一、model文件添加字段

可根據(jù)字段要求設(shè)置屬性，如字段類型、是否為null，默認值等

from django.db import models

# Create your models here.
class Case(models.Model):
    run_time = models.CharField(max_length=100, default='2022-05-20 13:43:38')  # 運行時間點

    def __str__(self):
        return str(self.id)

二、遷移數(shù)據(jù)

1、項目文件下執(zhí)行命令：

#添加遷移事務(wù)
python manage.py makemigrations
#將遷移標記為以應(yīng)用
python manage.py migrate

$ python manage.py makemigrations
Migrations for 'App':
  App/migrations/0019_auto_20220520_1510.py
    - Alter field run_time on case
$ python manage.py migrate
Operations to perform:
  Apply all migrations: App, admin, auth, authtoken, contenttypes, django_cas_ng, sessions
Running migrations:
  Applying App.0019_auto_20220520_1510... OK

2、遷移完成后，將生成遷移文件

3、遷移完成后，新字段添加成功

三、撤銷遷移

1、撤銷上一次遷移數(shù)據(jù)

可以通過 migrate 傳遞上一次遷移的編號來撤銷遷移。
例如，要撤銷最近一次遷移 0020_auto_20220520_1511，進入遷移文件，找到dependencies中信息

dependencies = [
        ('App', '0019_auto_20220520_1510'),
    ]

命令行中執(zhí)行撤銷：
python manage.py migrate App 0019

$ python manage.py migrate App 0019
Operations to perform:
  Target specific migration: 0019_auto_20220520_1510, from App
Running migrations:
  Rendering model states... DONE
  Unapplying App.0020_auto_20220520_1511... OK

2、撤銷應(yīng)應(yīng)用于一個應(yīng)用的所有遷移

python manage.py migrate App zero