python django add delete change and search database Mysql

The following is an introduction to the operation of django:

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.
#  To solve the code 
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
#  Database operation 
def testdb(request):
  test1 = Test(name=' WenHongYu 2')
  test1.save()
  return HttpResponse("<p> Data added successfully! </p>")

#  Query database 
def selectDB(request):

  #  through objects The model manager all() Get all data rows, equivalent to SQL In the SELECT * FROM
  list = Test.objects.all()
  returnvalue = []
  for v in list:
    returnvalue.append(v.name)
    print v.name

  print "++++++++++++ Get a single object ++++++++++++++++++"
  #  Get a single object 
  response1 = Test.objects.filter(id=1)
  print response1
  for v1 in response1:
    returnvalue2 = "id : ", v1.id, "  Name: ", v1.name
    print returnvalue2

  print "++++++++++++ Limit the data returned   The equivalent of  SQL  In the  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 "+++++++++++ Output results: ++++++++++++++++++++++++++++++"
  return HttpResponse(returnvalue3.items())

# Modifying data can be used  save()  or  update():
def updateDB(request):
  #  Modify the 1 a id=1 the name Field, save , which is equivalent to SQL In the UPDATE
  test1 = Test.objects.get(id=1)
  test1.name = 'Google'
  test1.save()

  #  In addition 1 Kind of way  
  #Test.objects.filter(id=1).update(name='Google') 
  #  Modify all columns  
  # Test.objects.all().update(name='Google')

  return HttpResponse(" Update data successfully ")

def deleteDB(request):
  #  delete id=1 The data of 
  test1 = Test.objects.get(id=3)
  test1.delete()
  return HttpResponse(" Data deletion successful ")

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)