django之session与分页(实例讲解)

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 :

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/")

 {% csrf_token %}
 
姓名 
 
密码 
 

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})

 
 
 





 
分页器
 


  {% for book in book_list %}
    
{{ book.title }} -----{{ book.price }}
  {% endfor %}

  


 


     {% if book_list.has_previous %}
     
上一页
     {% else %}
     
上一页
     {% endif %}


     {% for num in paginator.page_range %}

      {% if num == currentPage %}
      
{{ num }}
      {% else %}
      
{{ num }}

      {% endif %}
     {% endfor %}



     {% if book_list.has_next %}
     
下一页
     {% else %}
     
下一页
     {% endif %}

   

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())