Django version 1.9 database table creation

Django version 1.9 build data table process:

Environment: windows, pycharm version 4.0, django version 1.9

1. Create a new django project and build an app

file-new project --django --write project name --more setting --write app name --create

2. Set setting.py

Database settings

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'test',                      # Or path to database file if using sqlite3.
        'USER': 'root',                      # Not used with sqlite3.
        'PASSWORD': 'password',                  # Not used with sqlite3.
        'HOST': '10.xxx.xxx.xxx',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '3306',                      # Set to empty string for default. Not used with sqlite3.
    }
}

add app

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'books',
)

3. model.py settings in the app

from django.db import models

class Publisher(models.Model):
    name = models.CharField(max_length=30)
    address = models.CharField(max_length=50)
    city = models.CharField(max_length=60)
    state_province = models.CharField(max_length=30)
    country = models.CharField(max_length=50)
    website = models.URLField()

class Author(models.Model):
    salutation = models.CharField(max_length=10)
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=40)
    email = models.EmailField()
    headshot = models.ImageField(upload_to='/tmp')

class Book (models.Model):
    title = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)
    publisher = models.ForeignKey(Publisher)
    publication_date = models.DateField()

4. Run the command in the project directory

Create a new sql file:

python manage.py makemigrations

$ python manage.py makemigrations
Migrations for 'books':
0001_initial.py:
    - Create model Author
    - Create model Book
    - Create model Publisher
    - Add field publisher to book

update to database

Running: python manage.py migrate

$ python manage.py migrate
Operations to perform:
Synchronize unmigrated apps: staticfiles, messages
Apply all migrations: admin, contenttypes, books, auth, sessions
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying books.0001_initial... OK

5. Complete the establishment of the corresponding table in the database.

The exception to the "one class per database table" rule is a many-to-many relationship. In our paradigm model, Book has a many-to-many field called authors . This field indicates that a book has one or more authors, but the Book database table does not have an authors field. Instead, Django creates an additional table (a many-to-many join table) to handle the mapping between books and authors.

Correspondingly generate a books_book_authors correspondence table

We don't explicitly define any primary keys for these models. Django automatically creates a primary key called id for each model unless you specify it . Every Django model must have a single-column primary key.

Django version 1.9 database table creation

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