Django Basics (ii)

1. Saving between many-to-many tables

Way One:

    U2 = User.objects.get (id=2)    g2 = Group.objects.get (id=2)    U2.group_relation.add (G2)    #在关系表中存入关联数据

Way two:

name = Request. Post.get (' name ', None) Username = Request. Post.get (' username ', None) password = Request. Post.get (' password ', None) gplist = Request. Post.getlist (' groupId ') user = Users.objects.create (name=name,username=username,password=password) User.save () Glist = UserGroup.objects.filter (id__in=gplist) User.groupId.add (*glist) # or #for Gord in gplist:#    group = UserGroup.objects.get (Id=gord) #    User.groupId.add (group)

Way three:

    U2 = User.objects.get (id=2)    g2 = Group.objects.get (id=2)    G2.user_set.add (U2)    #无多对多字段方添加关联, _set is a fixed collocation, It is preceded by the lowercase of the class name of the class that contains many-to-many fields

2. Data acquisition between many-to-many tables

    U2 = User.objects.get (id=2)    g2 = Group.objects.get (id=2)    print (U2.group_relation.all ())    print (U2.group _relation.all ()). Filter (id=1)    print (U2.group_relation.all ()). Filter (caption= ' CEO ')

3. Session

A) request.session[' is_login '] = True  with session value b) Is_login = Request.session.get (' Is_login ', None)  Get session value C) Del request.session[' Is_login '] destroy Sessiond) settings.py set session_cooke_age=10 settings session10 seconds expire auto destroy I. Session_expire_at_browser_close set whether session is destroyed as the browser shuts down

4. Cooke

Response = Render_to_response (' index.html ', ret) Response.set_cookie (' key ', ' value ')   #设置cookeprint request. COOKIES   #获取cookierequest. Cookies.get (' Page_num ', 10)

Django Basics (ii)