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():

Booklist.append(Book(title="book"+str(i),price=+i*i))

Book.objects.bulk_create(Booklist)

'''

'''

分页器的使用:

book_list=Book.objects.all()

paginator = Paginator(book_list, )    # 创建一个分页器对象，按照页显示10条数据对book_list分页

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() #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()

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() # error:EmptyPage

#page=paginator.page("z") # error:PageNotAnInteger

'''

book_list=Book.objects.all()

paginator = Paginator(book_list, )

page = request.GET.get('page',)

currentPage=int(page)

try:

print(page)

book_list = paginator.page(page)

except PageNotAnInteger:

book_list = paginator.page()

except EmptyPage:

book_list = paginator.page(paginator.num_pages)

return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})

<!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"

    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 }}">上一页</a></li>

                 {% else %}

                    <li class="previous disabled"><a href="#">上一页</a></li>

                 {% endif %}

                 {% for num in paginator.page_range %}

                     {% if num == currentPage %}

                       <li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li>

                     {% else %}

                       <li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li>

                     {% endif %}

                 {% endfor %}

                 {% if book_list.has_next %}

                    <li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>

                 {% else %}

                    <li class="next disabled"><a href="#">下一页</a></li>

                 {% endif %}

            </ul>

</div>

</body>

</html>

def index(request):

    book_list=Book.objects.all()

    paginator = Paginator(book_list, )

    page = request.GET.get('page',)

    currentPage=int(page)

    #  如果页数十分多时，换另外一种显示方式

    if paginator.num_pages>:

        if currentPage-<:

            pageRange=range(,)

        elif currentPage+>paginator.num_pages:

            pageRange=range(currentPage-,paginator.num_pages+)

        else:

            pageRange=range(currentPage-,currentPage+)

    else:

        pageRange=paginator.page_range

    try:

        print(page)

        book_list = paginator.page(page)

    except PageNotAnInteger:

        book_list = paginator.page()

    except EmptyPage:

        book_list = paginator.page(paginator.num_pages)

    return render(request,"index.html",locals())