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
pip install flask-session
存储方式
from flask import Flask,sessionfrom flask_session import RedisSessionInterfaceapp = Flask(__name__)app.secret_key = 'asdf'# 默认# from flask.sessions import SecureCookieSessionInterface# app.session_interface = SecureCookieSessionInterface()# 方式一：redis 保存session# from redis import Redis# app.session_interface = RedisSessionInterface(# redis=Redis(host='127.0.0.1',port=6379),# key_prefix='flaskxxx'# )# 方式二：redis 保存sessionfrom flask_session import Sessionfrom redis import Redisapp.config['SESSION_TYPE'] = 'redis'app.config['SESSION_REDIS'] = Redis(host='192.168.0.94',port='6379')Session(app)@app.route('/login')def login(): session['k1'] = 123 return 'login'@app.route('/xx')def index(): v = session['k1'] print(v) return 'Index'if __name__ == '__main__': app.wsgi_app app.run() 总体步骤分为两步
应用： a. 配置 app.config['SESSION_TYPE'] = 'redis' app.config['SESSION_REDIS'] = Redis(host='192.168.0.94',port='6379') b. 替换 from flask_session import Session Session(app)
注意点：
session中存储的是字典，修改字典内部元素时，会造成数据不更新，解决方法
1- motified = True2- SESSION_REFRESH_EACH_REQUEST = True and session.permanent = True(redis中默认)
示例
from flask import Blueprint,render_template,request,session,redirectfrom uuid import uuid4account = Blueprint('account',__name__)@account.route('/login',methods=['GET',"POST"])def login(): if request.method == 'GET': return render_template('login.html') user = request.form.get('user') pwd = request.form.get('pwd') if user == 'alex' and pwd == '123': uid = str(uuid4()) session.permanent = True session['user_info'] = {'id':uid, 'name':user} return redirect('/index') else: return render_template('login.html',msg='用户名或密码错误') 配置文件中还要设置SESSION_REFRESH_EACH_REQUEST = True
其它类型的存储方式
memcached
#!/usr/bin/env python# -*- coding:utf-8 -import redisfrom flask import Flask, sessionfrom flask_session import Sessionimport memcacheapp = Flask(__name__)app.debug = Trueapp.secret_key = 'xxxx'app.config['SESSION_TYPE'] = 'memcached' # session类型为redisapp.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 redisfrom flask import Flask, sessionfrom flask_session import Sessionapp = Flask(__name__)app.debug = Trueapp.secret_key = 'xxxx'app.config['SESSION_TYPE'] = 'filesystem' # session类型为redisapp.config[ 'SESSION_FILE_DIR'] = '/Users/wupeiqi/PycharmProjects/grocery/96.Flask新课程/组件/2.flask-session' # session类型为redisapp.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 redisfrom flask import Flask, sessionfrom flask_session import Sessionimport pymongoapp = Flask(__name__)app.debug = Trueapp.secret_key = 'xxxx'app.config['SESSION_TYPE'] = 'mongodb' # session类型为redisapp.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 redisfrom flask import Flask, sessionfrom flask_session import Session as FSessionfrom flask_sqlalchemy import SQLAlchemyapp = Flask(__name__)app.debug = Trueapp.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SQLAlchemydb = SQLAlchemy(app)app.config['SESSION_TYPE'] = 'sqlalchemy' # session类型为sqlalchemyapp.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$ python3Python 3.5.1 (v3.5.1:37a07cee5969, Dec 5 2015, 21:12:44)[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwinType "help", "copyright", "credits" or "license" for more information.>>> from app import db>>> db.create_all()>>>