python django 增删改查操作 数据库Mysql

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)

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