发布于 2018-02-18 23:58:34 | 162 次阅读 | 评论: 0 | 来源: 网友投递
Django Python WEB开发框架
Django是一个开放源代码的Web应用框架,由Python写成。采用了MVC的软件设计模式,即模型M,视图V和控制器C。它最初是被开发来用于管理劳伦斯出版集团旗下的一些以新闻内容为主的网站的,即是CMS(内容管理系统)软件。并于2005年7月在BSD许可证下发布。这套框架是以比利时的吉普赛爵士吉他手Django Reinhardt来命名的。
前面我们介绍了cookies,主要应用在用户登录上,保存用户登录状态,不过cookies直接放在了浏览器上,安全性较低,所以我们便引出了session功能与cookies相同,不同的是它放在了客户端,相比较cookies来说安全性更高。还有分页,这是一个比较常用的功能。
一、session
1、基本语法:
1、设置Sessions值
request.session['session_name'] ="admin"
2、获取Sessions值
session_name = request.session["session_name"]
session_name = request.session.get("session_name")
3、删除Sessions值
del request.session["session_name"]
request.session.flush()
4、检测是否操作session值
if "session_name" is request.session :
2、解析图
3、实例
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>密码 <input type="password" name="pwd"></p>
<input type="submit">
</form>
二、分页
1、view
from django.shortcuts import render,HttpResponse
# Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def index(request):
'''
批量导入数据:
Booklist=[]
for i in range(100):
Booklist.append(Book(title="book"+str(i),price=30+i*i))
Book.objects.bulk_create(Booklist)
'''
'''
分页器的使用:
book_list=Book.objects.all()
paginator = Paginator(book_list, 10)
print("count:",paginator.count) #数据总数
print("num_pages",paginator.num_pages) #总页数
print("page_range",paginator.page_range) #页码的列表
page1=paginator.page(1) #第1页的page对象
for i in page1: #遍历第1页的所有数据对象
print(i)
print(page1.object_list) #第1页的所有数据
page2=paginator.page(2)
print(page2.has_next()) #是否有下一页
print(page2.next_page_number()) #下一页的页码
print(page2.has_previous()) #是否有上一页
print(page2.previous_page_number()) #上一页的页码
# 抛错
#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>分页器</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" >上一页</a></li>
{% else %}
<li class="previous disabled"><a href="#" rel="external nofollow" rel="external nofollow" >上一页</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" >下一页</a></li>
{% else %}
<li class="next disabled"><a href="#" rel="external nofollow" rel="external nofollow" >下一页</a></li>
{% endif %}
</ul>
</div>
</body>
</html>
3、扩展
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 15)
page = request.GET.get('page',1)
currentPage=int(page)
# 如果页数十分多时,换另外一种显示方式
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())
以上这篇django之session与分页(实例讲解)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持PHPERZ。