This document shows the process of creating and applying database migrations in Django. It defines a Person model class, generates the SQL migration, runs the migration to create the database table, and resets the database to show the migration process.

18. from django.db import models
class Person(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)

19. CREATE TABLE myapp_person (
"id" serial NOT NULL PRIMARY KEY,
"first_name" varchar(30) NOT NULL,
"last_name" varchar(30) NOT NULL
);

30. class Migration(migrations.Migration):
initial = True
dependencies = [ ]
operations = [
migrations.CreateModel(
name='SampleModel1',
fields=[
('id', models.AutoField(auto_created=True,
primary_key=True, serialize=False, verbose_name='ID')),
('name', models.CharField(max_length=200)),
],
),
]

31. $ ./manage.py sqlmigrate app1 0001
BEGIN;
--
-- Create model SampleModel1
--
CREATE TABLE `app1_samplemodel1` (`id` integer
AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(200) NOT
NULL);
COMMIT;

35. $ ./manage.py migrate
Operations to perform:
Apply all migrations: admin, app1, auth,
contenttypes, sessions
Running migrations:
Applying app1.0001_initial... OK

36. id app name applied
12 auth
0008_alter_user_usernam
e_max_length
2017-03-31 05:02:26.307972
13 sessions 0001_initial 2017-03-31 05:02:26.361356
14 app1 0001_initial 2017-03-31 05:29:31.189362

45. $ python manage.py reset_db
You have requested a database reset.
This will IRREVERSIBLY DESTROY
ALL data in the database "migrations_demo".
Are you sure you want to do this?
Type 'yes' to continue, or 'no' to cancel: yes
Reset successful.

48. $ python manage.py showmigrations
admin
[X] 0001_initial
[X] 0002_logentry_remove_auto_add
app1
[X] 0001_initial
auth
[X] 0001_initial
[X] 0002_alter_permission_name_max_length
[X] 0003_alter_user_email_max_length
[X] 0004_alter_user_username_opts
[X] 0005_alter_user_last_login_null
[X] 0006_require_contenttypes_0002
[X] 0007_alter_validators_add_error_messages
[X] 0008_alter_user_username_max_length
contenttypes
[X] 0001_initial
[X] 0002_remove_content_type_name
sessions
[X] 0001_initial