# coding=utf-8
from django.db import models
"""
Django数据库关系:
一对一关系:OneToOneField
多对多关系:ManyToManyField
多对一关系:ForeignKey
"""
## One-to-one relationships
class Place(models.Model):
name = models.CharField(max_length=50)
address = models.CharField(max_length=80)
def __str__(self): # __unicode__ on Python 2
return "%s the place" % self.name
class Restaurant(models.Model):
place = models.OneToOneField(Place, primary_key=True)
serves_hot_dogs = models.BooleanField(default=False)
serves_pizza = models.BooleanField(default=False)
def __str__(self): # __unicode__ on Python 2
return "%s the restaurant" % self.place.name
## CREATE TABLE `db_place` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `name` varchar(50) NOT NULL,
## `address` varchar(80) NOT NULL,
## PRIMARY KEY (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
##
## CREATE TABLE `db_restaurant` (
## `place_id` int(11) NOT NULL,
## `serves_hot_dogs` tinyint(1) NOT NULL,
## `serves_pizza` tinyint(1) NOT NULL,
## PRIMARY KEY (`place_id`),
## CONSTRAINT `db_restaurant_place_id_606d40e1_fk_db_place_id` FOREIGN KEY (`place_id`) REFERENCES `db_place` (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
class Waiter(models.Model):
restaurant = models.ForeignKey(Restaurant)
name = models.CharField(max_length=50)
def __str__(self): # __unicode__ on Python 2
return "%s the waiter at %s" % (self.name, self.restaurant)
# CREATE TABLE `db_waiter` (
# `id` int(11) NOT NULL AUTO_INCREMENT,
# `name` varchar(50) NOT NULL,
# `restaurant_id` int(11) NOT NULL,
# PRIMARY KEY (`id`),
# KEY `db_waiter_ee9d9d3e` (`restaurant_id`),
# CONSTRAINT `db_waiter_restaurant_id_7b6c7331_fk_db_restaurant_place_id` FOREIGN KEY (`restaurant_id`) REFERENCES `db_restaurant` (`place_id`)
# ) ENGINE=InnoDB DEFAULT CHARSET=utf8
#
# >python manage.py syncdb
# Operations to perform:
# Apply all migrations: admin, contenttypes, auth, sessions
# Running migrations:
# Applying contenttypes.0001_initial... OK
# Applying auth.0001_initial... OK
# Applying admin.0001_initial... OK
# Applying sessions.0001_initial... OK
#
# You have installed Django's auth system, and don't have any superusers defined.
# Would you like to create one now? (yes/no): yes
# Username (leave blank to use 'zhangsan'): admin
# Email address: admin@admin.com
# Password:*****
# Password (again):*****
# Superuser created successfully.
#
# >python manage.py makemigrations
# Migrations for 'db':
# 0001_initial.py:
# - Create model Place
# - Create model Restaurant
# - Create model Waiter
#
# >python manage.py migrate
# Operations to perform:
# Apply all migrations: admin, contenttypes, db, auth, sessions
# Running migrations:
# Applying db.0001_initial... OK
## Many-to-many relationships
class Publication(models.Model):
title = models.CharField(max_length=30)
def __str__(self): # __unicode__ on Python 2
return self.title
class Meta:
ordering = ('title',)
class Article(models.Model):
headline = models.CharField(max_length=100)
publications = models.ManyToManyField(Publication)
def __str__(self): # __unicode__ on Python 2
return self.headline
class Meta:
ordering = ('headline',)
## CREATE TABLE `db_publication` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `title` varchar(30) NOT NULL,
## PRIMARY KEY (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
##
##
## CREATE TABLE `db_article` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `headline` varchar(100) NOT NULL,
## PRIMARY KEY (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
##
## CREATE TABLE `db_article_publications` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `article_id` int(11) NOT NULL,
## `publication_id` int(11) NOT NULL,
## PRIMARY KEY (`id`),
## UNIQUE KEY `article_id` (`article_id`,`publication_id`),
## KEY `db_article_publications_a00c1b00` (`article_id`),
## KEY `db_article_publications_72ef6487` (`publication_id`),
## CONSTRAINT `db_article_publicat_publication_id_407fcd4d_fk_db_publication_id` FOREIGN KEY (`publication_id`) REFERENCES `db_publication` (`id`),
## CONSTRAINT `db_article_publications_article_id_b757f51_fk_db_article_id` FOREIGN KEY (`article_id`) REFERENCES `db_article` (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
# >python manage.py makemigrations
# Migrations for 'db':
# 0002_auto_20141013_1311.py:
# - Create model Article
# - Create model Publication
# - Add field publications to article
#
# >python manage.py migrate
# Operations to perform:
# Apply all migrations: admin, contenttypes, db, auth, sessions
# Running migrations:
# Applying db.0002_auto_20141013_1311... OK
## Many-to-one relationships
class Reporter(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
email = models.EmailField()
def __str__(self): # __unicode__ on Python 2
return "%s %s" % (self.first_name, self.last_name)
class Articler(models.Model):
headline = models.CharField(max_length=100)
pub_date = models.DateField()
reporter = models.ForeignKey(Reporter)
def __str__(self): # __unicode__ on Python 2
return self.headline
class Meta:
ordering = ('headline',)
## CREATE TABLE `db_reporter` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `first_name` varchar(30) NOT NULL,
## `last_name` varchar(30) NOT NULL,
## `email` varchar(75) NOT NULL,
## PRIMARY KEY (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
##
## CREATE TABLE `db_articler` (
## `id` int(11) NOT NULL AUTO_INCREMENT,
## `headline` varchar(100) NOT NULL,
## `pub_date` date NOT NULL,
## `reporter_id` int(11) NOT NULL,
## PRIMARY KEY (`id`),
## KEY `db_articler_947bdf92` (`reporter_id`),
## CONSTRAINT `db_articler_reporter_id_26a49a33_fk_db_reporter_id` FOREIGN KEY (`reporter_id`) REFERENCES `db_reporter` (`id`)
## ) ENGINE=InnoDB DEFAULT CHARSET=utf8
# >python manage.py makemigrations
# Migrations for 'db':
# 0003_auto_20141013_1318.py:
# - Create model Articler
# - Create model Reporter
# - Add field reporter to articler
#
# >python manage.py migrate
# Operations to perform:
# Apply all migrations: admin, contenttypes, db, auth, sessions
# Running migrations:
# Applying db.0003_auto_20141013_1318... OK
源码下载:http://git.oschina.net/gitlab/StartWithCoding/tree/master/example/django/django_db_relationships