django-admin startproject orm_test

python manage.py runserver

django-admin startapp cmdb

INSTALLED_APPS = [
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'cmdb', #我们创建的应用
]

DATABASES = {
 'default': {
 'ENGINE': 'django.db.backends.mysql',
 'NAME': 'orm_test', #数据库名称
 'USER':'root', #用户
 'PASSWORD':'123456', #密码
 'HOST':'localhost', #IP地址，本地测试为localhost
 'PORT':'3306', #端口号
 }
}

 import pymysql
 pymysql.install_as_MySQLdb()

from django.db import models

# Create your models here.

class users(models.Model):
 username=models.CharField(max_length=32)
 password=models.CharField(max_length=64)

from django.conf.urls import url
from django.contrib import admin
from cmdb import views
urlpatterns = [
 url(r'^admin/', admin.site.urls),
 url(r'^login/', views.login),
]

from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.

from cmdb import models
def login(request):
 #增加
 # models.users.objects.create(username='xsmile',password=12345)
 # models.users.objects.create(username='sofia',password=12345)
 # models.users.objects.create(username='jerry',password=12345)
 #查看
 # result=models.users.objects.all() #查看所有

 # 条件查询，结果为querySet类型，所以循环取出结果
 # result=models.users.objects.filter(username='sofia')
 # for row in result:
 # print(row.id,row.username,row.password)

 #更改
 # models.users.objects.filter(id=2).update(username='eric')
 
 #删除
 #models.users.objects.filter(username='sofia').delete()

 return HttpResponse('Hello World')

#插入一条数据后
mysql> select * from cmdb_users;
+----+----------+----------+
| id | username | password |
+----+----------+----------+
| 1 | xsmile | 12345 |
+----+----------+----------+
1 row in set (0.00 sec)

#再插入三条数据后
mysql> select * from cmdb_users;
+----+----------+----------+
| id | username | password |
+----+----------+----------+
| 1 | xsmile | 12345 |
| 2 | xsmile | 12345 |
| 3 | sofia | 12345 |
| 4 | jerry | 12345 |
+----+----------+----------+
4 rows in set (0.00 sec)

#修改数据后
mysql> select * from cmdb_users;
+----+----------+----------+
| id | username | password |
+----+----------+----------+
| 1 | xsmile | 12345 |
| 2 | eric | 12345 |
| 3 | sofia | 12345 |
| 4 | jerry | 12345 |
+----+----------+----------+
4 rows in set (0.00 sec)

#删除数据后
mysql> select * from cmdb_users;
+----+----------+----------+
| id | username | password |
+----+----------+----------+
| 1 | xsmile | 12345 |
| 2 | eric | 12345 |
| 4 | jerry | 12345 |
+----+----------+----------+
3 rows in set (0.00 sec)

class User(AbstractBaseUser, PermissionsMixin):
 uuid = ShortUUIDField(unique=True)
 username = models.CharField(max_length=100, db_index=True, unique=True, default='')
 schoolid = models.CharField(max_length=100, null=True, blank=True, default='')
 classid = models.CharField(max_length=100, null=True, blank=True, default='')
 fullname = models.CharField(max_length=50, default='', null=True, blank=True)
 email = models.EmailField(_('email address'), blank=True, null=True)
 age = models.SmallIntegerField(default=0)

__gt 大于
__gte 大于等于

User.objects.filter(age__gt=10) // 查询年龄大于10岁的用户
User.objects.filter(age__gte=10) // 查询年龄大于等于10岁的用户

__lt 小于
__lte 小于等于

User.objects.filter(age__lt=10)  // 查询年龄小于10岁的用户
User.objects.filter(age__lte=10) // 查询年龄小于等于10岁的用户

__in

查询年龄在某一范围的用户
User.objects.filter(age__in=[10, 20, 30])

__exact    精确等于 like 'aaa'
__iexact    精确等于 忽略大小写 ilike 'aaa'
__contains   包含 like '%aaa%'
__icontains  包含 忽略大小写 ilike '%aaa%'，但是对于sqlite来说，contains的作用效果等同于icontains。

__isnull 判空

User.objects.filter(username__isnull=True)  // 查询用户名为空的用户
User.objects.filter(username__isnull=False) // 查询用户名不为空的用户

User.objects.filter().excute(age=10)  // 查询年龄不为10的用户
User.objects.filter().excute(age__in=[10, 20]) // 查询年龄不为在 [10, 20] 的用户