python django 增删改查操作数据库Mysql_Python

下面介绍一下django 增删改查操作：

1、view.py

									# -*- coding: utf-8 -*-

									from __future__ import unicode_literals

									from django.http import HttpResponse

									from polls.models import Test

									from django.shortcuts import render

									# Create your views here.

									# 解决乱码

									import sys

									reload(sys)

									sys.setdefaultencoding('utf-8')

									# 数据库操作

									def testdb(request):

									  test1 = Test(name='温鸿雨2')

									  test1.save()

									  return HttpResponse("<p>数据添加成功！</p>")

									# 查询数据库

									def selectDB(request):

									  # 通过objects这个模型管理器的all()获得所有数据行，相当于SQL中的SELECT * FROM

									  list = Test.objects.all()

									  returnvalue = []

									  for v in list:

									    returnvalue.append(v.name)

									    print v.name

									  print "++++++++++++获取单个对象++++++++++++++++++"

									  # 获取单个对象

									  response1 = Test.objects.filter(id=1)

									  print response1

									  for v1 in response1:

									    returnvalue2 = "id : ", v1.id, " 姓名：", v1.name

									    print returnvalue2

									  print "++++++++++++限制返回的数据 相当于 SQL 中的 OFFSET 0 LIMIT 2;++++++++++++++++++"

									  response2 = Test.objects.order_by('name')[0:2]

									  returnvalue3 = {}

									  for v2 in response2:

									    returnvalue3[v2.id] = v2.name

									  print returnvalue3.items()

									  print "+++++++++++输出结果：++++++++++++++++++++++++++++++"

									  return HttpResponse(returnvalue3.items())

									#修改数据可以使用 save() 或 update():

									def updateDB(request):

									  # 修改其中一个id=1的name字段，再save，相当于SQL中的UPDATE

									  test1 = Test.objects.get(id=1)

									  test1.name = 'Google'

									  test1.save()

									  # 另外一种方式 

									  #Test.objects.filter(id=1).update(name='Google') 

									  # 修改所有的列 

									  # Test.objects.all().update(name='Google')

									  return HttpResponse("更新数据成功")

									def deleteDB(request):

									  # 删除id=1的数据

									  test1 = Test.objects.get(id=3)

									  test1.delete()

									  return HttpResponse("删除数据成功")

2、urls.py

									"""pythondjango URL Configuration

									The `urlpatterns` list routes URLs to views. For more information please see:

									  https://docs.djangoproject.com/en/1.11/topics/http/urls/

									Examples:

									Function views

									  1. Add an import: from my_app import views

									  2. Add a URL to urlpatterns: url(r'^$', views.home, name='home')

									Class-based views

									  1. Add an import: from other_app.views import Home

									  2. Add a URL to urlpatterns: url(r'^$', Home.as_view(), name='home')

									Including another URLconf

									  1. Import the include() function: from django.conf.urls import url, include

									  2. Add a URL to urlpatterns: url(r'^blog/', include('blog.urls'))

									"""

									from django.conf.urls import url

									from django.contrib import admin

									from BlogDjango import views

									from polls import views as pollsviews, search, search2

									urlpatterns = [

									  url(r'^admin/', admin.site.urls),

									  url(r'^hello/+\d', views.hello),

									  url(r'^base/', views.base),

									  url(r'^testdb$', pollsviews.testdb),

									  url(r'^querydb$', pollsviews.selectDB),

									  url(r'^updateDB$', pollsviews.updateDB),

									  url(r'^deleteDB$', pollsviews.deleteDB),

									]

3、models.py

									# -*- coding: utf-8 -*-

									from __future__ import unicode_literals

									from django.db import models

									# Create your models here.

									class Test(models.Model):

									  name = models.CharField(max_length=20)