Django Existing model add field

How do I add a field to a model that Django already exists?

First find the corresponding model name in the model.py file, add the fields that need to be added

Then python manage.py sqlall database name

Find the SQL statement of the newly added field and record it

Execute the Python manage.py shell again

Execute the following command

 from Import connectioncursor=connection.cursor () cursor.execute ('ALTER TABLE tablename ADD COLUMN columnname varchar (255) Not NULL')

Added successfully, can view database validation

Django Existing model add field