flask创建步骤
1.在__init__.py中创建db对象
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
2.同样的在__init__.py中create_app函数中让app传入到db中
def create_app():app = Flask(__name__)app.config.from_object('settings.DevelopmentConfig')app.register_blueprint(ac)app.register_blueprint(hm)db.init_app(app)Auth(app)return app
3.写配置文件,在settings中将连接字符串定义在配置文件中
class BaseConfig(object):# SESSION_TYPE = 'redis' # session类型为redis# SESSION_KEY_PREFIX = 'session:' # 保存到session中的值的前缀# SESSION_PERMANENT = True # 如果设置为False，则关闭浏览器session就失效。# SESSION_USE_SIGNER = False # 是否对发送到浏览器上 session:cookie值进行加密SQLALCHEMY_DATABASE_URI = "mysql+pymysql://root:123456@127.0.0.1:3306/s8day130db?charset=utf8"SQLALCHEMY_POOL_SIZE = 5SQLALCHEMY_POOL_TIMEOUT = 30SQLALCHEMY_POOL_RECYCLE = -1# 追踪对象的修改并且发送信号SQLALCHEMY_TRACK_MODIFICATIONS = FalseSECRET_KEY = "11111jfadfqaee"class ProductionConfig(BaseConfig):pass
4.定义models.py
#!/usr/bin/env python
# -*- coding:utf-8 -*-
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, UniqueConstraint, Index,DateTime,ForeignKey
from demo import dbclass Users(db.Model):__tablename__ = 'users'id = Column(Integer, primary_key=True,autoincrement=True)name = Column(String(32),nullable=False,unique=True)pwd = Column(String(32),nullable=False)
5.穿件数据库表,编写离线脚本:drop_create_table.py
from demoimport db
from demoimport create_app
from demoimport modelsapp = create_app()
with app.app_context():db.drop_all()db.create_all()# data = db.session.query(models.Users).all()# print(data)
6.在视图函数中使用sqlalchemy操作数据库
from demo import models
from demoimport db
ac = blueprints.Blueprint('ac',__name__)@ac.route('/login',methods=['GET','POST'])
def login():data = db.session.query(models.Users).all()db.session.commit()return "login"