python的web框架webpy【session & cookie】五

webpty中使用session非常简单

import web
web.config.debug = False
urls = (
    "/count", "count",
    "/reset", "reset"
)
app = web.application(urls, locals())
session = web.session.Session(app, web.session.DiskStore('sessions'), initializer={'count': 0})

class count:
    def GET(self):
        session.count += 1
        return str(session.count)

class reset:
    def GET(self):
        session.kill()
        return ""

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

initializer 指定session的初始化值

web.session.DiskStore('sessions') #设置session的存储方式为磁盘

我们也可以指定session存储在数据库中

db = web.database(dbn='postgres', db='mydatabase', user='myname', pw='')
store = web.session.DBStore(db, 'sessions')
session = web.session.Session(app, store, initializer={'count': 0})

表结构

 create table sessions (
    session_id char(128) UNIQUE NOT NULL,
    atime timestamp NOT NULL default current_timestamp,
    data text
);

我们可以通过web.config对session进行一些可选设置

web.config.session_parameters['cookie_name'] = 'webpy_session_id'
web.config.session_parameters['cookie_domain'] = None
web.config.session_parameters['timeout'] = 86400, #24 * 60 * 60, # 24 hours   in seconds
web.config.session_parameters['ignore_expiry'] = True
web.config.session_parameters['ignore_change_ip'] = True
web.config.session_parameters['secret_key'] = 'fLjUfxqXtfNoIldA0A0J'
web.config.session_parameters['expired_message'] = 'Session expired'

webpy中使用cookie

setcookie(name, value, expires="", domain=None, secure=False): 

cookie_name - session id 存储在cookie中的名称
cookie_domain - cookie的domain
timeout - session 过期时间，单位为秒
ignore_expiry -如果设置为True则忽略过期时间
ignore_change_ip - 如果为False则来自同一ip则session才有效
secret_key - session id的hash值
expired_message - session 失效后显示的信息

设置cookie