Life cycle of 1.diango requests
Url-> Routing System--view function (get template + data) rendered--string returned to user
2. Routing system
/index/---> Functions or Classes. As_view ()
/detail/(\d+)---Parameters of the > function or the parameters of the class
/detail/(? p<nid>\d+)---The parameters of the > function or the parameters of the class----specify parameters
/detail/----> include ("App01.urls") route distribution.
3. View functions
FBV: Functions
def index (Request,*args,**kwargs)
..
CBV: Class
Class Home (view. View)
def get (Self,request,*args,**kwargs)
...
To get the data requested by the user:
Request. Post.get () (POST request)
Request. Get.get () (GET request)
Request. Files.get () (for transferring files)
... getlist ()
Request.path_info ()
File Object = Request. Files.get ()
File object. Name
File object. Size
The file object. Chunks ()
To return data to the user:
Render (request, mainly the path to the local HTML template file [if there is a rendering, the returned data is given back. ])
Redirect (request, mostly return URL)
HttpResponse (String)
4. Template language
: Render (request, mainly the path to the local HTML template file [if there is a rendering, the returned data is given back.) ])
<body>
{%for I in k2%}
{{i}}
{% ENFOR%}
{%for i in k2.keys%}
{{i}}
{% ENFOR%}
{%for i in k2.values%}
{{i}}
{% ENFOR%}
{%for k,v in k2.items%}
{{k}}-{{v}}
{% ENFOR%}
</body>
4.ORM
A. Creating Classes and fields
Class User (models. Model):
id = models. Intergerfiled ()
Name = models. CHARFIENLD (max_length =) #字符长度
Python manage.py makemigrations
Python manage.py Migrate
#settings. PY Registration App
B. Operation
Increase
Models. User.objects.create (name = "xxxx", age = ' xxxx ')
DIC = {' name ': ' xxx ', ' age ': ' 19 '}
Models. User.objecs.create (**dic)
obj = models. User (name = "xxxx", age = ' xxxx ')
Obj.save ()
By deleting
Models. User.objecs.filter (XXX). Delete ()
Change
Models. User.objecs.filter (Id__gt =1). Update (name = ' jxhs ') #把数据库中id大于1的中id大于1的 change the name value to JXHS
DIC = {' name ': ' xxx ', ' age ': ' 19 '}
Models. User.objecs.filter (id__gt = 1). Update (**dic) #用字典格式上传
Check
Models. User.objecs.filter (id = 1) #等于
Models. User.objecs.filter (id_gt = 1) #大于
Models. User.objecs.filter (id_lt = 1) #小于
Models. User.objecs.filter (Id_gte = 1) #大于等于
Models. User.objecs.filter (Id_lte = 1) #等于小于
Federated queries
Models. User.objecs.filter (id = 1, name = ' root ')
DIC = {' name ': ' xxx ', ' age ': ' 19 '}
Models. User.objecs.filter (**dic)
A fuzzy query for a federated query of a dictionary
DIC = {' name ': ' xxxx ' age_gt: ' + '} #名字为xxxx and older than 19
Models. User.objecs.filter (**dic)
Some review of Django (mainly operations on the database)
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