批量插入数据、自定义分页器，
批量插入数据、自定义分页器，
目录
- ajax结合sweetalert使用
- bulk_create批量插入数据
- 自定义分页器
ajax结合sweetalert使用
点击下载Bootstrap-sweetalert
一通CV大法：
<!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/js/bootstrap.min.js' %}"></script>
<script src="{% static 'dist/sweetalert.min.js' %}"></script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-8 col-md-offset-2">
<h2 class="text-center">数据展示</h2>
<br>
<table class="table-bordered table table-striped table-hover">
<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 in user_queryset %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ user.username }}</td>
<td>{{ user.age }}</td>
<td>{{ user.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">删除</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>
<script>
$('.cancel').click(function () {
swal({
title: "你确定删除吗?",
text: "如果删了，你就跑路吧！",
type: "warning",
showCancelButton: true,
confirmButtonClass: "btn-danger",
confirmButtonText: "是的，我就要删！",
cancelButtonText: "不删了",
closeOnConfirm: false,
closeOnCancel: false
},
function (isConfirm) {
if (isConfirm) {
swal("准备跑路吧！", "跑不了了。。。", "success");
} else {
swal("取消删除", "数据还在", "error");
}
});
})
</script>
</body>
</html>这里有个问题，发现汉字被挡住了。。。
通过谷歌浏览器的检查，查看html元素修改，加上样式即可：
<style>
div.sweet-alert h2 {
padding: 10px;
}
</style最终的实例：
<!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/js/bootstrap.min.js' %}"></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-8 col-md-offset-2">
<h2 class="text-center">数据展示</h2>
<br>
<table class="table-bordered table table-striped table-hover">
<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 in user_queryset %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ user.username }}</td>
<td>{{ user.age }}</td>
<td>{{ user.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.pk }}>删除</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>
<script>
$('.cancel').click(function () {
var $btn = $(this);
swal({
title: "你确定删除吗?",
text: "如果删了，你就跑路吧！",
type: "warning",
showCancelButton: true,
confirmButtonClass: "btn-danger",
confirmButtonText: "是的，我就要删！",
cancelButtonText: "不删了",
closeOnConfirm: false,
closeOnCancel: false,
showLoaderOnConfirm: true
},
function (isConfirm) {
if (isConfirm) {
// 朝后端发送ajax请求
$.ajax({
url: '',
type: 'post',
data: {'delete_id': $btn.attr('userId')},
success: function (data) {
if(data.code==1000){
swal("准备跑路吧！", data.msg, "success");
// 通过DOM操作直接操作标签
$btn.parent().parent().remove()
}else {
swal("有bug", "发生了未知错误", "warning")
}
}
});
} else {
swal("取消删除", "数据还在", "error");
}
});
})
</script>
</body>
</html>后端views.py
def home(request):
if request.is_ajax():
back_dic = {'code': 1000, 'msg': ''}
delete_id = request.POST.get('delete_id')
time.sleep(3)
models.User.objects.filter(pk=delete_id).delete()
back_dic['msg'] = '数据已经被我删掉了'
return JsonResponse(back_dic)
user_queryset = models.User.objects.all()
return render(request, 'home.html', locals())bulk_create批量插入数据
在django向数据库插入多条数据， 按照原本最笨的方法：
def index(request):
for i in range(1000):
models.Book.objects.create(title=f'第{i}本书')这种插入方式很耗时间，对数据库的压力也很大
使用bulk_create 方法 批量插入数据：
def index(request):
book_list = []
for i in range(10000):
book_list.append(models.Book(title=f'第{i}本书'))
models.Book.objects.bulk_create(book_list)
book_queryset = models.Book.objects.all()
return render(request, 'index.html', locals())自定义分页器
分页器组件
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)使用方法：
在app应用下先建utils文件夹，在utils下先建mypage.py，复制上述的分页器代码
在views.py中：
from app01.utils.mypage import Pagination
def index(request):
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() # 统计数据的总条数
page_obj = Pagination(current_page=current_page, all_count=all_count, per_page_num=10, pager_count=5) # 生成一个分页器对象
page_queryset = book_queryset[page_obj.start:page_obj.end]
return render(request, 'index.html', locals())前端：
{% for book in book_queryset %}
<p>{{ book }}</p>
{% endfor %}
{{ page_obj.page_html|safe }} 相关内容
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