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context There are two contexts in the flash project, one is the application context (web), the other is the request context (request), the request context request and the application context current_app is A global variable, and all requests are shared. Flask has A special mechanism to ensure that the data of each request is isolated, that ...

Relational mapping The relational mapping in the database can be one-to-one, one to many and many to many. 1, One on one When two tables have a one-to-one relationship, define a foreign key inside any model class. Create a one-to-one mapping: class A(models.Model): pass class B(models.Model): a=models.OneToOneField(A,on_delete=***) Aft ...

Display of small tourism projects The project adopts Vant UI as the UI of the project. The rapid prototyping interface, Vant's official address: https://vant-contrib.gitee.io/vant/#/zh-CN/home The front-end page is formed by Vue cli, and the back-end relies on Django and uses Api communication to complete it quickly Front page display Mai ...

When Django is used for front-end and back-end separation development, it is usually combined with Django rest framework to create RESTful interface API. For framework introduction and version requirements, please refer to the official address: https://www.django-rest-framework.org This article takes creating an API containing name and sex f ...

1, Introduction to Django framework Refer to official documents: Django official documents https://docs.djangoproject.com/zh-hans/3.2/ 2, Create the first Django project Create a new project - > select Django Django will be installed automatically If the network speed is too slow, you need to modify the pip source Modify pip sour ...

2, Django uses the jinja2 template 2.1 jinja2 introduction Jinja2: it is the next widely used template engine in Python. It is a template language implemented by python. Its design idea comes from Django's template engine and extends its syntax and a series of powerful functions, especially the built-in template language in Flask framework ...

1, Create project The project is based on GitHub Hosting websites for source code 1. Create a remote repository of source code: blog 2. Clone remote warehouse Note: git needs to be installed. Enter "git" on the windows terminal to test the environment Note: you need to install the virtual environment (pyt ...

Dashboard – horizon installation This section describes how to install and configure a dashboard on a controller node. The only core service required for dashboards is identity services. You can use dashboards with other services, such as image services, computing, and networking. You can also use dashboards in environments with stand-a ...

2.4 use optimistic lock to place orders concurrently Important: When multiple users initiate an order request for the same commodity at the same time, first query the commodity inventory and then modify the commodity inventory, there will be resource competition, resulting in abnormal final results of inventory. 2.4.1. Concurrent order probl ...

1. New Django project At the end of the Location is the Django project name, and select the virtual environment In More Setting, you can select the template language and enter the APP name in Application name. If you do not enter the APP name, the new project does not contain APP by default. After the project is completed, you can use the co ...