批量插入数据
项目需求:浏览器中访问django后端某一条url(如:127.0.0.1:8080/index/),实时朝数据库中生成一千条数据并将生成的数据查询出来,并展示到前端页面
urls.py
from django.conf.urls import url
from app01 import views
urlpatterns = [
url(r'^get_book/',views.get_book)
]
models.py
from django.db import models
class Book(models.Model):
title = models.CharField(max_length=64)
views.py
from django.shortcuts import render, HttpResponse, redirect
from app01 import models
def get_book(request):
# for循环插入1000条数据
for i in range(1000):
models.Book.objects.create(name='第%s本书'%i)
# 将插入的数据再查询出来
book_queryset = models.Book.objcets.all()
return render(request,'get_book.html',locals()) # 将查询出来的数据传递给html页面
template/get_book.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>
{% 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">
<div class="row">
<div class="col-md-8 col-md-offset-2">
{% for book in book_queryset %}
<p>{{ book.title }}</p>
{% endfor %}
</div>
</div>
</div>
</body>
</html>
上述代码书写完毕后启动django后端,浏览器访问,会发现浏览器会有一个明显的卡顿等待时间,这不是你的浏览器有问题也不是网速有问题,而是后端再不停的操作数据库,耗时较长,大概需要等待一段时间之后才能正常看到刚刚插入的1000条数据,很明显这样操作数据库的效率太低,那有没有一种方式是专门用来批量操作数据库的呢?答案是肯定的!