自動序列化

借助serializers幫你自動完成序列化

from app01 import models
from django.core import serializers
def ab_se(request):user_queryset = models.Userinfo.objects.all()#原始方法user_list = []for user_obj in user_queryset:user_list.append({'username':user_obj.username,'password':user_obj.password,'gender':user_obj.get_gender_display(),})res = json.dumps(user_list)#方法****2res = serializers.serialize('json',user_queryset)  # 序列化return HttpResponse(res)

?

批量插入數據

models.Book.objects.bulk_create(book_list)
?

分頁器

#原始分頁 切片
book_queryset=models.Book.objects.all()[0:10]

自定義

補充：

封裝代碼的思路

1.先用最粗糙的代碼實現功能

2.在功能基礎上，再考慮優化

a.先函數

b.在對象

并不一定要面向對象

?

用到非django內置的第三方功能或組件代碼時，

一般創建utils文件夾，一般在project根目錄，在文件夾內對模塊進行功能性劃分

utils可以在每個應用創建，具體看實際情況。

class

class Pagination(object):def __init__(self,current_page,all_count,per_page_num=2,pager_count=11):"""封裝分頁相關數據:param current_page: 當前頁:param all_count:    數據庫中的數據總條數:param per_page_num: 每頁顯示的數據條數:param pager_count:  最多顯示的頁碼個數用法:queryset = model.objects.all()page_obj = Pagination(current_page,all_count)page_data = queryset[page_obj.start:page_obj.end]獲取數據用page_data而不再使用原始的queryset獲取前端分頁樣式用page_obj.page_html"""try:current_page = int(current_page)except Exception as e:current_page = 1if current_page <1:current_page = 1self.current_page = current_pageself.all_count = all_countself.per_page_num = per_page_num# 總頁碼all_pager, tmp = divmod(all_count, per_page_num)if tmp:all_pager += 1self.all_pager = all_pagerself.pager_count = pager_countself.pager_count_half = int((pager_count - 1) / 2)@propertydef start(self):return (self.current_page - 1) * self.per_page_num@propertydef end(self):return self.current_page * self.per_page_numdef page_html(self):# 如果總頁碼 < 11個：if self.all_pager <= self.pager_count:pager_start = 1pager_end = self.all_pager + 1# 總頁碼  > 11else:# 當前頁如果<=頁面上最多顯示11/2個頁碼if self.current_page <= self.pager_count_half:pager_start = 1pager_end = self.pager_count + 1# 當前頁大于5else:# 頁碼翻到最后if (self.current_page + self.pager_count_half) > self.all_pager:pager_end = self.all_pager + 1pager_start = self.all_pager - self.pager_count + 1else:pager_start = self.current_page - self.pager_count_halfpager_end = self.current_page + self.pager_count_half + 1page_html_list = []# 添加前面的nav和ul標簽page_html_list.append('''<nav aria-label='Page navigation>'<ul class='pagination'>''')first_page = '<li><a href="?page=%s">首頁</a></li>' % (1)page_html_list.append(first_page)if self.current_page <= 1:prev_page = '<li class="disabled"><a href="#">上一頁</a></li>'else:prev_page = '<li><a href="?page=%s">上一頁</a></li>' % (self.current_page - 1,)page_html_list.append(prev_page)for i in range(pager_start, pager_end):if i == self.current_page:temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,)else:temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,)page_html_list.append(temp)if self.current_page >= self.all_pager:next_page = '<li class="disabled"><a href="#">下一頁</a></li>'else:next_page = '<li><a href="?page=%s">下一頁</a></li>' % (self.current_page + 1,)page_html_list.append(next_page)last_page = '<li><a href="?page=%s">尾頁</a></li>' % (self.all_pager,)page_html_list.append(last_page)# 尾部添加標簽page_html_list.append('''</nav></ul>''')return ''.join(page_html_list)

后端

def get_book(request):book_list = models.Book.objects.all()current_page = request.GET.get("page",1)all_count = book_list.count()page_obj = Pagination(current_page=current_page,all_count=all_count,per_page_num=10)page_queryset = book_list[page_obj.start:page_obj.end]return render(request,'booklist.html',locals())

前端

<div class="container"><div class="row"><div class="col-md-8 col-md-offset-2">{% for book in page_queryset %}<p>{{ book.title }}</p>{% endfor %}{{ page_obj.page_html|safe }}</div></div>
</div>

?

?

參考：

https://www.cnblogs.com/guyouyin123/p/12173020.html