You are already in Windows It's finished Pycharm Integrated development tools +Python3.6 Version of and related third-party packages
Step1： Whole 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： Effect of visiting the home page after service startup
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>
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