Flask的flask-sqlalchemy

flask-sqlalchemy是Flask和SQLAlchemy的管理者

- db = SQLAlchemy()
　　- 包含配置
　　- 包含ORM基类
　　- 包含create_all
　　- engine
　　- 创建连接

举例：

views中的account.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-

from flask import Blueprint
from .. import db
from .. import models

account = Blueprint('account', __name__)


@account.route('/login')
def login():
    # 添加示例
    """
    db.session.add(models.Users(username='alex', pwd='123', gender=1))
    db.session.commit()

    obj = db.session.query(models.Users).filter(models.Users.id == 1).first()
    print(obj)

    PS: db.session和db.create_session
    """
    # db.session.add(models.Users(username='wupeiqi1', email='[email protected]'))
    # db.session.commit()
    # db.session.close()
    #
    # db.session.add(models.Users(username='wupeiqi2', email='[email protected]'))
    # db.session.commit()
    # db.session.close()
    # db.session.add(models.Users(username='alex1',email='[email protected]'))
    # db.session.commit()
    # db.session.close()



    user_list = db.session.query(models.Users).all()
    db.session.close()
    for item in user_list:
        print(item.username)


    return 'login'

__init__.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()

from .models import *
from .views import account

def create_app():
    app = Flask(__name__)
    app.config.from_object('settings.DevelopmentConfig')

    # 将db注册到app中
    db.init_app(app)

    # 注册蓝图
    app.register_blueprint(account.account)


    return app

models.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from . import db


class Users(db.Model):
    """
    用户表
    """
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)

    def __repr__(self):
        return '<User %r>' % self.username

create_table.py

from sansa import create_app
from sansa import db

app = create_app()

with app.app_context():
    db.create_all()

run.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
"""
生成依赖文件：
    pipreqs ./

"""
from sansa import create_app

app = create_app()

if __name__ == '__main__':
    app.run()

settings.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-

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://[email protected]:3306/s7day145_2?charset=utf8"
    SQLALCHEMY_POOL_SIZE = 5
    SQLALCHEMY_POOL_TIMEOUT = 30
    SQLALCHEMY_POOL_RECYCLE = -1

    # 追踪对象的修改并且发送信号
    SQLALCHEMY_TRACK_MODIFICATIONS = False


class ProductionConfig(BaseConfig):
    pass


class DevelopmentConfig(BaseConfig):
    pass


class TestingConfig(BaseConfig):
    pass

目录结构

项目根目录下

sansa目录下

views目录下