使用蓝图组建flask项目_使用蓝图组织一个小型falsk web

Flask本身是一个轻量级的框架，所以使用很方便，我们要学习的是flask蓝图，组建企业级项目。

但是如果需求很小，使用flask开发，完全没有必要遵照蓝图模式，搭建一堆文件。

 

1、配置文件 E:\code\flask\CompanyProject\config.py

import os
 
# basedir = os.path.dirname(__file__)
# print(basedir)
 
 
class Config:
    DEBUG = False
    SQLALCHEMY_DATABASE_URI = "sqlite:code/flask/CompanyProject/app/flask.db"
    SQLALCHEMY_TRACK_MODIFICATIONS = True
    SECRET_KEY = os.environ.get("SECRET_KEY") or 'hard to guess string'
    @staticmethod
    def init_app(app):
        pass
 
class Test(Config):
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = "sqlite:code/flask/CompanyProject/app/test.db"
 
class Run(Config):
    pass
 
config={
    "test":Test,
    "run":Run
}
 

2、初始化文件 E:\code\flask\CompanyProject\app\__init__.py

from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
from config import config
 
db = SQLAlchemy()
 
 
def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)
 
    db.init_app(app)
 
    from .main import main as main_blueprint
 
    app.register_blueprint(main_blueprint)
 
    return app

3、蓝图的初始化文件 E:\code\flask\CompanyProject\app\main\__init__.py

from flask import Blueprint
 
main = Blueprint("main", __name__)
from . import views, errors

 

4、注册蓝图 E:\code\flask\CompanyProject\app\__init__.py

5、编写视图文件 E:\code\flask\CompanyProject\app\main\views.py

from . import main
 
 
@main.route("/")
def index():
    return "hello world"
 

6、启动脚本编写 E:\code\flask\CompanyProject\manage.py

import os
from app import create_app, db
from app.models import *
from flask_script import Manager, Shell
from flask_migrate import MigrateCommand, Migrate
 
# os.getenv 获取环境变量，获取不到返回None
app = create_app(os.getenv("FLASK_CONFIG") or "test")
 
manager = Manager(app)
migrate = Migrate(app, db)
 
 
def make_shell_context():
    return dict(app=app, db=db, User=User, Type=Type)
 
 
def create_db():
    db.create_all()
    print("create success")
 
 
manager.add_command("shell", Shell(make_context=make_shell_context()))
manager.add_command("db", MigrateCommand)
 
if __name__ == '__main__':
    manager.run()

 

7、命令行相关操作

启动命令行，切换到当前项目所在的目录，并且激活环境

1、python manage.py runserver 启动服务

2、Python manage.py db init 实例化数据库

3、Python manage.py db migrate -m "initial migration" 生成数据库语句

4、Python manage.py db upgrade 同步数据库

5、Python manage.py shell 交互命令