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Flask lightweight web framework

2022-07-04 17:45:00 【Wu_ Candy】

【 precondition ： You are already in windows It's finished Pycharm Integrated development tools +python3.6 Version of and related third-party packages 】

Step1： Go directly to the full picture of the frame

Step2： Structural description of the frame

Project structure

- manage.py Used to control the program python manage.py runserver # Start service command python manage.py shell # Get into shell Script mode commands - app/__init__ Initialization file Initialize the whole Flask object , as well as Flask Various plug-ins used , And return a app application - app/settings Project profile Configure the entire project operation environment - app/ext Extension library of the project Third party extension library packaging - app/views The view function Process business logic Coordinate the relationship between modules and models - app/models Model Define the model structure Get the relational mapping of the tables in the database db.create_all() Create database db.drop_all() Delete database - doc Framework description document - static Directory for storing static resources - templates The directory used to store template resources - migrations Migration Directory

Data migration

- Map the model to the database - Use flask-migrate library - Installation and use pip install flask-migrate initialization , Need to use app and db To initialize ,migrate=Migrate(app,db) To configure flask-script The order of manager.add_command('db',MigrateCommand)

- Instructions to use python manage.py db init init Initialization instruction , Can only be called once python manage.py db migrate migrate Instructions are used to generate migration files Internal migration files use linked lists to associate relationships --message MSG Add log description for migration python manage.py db upgrade upgrade Instructions are used to execute migration files Database content upgrade python manage.py db downgrade downgrade Instructions are used to execute migration files Database content degradation , Equivalent to regret medicine

- help Help document

Step3： The general call logic is as follows

<1> App/views.py The file introduces models.py【 Model objects in the model package 】andext.py【 In the expansion package db object 】

<2> App/__init__.py The file introduces views.py【 The blueprint in the view package 】,ext.py【 Introduce the expansion package and do initialization work in the expansion package 】,settings.py【 Introduce the setting package and do the database connection, environment configuration and resource directory settings 】. Finally, initialization is completed app After the application , Return to one app application .

<3> manage.py It's the entry file , Get the one returned in the previous step app application , Finally, start the service .

Step4： After the service is started, the effect of visiting the home page is

Step5： For the above figure, see the source code of routing and page

In fact, it is to render Templates/home.html page

App/views.py:

@blue.route('/index/',methods=['GET','POST']) def index(): return render_template('home.html')

The page is mainly the two links of login and exit

Templates/home.html The page source code is ：

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h2>welcome back:{{ username }}</h2> <a href="{{ url_for('second_blue.login') }}">login</a> <a href="{{ url_for('second_blue.logout') }}">logout</a> </body> <html>

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