Flask之flask-session的具体使用

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
• memcached
• filesystem
• mongodb
• sqlalchmey

安装

pip3 install flask-session

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()
>>>

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