Django session and paging (instance description), django instance description

Django session and paging (instance description), django instance description

We have introduced cookies, which are mainly used for user logon and saving the user logon status. However, cookies are directly stored in the browser, which is less secure. Therefore, session functions are the same as cookies, the difference is that it is placed on the client, which is more secure than cookies. There is also paging, which is a common function.

I. session

1. Basic Syntax:

1. Set the Sessions value request. session ['session _ name'] = "admin" 2. Obtain the Sessions value session_name = request. session ["session_name"] session_name = request. session. get ("session_name") 3. Delete the Sessions value del request. session ["session_name"] request. session. flush () 4. Check whether to operate the session value if "session_name" is request. session:

2. parsing Diagram

3. Instance

1) views

def login(requset): if requset.method=="POST":  username=requset.POST.get("user")  password=requset.POST.get("pwd")  ret=models.UserInfo.objects.filter(username=username,password=password)  if ret:   requset.session["IS_LOGON"]=True   requset.session["USER"]=username   return redirect("/home/")  else:   return redirect("/login/") return render(requset,"login.html")def home(request): ret=request.session.get("IS_LOGON",None) if ret :  username=request.session.get("USER")  return render(request, "home.html",locals()) else:  return redirect("/login/")

2) template

<Form action = "/login/" method = "post" >{% csrf_token %} <p> name <input type = "text" name = "user"> </p> <p> password <input type = "password" name = "pwd"> </p> <input type = "submit"> </form>

Ii. Paging

1. view

From django. shortcuts import render, HttpResponse # Create your views here. from app01.models import * from django. core. paginator import Paginator, EmptyPage, PageNotAnIntegerdef index (request): ''' batch import data: Booklist = [] for I in range (100): Booklist. append (Book (title = "book" + str (I), price = 30 + I * I) Book. objects. use of the bulk_create (Booklist) ''''' page sharer: book_list = Book. objects. all () paginator = Paginator (book_list, 10) print ("count:", paginator. count) # print ("num_pages", paginator. num_pages) # print ("page_range", paginator. page_range) # page number list page1 = paginator. page (1) # page Object on page 1st for I in page1: # print (I) print (page1.object _ list) # page2 = paginator. page (2) print (page2.has _ next () # whether the next page has print (page2.next _ page_number () # print (page2.has _ previous ()) # Whether the previous page has print (page2.previous _ page_number () # The previous page number # throwing an error # page = paginator. page (12) # error: EmptyPage # page = paginator. page ("z") # error: PageNotAnInteger ''' book_list = Book. objects. all () paginator = Paginator (book_list, 10) page = request. GET. get ('page', 1) currentPage = int (page) try: print (page) book_list = paginator. page (page) Comment t PageNotAnInteger: book_list = paginator. page (1) Partition t EmptyPage: book_list = paginator. page (paginator. num_pages) return render (request, "index.html", {"book_list": book_list, "paginator": paginator, "currentPage": currentPage })

2. templates

<! DOCTYPE html> 
3. Expansion
Def index (request): book_list = Book. objects. all () paginator = Paginator (book_list, 15) page = request. GET. get ('page', 1) currentPage = int (page) # if there are too many pages, use another display method if paginator. num_pages> 30: if currentPage-5 <1: pageRange = range () elif currentPage + 5> paginator. num_pages: pageRange = range (currentPage-5, paginator. num_pages + 1) else: pageRange = range (currentPage-5, currentPage + 5) else: pageRange = paginator. page_range try: print (page) book_list = paginator. page (page) Comment t PageNotAnInteger: book_list = paginator. page (1) Partition t EmptyPage: book_list = paginator. page (paginator. num_pages) return render (request, "index.html", locals ())
The above django session and page (instance description) are all the content shared by Alibaba Cloud xiaobian. I hope you can give us a reference and support the house of friends.