django library management system model creation

 

Library management system, model creation

1, there is provided a database connection settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': "test",
        "USER": "root",
        "PASSWORD": "123321",
        "HOST": "127.0.0.1",
        "PORT" : "3306" ,
    }
}

2, to create a app02, and disposed inside settings.py; in app02 / models.py which model is as follows:

from django.db import models

# Create your models here.

class Book(models.Model):
    name = models.CharField(max_length=32)
    price = models.DecimalField(max_digits=8, decimal_places=2)
    publish_date = models.DateTimeField( auto_now_add= True)
    #添加表关联关系
    publish = models.ForeignKey( to='Publish' )
    authors = models.ManyToManyField( to='Author')


class Publish( models.Model):
    name Models.CharField = (MAX_LENGTH = 32 ) 
    addr = models.CharField (MAX_LENGTH = 64 ) 
    In Email = models.EmailField ()   # internal implementations are charField, defined EmailField to form validation 

class the Author (models.Model): 
    name = models.CharField (MAX_LENGTH = 32 ) 
    Age = models.IntegerField ()
     # Add table relationship 
    authordetail = models.OneToOneField (to = ' authorDetail ' ) 


# cutting table, because they do not put a single common data table, the regular the data also with a separate release sheet, to improve the efficiency of query 
class AuthorDetail (models.Model): 
    addr = models.CharField (MAX_LENGTH = 32 ) 
    Phone= models.IntegerField()

Makemigrations execution and migrate data synchronization, see the source code to create a model table:

 

 

 

 

D:\kindeditor_pro>python manage.py sqlmigrate app02 0001
BEGIN;
--
-- Create model Author
--
CREATE TABLE `app02_author` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(32) NO
T NULL, `age` integer NOT NULL);
--
-- Create model AuthorDetail
--
CREATE TABLE `app02_authordetail` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `addr` varchar(
32) NOT NULL, `phone` integer NOT NULL);
--
-- Create model Book
--
CREATE TABLE `app02_book` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(32) NOT
NULL, `price` numeric(8, 2) NOT NULL, `publish_date` datetime(6) NOT NULL);
CREATE TABLE `app02_book_authors` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `book_id` integ
er NOT NULL, `author_id` integer NOT NULL);
--
-- Create model Publish
--
CREATE TABLE `app02_publish` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(32) N
OT NULL, `addr` varchar(64) NOT NULL, `email` varchar(254) NOT NULL);
--
-- Add field publish to book
--
ALTER TABLE `app02_book` ADD COLUMN `publish_id` integer NOT NULL;
--
-- Add field authordetail to author
--
ALTER TABLE `app02_author` ADD COLUMN `authordetail_id` integer NOT NULL UNIQUE;
ALTER TABLE `app02_book_authors` ADD CONSTRAINT `app02_book_authors_book_id_55aef806_fk_app02_book_i
d` FOREIGN KEY (`book_id`) REFERENCES `app02_book` (`id`);
ALTER TABLE `app02_book_authors` ADD CONSTRAINT `app02_book_authors_author_id_191af2fa_fk_app02_auth
or_id` FOREIGN KEY (`author_id`) REFERENCES `app02_author` (`id`);
ALTER TABLE `app02_book_authors` ADD CONSTRAINT `app02_book_authors_book_id_author_id_1a895ee1_uniq`
 UNIQUE (`book_id`, `author_id`);
ALTER TABLE `app02_book` ADD CONSTRAINT `app02_book_publish_id_79be7951_fk_app02_publish_id` FOREIGN
 KEY (`publish_id`) REFERENCES `app02_publish` (`id`);
ALTER TABLE `app02_author` ADD CONSTRAINT `app02_author_authordetail_id_2bc028c9_fk_app02_authordeta
il_id` FOREIGN KEY (`authordetail_id`) REFERENCES `app02_authordetail` (`id`);
COMMIT;