import pymysql
pymysql.install_as_MySQLdb()

DATABASES = {
  'default': {
    'ENGINE': 'django.db.backends.mysql',
    'NAME': 's22', #连接的库名，这个要事先存在
    'HOST':"127.0.0.1",
    'PORT':3306,
    'USER':"root",
    'PASSWORD':"123", #这里要用引号
  }
}

#静态文件位置比如用来存放 bootstrap样式，jquery-3.3.1.min.js
STATIC_URL = '/static/'
STATICFILES_DIRS=[
  os.path.join(BASE_DIR,"static"),
  os.path.join(BASE_DIR,"static99"),
]

G:\study\day18\test1> python manage.py startapp app01

INSTALLED_APPS = [
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'app01.apps.App01Config', #你在命令行创建app时要注意添加
]

from django.db import models
# Create your models here.
class Book(models.Model):
  # 定义一个自增的id主键
  id = models.AutoField(primary_key=True)
  # 定义一个最大长度为32的varchar字段
  title = models.CharField(max_length=32)

python manage.py makemigrations #检测app/models.py文件的改动
python manage.py migrate     #把上面的改动翻译成sql语句，然后去数据库中执行

mysql> show tables;
+----------------------------+
| Tables_in_s22       |
+----------------------------+
| app01_book         |
| auth_group         |
| auth_group_permissions   |
| auth_permission      |
| auth_user         |
| auth_user_groups      |
| auth_user_user_permissions |
| django_admin_log      |
| django_content_type    |
| django_migrations     |
| django_session       |
+----------------------------+
11 rows in set (0.00 sec)

models.py

#class Book(models.Model):
#   # 定义一个自增的id主键
#   id = models.AutoField(primary_key=True)
#   # 定义一个最大长度为32的varchar字段
#   title = models.CharField(max_length=32)

python manage.py makemigrations
python manage.py migrate