关键步骤:
- 第一步:python manage.py makemigrations 你的项目名称
- 第二步: python manage.py migrate
(.venv) PS D:\python_workpace\django_xitong_shezhi\pythonProject\myproject> python manage.py makemigrations  myproject
 Migrations for 'myproject':
   myproject\migrations\0005_remove_role_role_name1.py
     - Remove field role_name1 from role
 (.venv) PS D:\python_workpace\django_xitong_shezhi\pythonProject\myproject> python manage.py migrate
 Operations to perform:
   Apply all migrations: admin, auth, contenttypes, myproject, sessions
 Running migrations:
  Applying myproject.0005_remove_role_role_name1... OK
  










