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)