# 73 项目结构重构 ## exts.py ```text from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() ``` ## models.py ```text from exts import db class User(db.Model): __tablename__ = 'user' id = db.Column(db.Integer,primary_key=True,autoincrement=True) username = db.Column(db.String(50),nullable=False) ``` ## config.py ```text DB_USERNAME = 'root' DB_PASSWORD = '123456' DB_HOST = '127.0.0.1' DB_PORT = '3306' DB_NAME = 'flask_migrate_demo' DB_URI = 'mysql+pymysql://%s:%s@%s:%s/%s?charset=utf8' % (DB_USERNAME,DB_PASSWORD,DB_HOST,DB_PORT,DB_NAME) SQLALCHEMY_DATABASE_URI = DB_URI ``` ## myapp.py ```text from flask import Flask import config from exts import db app = Flask(__name__) app.config.from_object(config) # 获取app db.init_app(app) @app.route('/') def hello_world(): return 'Hello World!' @app.route("/profile/") def profile(): pass if __name__ == '__main__': app.run() ```