批量插入与分页器
ajax与sweetalret的使用
前端：
<!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> {% load static %} <link rel="stylesheet" href="{% static 'bootstrap-3.3.7-dist/css/bootstrap.min.css' %}"> <link rel="stylesheet" href="{% static 'dist/sweetalert.css' %}"> <script src="{% static 'bootstrap-3.3.7-dist/css/bootstrap.min.css' %}"></script> <script src="{% static 'dist/sweetalert.min.js' %}"></script> <style> div.sweet-alert h2 { padding: 10px } </style> </head> <body> <div class="container-fluid"> <div class="row"> <div class="col-md-6 col-md-offset-2"> <h2 class="text-center">数据展示</h2> <br> <table class="table table-hover table-bordered table-striped"> <thead> <tr> <th>序号</th> <th>用户名</th> <th>年龄</th> <th>性别</th> <th class="text-center">操作</th> </tr> </thead> <tbody> {% for user_obj in user_queryset %} <tr> <td>{{ forloop.counter }}</td> <td>{{ user_obj.username }}</td> <td>{{ user_obj.age }}</td> <td>{{ user_obj.get_gender_display }}</td> <td class="text-center"> <a href="#" class="btn btn-primary btn-sm">编辑</a> <a href="#" class="btn btn-danger btn-sm cancel" userId={{ user_obj.pk }}>删除</a> </td> </tr> {% endfor %} </tbody> </table> </div> </div> </div> <script> $('.cancel').click(function () { var $btn = $(this); swal({ title: "Are you sure?", text: "You will not be able to recover this imaginary file!", type: "warning", showCancelButton: true, confirmButtonClass: "btn-danger", confirmButtonText: "Yes, delete it!", cancelButtonText: "No, cancel plx!", closeOnConfirm: false, closeOnCancel: false, showLoaderOnConfirm: true }, function (isConfirm) { if (isConfirm) { $.ajax({ url: '', type: 'post', data: {'delete_id': $btn.attr('userId')}, success: function (data) { if (data.code == 1000) { swal("删除成功", data.msg, "success"); $btn.parent().parent().remove() } else { swal("有Bug", "发生了未知的错误", "warning"); } } }); } else { swal("Cancelled", "Your imaginary file is safe :)", "error"); } }); }) </script> </body> </html>
后端：
from django.shortcuts import render from app01 import models from django.http import JsonResponse import time # Create your views here. def home(request): if request.is_ajax(): back_dic = {'code': 1000, 'msg': ''} delete_id = request.POST.get('delete_id') time.sleep(2) models.User.objects.filter(pk=delete_id).delete() back_dic['msg'] = '数据删除成功' return JsonResponse(back_dic) user_queryset = models.User.objects.all() return render(request, 'home.html', locals())
模型层：
from django.db import models # Create your models here. class User(models.Model): username = models.CharField(max_length=32) age = models.IntegerField() gender_choice = ( (1, 'male'), (2, 'female'), (3, 'other'), ) gender = models.IntegerField(choices=gender_choice)
bulk_create批量插入数据
for i in range (1000):
models.Book.objects.create(title='第%本书'%i)
(这条指令运行很慢,花了六百多毫秒)
book_list=[ ]
for i in rage(10000):
book_list.append(models.Book(title='第%本书'%i))
批量插入数据 建议使用bulk_create方法
models.Book.objects.bulk_create(book_list)
"""两者差距很大"""
分页器
后端
自定义分页器的使用
book_queryset=models.book.objects.all()#你想要分页展示的数据
current_page=request.GET.get('page',1)#获取当前页
all_count=book_queryset.count()#看一共有多少条数据
page_queryset=book_queryset[page_obj.start:page_obj.end]
return render (request.'index.html',locals())
前端
{% for book in page_queryset %} 将页面上原本的queryset全部换成切片之后的queryset即可
<p>{{book}}</p>
{% endfor %}
{{page_obj.page_html|safe}}告诉这是安全的可以读取
分页器：
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 用法: queryset = model.objects.all() page_obj = Pagination(current_page,all_count) page_data = queryset[page_obj.start:page_obj.end] 获取数据用page_data而不再使用原始的queryset 获取前端分页样式用page_obj.page_html """ 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)
