分页的实现与使用
class Pagination(object):
"""
自定义分页
"""
def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11):
try:
current_page = int(current_page)
except Exception as e:
current_page = 1
if current_page <=0:
current_page = 1
self.current_page = current_page
# 数据总条数
self.total_count = total_count # 每页显示10条数据
self.per_page_count = per_page_count # 页面上应该显示的最大页码
max_page_num, div = divmod(total_count, per_page_count)
if div:
max_page_num += 1
self.max_page_num = max_page_num # 页面上默认显示11个页码（当前页在中间）
self.max_pager_count = max_pager_count
self.half_max_pager_count = int((max_pager_count - 1) / 2) # URL前缀
self.base_url = base_url # request.GET
import copy
params = copy.deepcopy(params)
params._mutable = True
# 包含当前列表页面所有的搜索条件
# {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
# self.params[page] = 8
# self.params.urlencode()
# source=2&status=2&gender=2&consultant=1&page=8
# href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8"
# href="%s?%s" %(self.base_url,self.params.urlencode())
self.params = params @property
def start(self):
return (self.current_page - 1) * self.per_page_count @property
def end(self):
return self.current_page * self.per_page_count def page_html(self):
# 如果总页数 <= 11
if self.max_page_num <= self.max_pager_count:
pager_start = 1
pager_end = self.max_page_num
# 如果总页数 > 11
else:
# 如果当前页 <= 5
if self.current_page <= self.half_max_pager_count:
pager_start = 1
pager_end = self.max_pager_count
else:
# 当前页 + 5 > 总页码
if (self.current_page + self.half_max_pager_count) > self.max_page_num:
pager_end = self.max_page_num
pager_start = self.max_page_num - self.max_pager_count + 1 #倒这数11个
else:
pager_start = self.current_page - self.half_max_pager_count
pager_end = self.current_page + self.half_max_pager_count page_html_list = []
# {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
# 首页
self.params['page'] = 1
first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url,self.params.urlencode(),)
page_html_list.append(first_page)
# 上一页
self.params["page"] = self.current_page - 1
if self.params["page"] < 1:
pervious_page = '<li class="disabled"><a href="%s?%s" aria-label="Previous">上一页</span></a></li>' % (
self.base_url, self.params.urlencode())
else:
pervious_page = '<li><a href = "%s?%s" aria-label = "Previous" >上一页</span></a></li>' % (
self.base_url, self.params.urlencode())
page_html_list.append(pervious_page)
# 中间页码
for i in range(pager_start, pager_end + 1):
self.params['page'] = i
if i == self.current_page:
temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,)
else:
temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,)
page_html_list.append(temp) # 下一页
self.params["page"] = self.current_page + 1
if self.params["page"] > self.max_page_num:
self.params["page"] = self.current_page
next_page = '<li class="disabled"><a href = "%s?%s" aria-label = "Next">下一页</span></a></li >' % (
self.base_url, self.params.urlencode())
else:
next_page = '<li><a href = "%s?%s" aria-label = "Next">下一页</span></a></li>' % (
self.base_url, self.params.urlencode())
page_html_list.append(next_page) # 尾页
self.params['page'] = self.max_page_num
last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),)
page_html_list.append(last_page) return ''.join(page_html_list)
二、使用
"""
自定义分页组件的使用方法：
pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET)
host_list = HOST_LIST[pager_obj.start:pager_obj.end]
html = pager_obj.page_html()
return render(request,'hosts.html',{'host_list':host_list,"page_html":html})
"""
三、批量插入数据
#批量创建数据
# booklist = []
# for i in range(100):
# booklist.append(models.Book(name="book" + str(i), price=20 + i * i))
#
# models.Book.objects.bulk_create(booklist)