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  • Flask之flask-session

    简介

    flask-session是flask框架的session组件,由于原来flask内置session使用签名cookie保存,该组件则将支持session保存到多个地方,如:

    • redis:保存数据的一种工具,五大类型。非关系型数据库
    • memcached
    • filesystem
    • mongodb
    • sqlalchmey:那数据存到数据库表里面

    安装

    pip3 install flask-session
    

    配置存储方式

    redis

    #!/usr/bin/env python
    # -*- coding:utf-8 -
    import redis
    from flask import Flask, session
    from flask_session import Session
    
    app = Flask(__name__)
    app.debug = True
    app.secret_key = 'xxxx'
    
    app.config['SESSION_TYPE'] = 'redis'  # session类型为redis
    app.config['SESSION_PERMANENT'] = False  # 如果设置为True,则关闭浏览器session就失效。
    app.config['SESSION_USE_SIGNER'] = False  # 是否对发送到浏览器上session的cookie值进行加密
    app.config['SESSION_KEY_PREFIX'] = 'session:'  # 保存到session中的值的前缀
    app.config['SESSION_REDIS'] = redis.Redis(host='127.0.0.1', port='6379', password='123123')  # 用于连接redis的配置
    
    Session(app)
    
    
    @app.route('/index')
    def index():
        session['k1'] = 'v1'
        return 'xx'
    
    
    if __name__ == '__main__':
        app.run()
    

      

    memcached

    #!/usr/bin/env python
    # -*- coding:utf-8 -
    import redis
    from flask import Flask, session
    from flask_session import Session
    import memcache
    
    app = Flask(__name__)
    app.debug = True
    app.secret_key = 'xxxx'
    
    
    app.config['SESSION_TYPE'] = 'memcached' # session类型为redis
    app.config['SESSION_PERMANENT'] = True # 如果设置为True,则关闭浏览器session就失效。
    app.config['SESSION_USE_SIGNER'] = False # 是否对发送到浏览器上session的cookie值进行加密
    app.config['SESSION_KEY_PREFIX'] = 'session:' # 保存到session中的值的前缀
    app.config['SESSION_MEMCACHED'] = memcache.Client(['10.211.55.4:12000'])
    
    
    Session(app)
    
    
    @app.route('/index')
    def index():
        session['k1'] = 'v1'
        return 'xx'
    
    
    if __name__ == '__main__':
        app.run()

    filesystem

    #!/usr/bin/env python
    # -*- coding:utf-8 -
    import redis
    from flask import Flask, session
    from flask_session import Session
    
    app = Flask(__name__)
    app.debug = True
    app.secret_key = 'xxxx'
    
    app.config['SESSION_TYPE'] = 'filesystem'  # session类型为redis
    app.config[
        'SESSION_FILE_DIR'] = '/Users/wupeiqi/PycharmProjects/grocery/96.Flask新课程/组件/2.flask-session'  # session类型为redis
    app.config['SESSION_FILE_THRESHOLD'] = 500  # 存储session的个数如果大于这个值时,就要开始进行删除了
    app.config['SESSION_FILE_MODE'] = 384  # 文件权限类型
    
    app.config['SESSION_PERMANENT'] = True  # 如果设置为True,则关闭浏览器session就失效。
    app.config['SESSION_USE_SIGNER'] = False  # 是否对发送到浏览器上session的cookie值进行加密
    app.config['SESSION_KEY_PREFIX'] = 'session:'  # 保存到session中的值的前缀
    
    Session(app)
    
    
    @app.route('/index')
    def index():
        session['k1'] = 'v1'
        session['k2'] = 'v1'
        return 'xx'
    
    
    if __name__ == '__main__':
        app.run()

    mongodb

    #!/usr/bin/env python
    # -*- coding:utf-8 -
    import redis
    from flask import Flask, session
    from flask_session import Session
    import pymongo
    
    app = Flask(__name__)
    app.debug = True
    app.secret_key = 'xxxx'
    
    app.config['SESSION_TYPE'] = 'mongodb'  # session类型为redis
    
    app.config['SESSION_MONGODB'] = pymongo.MongoClient()
    app.config['SESSION_MONGODB_DB'] = 'mongo的db名称(数据库名称)'
    app.config['SESSION_MONGODB_COLLECT'] = 'mongo的collect名称(表名称)'
    
    app.config['SESSION_PERMANENT'] = True  # 如果设置为True,则关闭浏览器session就失效。
    app.config['SESSION_USE_SIGNER'] = False  # 是否对发送到浏览器上session的cookie值进行加密
    app.config['SESSION_KEY_PREFIX'] = 'session:'  # 保存到session中的值的前缀
    
    Session(app)
    
    
    @app.route('/index')
    def index():
        session['k1'] = 'v1'
        session['k2'] = 'v1'
        return 'xx'
    
    
    if __name__ == '__main__':
        app.run()

    mongodb操作简单示例:

    #!/usr/bin/env python
    # -*- coding:utf-8 -*-
    from pymongo import MongoClient
    
    # 创建链接
    conn = MongoClient('47.93.4.198', 27017)
    
    # 选择数据库
    db = conn['db1']
    
    # 选择表
    posts = db['posts']
    
    post_data = {
        'name': 'alex',
        'age': 18
    }
    
    # 表中插入数据
    # result = posts.insert_one(post_data)
    
    # 获取一条数据
    # row = posts.find_one()
    # print(row)
    
    # # 获取多条数据
    # rows = posts.find()
    # for row in rows:
    #     print(row)
    
    # 删除多条数据
    # rows = posts.delete_many(filter={})
    # print(rows)
    
    # 更新多条数据
    # posts.update({}, {'name': 'wupeiqi'})

    sqlalchemy

    #!/usr/bin/env python
    # -*- coding:utf-8 -
    import redis
    from flask import Flask, session
    from flask_session import Session as FSession
    from flask_sqlalchemy import SQLAlchemy
    
    app = Flask(__name__)
    app.debug = True
    app.secret_key = 'xxxx'
    
    # 设置数据库链接
    app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:123@127.0.0.1:3306/fssa?charset=utf8'
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
    
    # 实例化SQLAlchemy
    db = SQLAlchemy(app)
    
    
    
    app.config['SESSION_TYPE'] = 'sqlalchemy'  # session类型为sqlalchemy
    app.config['SESSION_SQLALCHEMY'] = db # SQLAlchemy对象
    app.config['SESSION_SQLALCHEMY_TABLE'] = 'session' # session要保存的表名称
    app.config['SESSION_PERMANENT'] = True  # 如果设置为True,则关闭浏览器session就失效。
    app.config['SESSION_USE_SIGNER'] = False  # 是否对发送到浏览器上session的cookie值进行加密
    app.config['SESSION_KEY_PREFIX'] = 'session:'  # 保存到session中的值的前缀
    FSession(app)
    
    
    @app.route('/index')
    def index():
    
        session['k1'] = 'v1'
        session['k2'] = 'v1'
    
        return 'xx'
    
    
    if __name__ == '__main__':
        app.run()

    PS: 在写好代码后,不要着急运行,需要先执行进入终端执行一条创建数据库表的命令:

    bogon:pro-flask wupeiqi$ python3
    Python 3.5.1 (v3.5.1:37a07cee5969, Dec  5 2015, 21:12:44)
    [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from app import db
    >>> db.create_all()
    >>>

     应用场景

    如果应用程序比较小,就用原生的加密ccokie 保存session(内置)

    如果应用程序比较大,就用redis(flask-session)


     
     
     
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  • 原文地址:https://www.cnblogs.com/jiangchunsheng/p/9218346.html
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