手撸分页器

批量插入数据

在撸分页器之前,先往数据库中插入大量的数据做备用

list = []
for i in range(100000):
    list.append(models.Book(title = '第%s本书'%i))
models.Book.objects.bulk_create(book_list) # 批量插入数据

手撸分页器

def index(request):
     # 1.获取用户想要访问的页码数
    current_page = request.GET.get('page',1)  # 如果没有page参数 默认就展示第一页
    # 转成整型
    current_page = int(current_page)
    # 2.每页展示10条数据
    per_page_num = 10
    # 3.定义起始位置和终止位置
    start_page = (current_page - 1) * per_page_num
    end_page = current_page * per_page_num
    # 4.统计数据的总条数
    book_queryset = models.Book.objects.all()
    all_count = book_queryset.count()
     # 5.求数据到底需要多少页才能展示完
    page_num, more = divmod(all_count,per_page_num)  # divmod(100,10)
    if more:
    	page_num += 1
    # page_num就觉得了 需要多少个页码
    page_html = ''
    xxx = current_page  # xxx就是用户点击的数字
    if current_page < 6:
    	current_page = 6
    for i in range(current_page-5,current_page+6):
    	if xxx == i:
            page_html += '<li class="active"><a href="?page=%s">%s</a></li>'%(i,i)
        else:
            page_html += '<li><a href="?page=%s">%s</a></li>' % (i, i)
    book_queryset = book_queryset[start_page:end_page]
    return render(request,'index.html',locals())