1、批量插入数据
views.py
def booklist(request): # 批量插入10000条数据，且速度很快 list = [] for i in range(10000): list.append(models.Book(name='第%s本书' %i)) # 插数据 models.Book.objects.bulk_create(list) # 查询所有的书籍，展示到前端 # book_list = models.Book.objects.all()
urls.py
from django.conf.urls import url from django.contrib import admin from app01 import views urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^index/', views.index), url(r'^booklist/', views.booklist), ]
booklist.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script> {# <link rel="stylesheet" href="/static/bootstrap-3.3.7/css/bootstrap.min.css">#} {# <script src="/static/bootstrap-3.3.7/js/bootstrap.min.js"></script>#} <link href="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <div class="row"> <div class="col-md-8 col-md-offset-2"> <table class="table table-hover table-bordered table-striped"> <thead> <tr> <th>id</th> <th>name</th> </tr> </thead> <tbody> {% for book in book_list %} <tr> <td>{{ book.pk }}</td> <td>{{ book.name }}</td> </tr> {% endfor %} </tbody> </table> </div> </div> </div> </body> </html>
2、分页器
自己写太麻烦，已经有封装好的分页器，代码如下：
可以在app中新建一个utils目录，在utils中把以下代码写入一个py文件中；
class Pagination(object): def __init__(self, current_page, all_count, per_page_num=2, pager_count=11): """ 封装分页相关数据 :param current_page: 当前页 :param all_count: 数据库中的数据总条数 :param per_page_num: 每页显示的数据条数 :param pager_count: 最多显示的页码个数 """ try: current_page = int(current_page) except Exception as e: current_page = 1 if current_page < 1: current_page = 1 self.current_page = current_page self.all_count = all_count self.per_page_num = per_page_num # 总页码 all_pager, tmp = divmod(all_count, per_page_num) if tmp: all_pager += 1 self.all_pager = all_pager self.pager_count = pager_count self.pager_count_half = int((pager_count - 1) / 2) @property def start(self): return (self.current_page - 1) * self.per_page_num @property def end(self): return self.current_page * self.per_page_num def page_html(self): # 如果总页码 < 11个： if self.all_pager <= self.pager_count: pager_start = 1 pager_end = self.all_pager + 1 # 总页码 > 11 else: # 当前页如果<=页面上最多显示11/2个页码 if self.current_page <= self.pager_count_half: pager_start = 1 pager_end = self.pager_count + 1 # 当前页大于5 else: # 页码翻到最后 if (self.current_page + self.pager_count_half) > self.all_pager: pager_end = self.all_pager + 1 pager_start = self.all_pager - self.pager_count + 1 else: pager_start = self.current_page - self.pager_count_half pager_end = self.current_page + self.pager_count_half + 1 page_html_list = [] # 添加前面的nav和ul标签 page_html_list.append(''' <nav aria-label='Page navigation>' <ul class='pagination'> ''') first_page = '<li><a href="?page=%s">首页</a></li>' % (1) page_html_list.append(first_page) if self.current_page <= 1: prev_page = '<li class="disabled"><a href="#">上一页</a></li>' else: prev_page = '<li><a href="?page=%s">上一页</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="#">下一页</a></li>' else: next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,) page_html_list.append(next_page) last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,) page_html_list.append(last_page) # 尾部添加标签 page_html_list.append(''' </nav> </ul> ''') return ''.join(page_html_list)
后端调用：
views.py
from app01.utils import my_page def booklist(request): book_list = models.Book.objects.all() # 当前页，默认是第一页 current_page = request.GET.get("page", 1) # all_count:数据的总条数 all_count = book_list.count() page_obj = my_page.Pagination(current_page=current_page, all_count=all_count, per_page_num=10) # page_obj.start代表起始位置；page_obj.end代表终止位置 page_queryset = book_list[page_obj.start:page_obj.end] return render(request, 'booklist.html', locals())
前端调用：
booklist.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script> <link href="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <div class="row"> <div class="col-md-8 col-md-offset-2"> <table class="table table-hover table-bordered table-striped"> <thead> <tr> <th>id</th> <th>name</th> </tr> </thead> <tbody> {% for book in page_queryset %} <tr> <td>{{ book.pk }}</td> <td>{{ book.name }}</td> </tr> {% endfor %} </tbody> </table> {{ page_obj.page_html|safe }} </div> </div> </div> </body> </html>
效果如下：
知识点：
<li><a href="?page=1">1</a></li> # 只写?page=1会自动补全当前路径 比如，完整路径是：http://127.0.0.1:8000/booklist/?page=1 它就会自动补全前面的http://127.0.0.1:8000/booklist/