前面我們介紹了cookies，主要應用在用戶登錄上，保存用戶登錄狀態，不過cookies直接放在了瀏覽器上，安全性較低，所以我們便引出了session功能與cookies相同，不同的是它放在了客戶端，相比較cookies來說安全性更高。還有分頁，這是一個比較常用的功能。
一、session
1、基本語法：
1、設置Sessions值 request.session['session_name'] ="admin"2、獲取Sessions值 session_name = request.session["session_name"] session_name = request.session.get("session_name")3、刪除Sessions值 del request.session["session_name"] request.session.flush()4、檢測是否操作session值 if "session_name" is request.session :2、解析圖
3、實例
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>姓名 <input type="text" name="user"></p> <p>密碼 <input type="password" name="pwd"></p> <input type="submit"></form>二、分頁
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): ''' 批量導入數據: Booklist=[] for i in range(100): Booklist.append(Book(title="book"+str(i),price=30+i*i)) Book.objects.bulk_create(Booklist) ''' '''分頁器的使用: book_list=Book.objects.all() paginator = Paginator(book_list, 10) print("count:",paginator.count) #數據總數 print("num_pages",paginator.num_pages) #總頁數 print("page_range",paginator.page_range) #頁碼的列表 page1=paginator.page(1) #第1頁的page對象 for i in page1: #遍歷第1頁的所有數據對象 print(i) print(page1.object_list) #第1頁的所有數據 page2=paginator.page(2) print(page2.has_next()) #是否有下一頁 print(page2.next_page_number()) #下一頁的頁碼 print(page2.has_previous()) #是否有上一頁 print(page2.previous_page_number()) #上一頁的頁碼 # 拋錯 #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) except PageNotAnInteger: book_list = paginator.page(1) except 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><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="external nofollow" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"></head><body><div class="container"> <h4>分頁器</h4> <ul> {% for book in book_list %} <li>{{ book.title }} -----{{ book.price }}</li> {% endfor %} </ul> <ul class="pagination" id="pager"> {% if book_list.has_previous %} <li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}" rel="external nofollow" >上一頁</a></li> {% else %} <li class="previous disabled"><a href="#" rel="external nofollow" rel="external nofollow" >上一頁</a></li> {% endif %} {% for num in paginator.page_range %} {% if num == currentPage %} <li class="item active"><a href="/index/?page={{ num }}" rel="external nofollow" rel="external nofollow" >{{ num }}</a></li> {% else %} <li class="item"><a href="/index/?page={{ num }}" rel="external nofollow" rel="external nofollow" >{{ num }}</a></li> {% endif %} {% endfor %} {% if book_list.has_next %} <li class="next"><a href="/index/?page={{ book_list.next_page_number }}" rel="external nofollow" >下一頁</a></li> {% else %} <li class="next disabled"><a href="#" rel="external nofollow" rel="external nofollow" >下一頁</a></li> {% endif %} </ul></div></body></html>3、擴展
def index(request): book_list=Book.objects.all() paginator = Paginator(book_list, 15) page = request.GET.get('page',1) currentPage=int(page) # 如果頁數十分多時，換另外一種顯示方式 if paginator.num_pages>30: if currentPage-5<1: pageRange=range(1,11) 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) except PageNotAnInteger: book_list = paginator.page(1) except EmptyPage: book_list = paginator.page(paginator.num_pages) return render(request,"index.html",locals())以上這篇django之session與分頁(實例講解)就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持VEVB武林網。
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