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
