Flexibility, easy to replace or modify dependencies; 3. Testability, convenient for injecting mock objects for unit testing.

SplFixedArray is a fixed-size array in PHP, suitable for scenarios where high performance and low memory usage are required. 1) It needs to specify the size when creating to avoid the overhead caused by dynamic adjustment. 2) Based on C language array, directly operates memory and fast access speed. 3) Suitable for large-scale data processing and memory-sensitive environments, but it needs to be used with caution because its size is fixed.

PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.

In JavaScript, you can use NullCoalescingOperator(??) and NullCoalescingAssignmentOperator(??=). 1.??Returns the first non-null or non-undefined operand. 2.??= Assign the variable to the value of the right operand, but only if the variable is null or undefined. These operators simplify code logic, improve readability and performance.


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