上一篇文章已经把基础环境搭建好了 

一  创建app

　　D:\学习\python3.7.3\python manage.py startapp blog

　　修改 博客的 models.py

class Blog(models.Model):    title = models.CharField(max_length=50)#这里要注意外键关联 如果 关联的类没有在之前没用定义 那么一定要加引号   这里采用一个博客对应一个博客类型 一一对应blog_type = models.ForeignKey(‘BlogType‘,on_delete=models.DO_NOTHING)    content = models.TextField()    author = models.ForeignKey(User,on_delete=models.DO_NOTHING)    created_time = models.DateTimeField(auto_now_add=True)    last_updated_time = models.DateTimeField(auto_now=True)def __str__(self):return "<Blog: %s>" %self.titleclass BlogType(models.Model):    type_name=models.CharField(max_length=15)def __str__(self):return self.type_name

模板修改好了  还需要修改settings.py 文件

加入    

import pymysql         # 一定要添加这两行！通过pip install pymysql！
pymysql.install_as_MySQLdb()

DATABASES = {
    ‘default‘: {
        ‘ENGINE‘: ‘django.db.backends.mysql‘,
        ‘NAME‘: ‘mysite‘,
        ‘HOST‘: ‘123.2X7.XX9.194‘,
        ‘USER‘: ‘root‘,
        ‘PASSWORD‘: ‘XXX‘,
        ‘PORT‘: ‘3306‘,
    }
}

#修改
LANGUAGE_CODE = ‘zh-Hans‘

TIME_ZONE = ‘Asia/Shanghai‘

USE_I18N = True

USE_L10N = True

USE_TZ = True
INSTALLED_APPS = [    ‘django.contrib.admin‘,    ‘django.contrib.auth‘,    ‘django.contrib.contenttypes‘,    ‘django.contrib.sessions‘,    ‘django.contrib.messages‘,    ‘django.contrib.staticfiles‘,    ‘blog‘,]

安装 pymysql 包  

  将改变应用于 数据库   

>D:\学习\python3.7.3\python manage.py makemigrations

>D:\学习\python3.7.3\python manage.py migrate

 创建超级admin用户

python manage.py  createsuperuserr

 最后 为了能在admin里面显示 需要admin.py里面注册一下

from .models import BlogType,Blog

@admin.register(BlogType)
class BlogTypeAdmin(admin.ModelAdmin):
    list_display = ("id", "type_name")

@admin.register(Blog)
class BlogAdmin(admin.ModelAdmin):
    list_display = ("title","blog_type","author","create_time","last_updated_time" )
# Register your models here.



##也可以
#admin.site.register(BlogType) 这样注册的确定是 全部都会显示在后台

 启动项目发现报错

raise ImproperlyConfigured(‘mysqlclient 1.3.13 or newer is required; you have %s.‘ % Database.__version__)

修改配置文件 注释报错

  继续启动还是报错

query = query.decode(errors=‘replace‘)
AttributeError: ‘str‘ object has no attribute ‘decode‘

 继续修改配置文件 把decode 修改为encode

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