orm基础字段及选项
字段类型
from django.db import models
# Create your models here.
class Book(models.Model):
title=models.CharField(‘书名‘,max_length=50,default=‘‘)
price=models.DecimalField(‘价格‘,max_digits=7,decimal_places=2)
info=models.CharField(‘描述‘,max_length=100,default=‘‘)
class Author(models.Model):
name=models.CharField(‘姓名‘,max_length=11)
age=models.IntegerField(‘年龄‘)
email=models.EmailField(‘邮箱‘)
blank主要控制admin后台值为空，与null有一定区别
添加修改字段都需要makemigrations 和migrate
针对模型类表的操作
meta类
# Create your models here.
class Book(models.Model):
title=models.CharField(‘书名‘,max_length=50,default=‘‘)
price=models.DecimalField(‘价格‘,max_digits=7,decimal_places=2)
info=models.CharField(‘描述‘,max_length=100,default=‘‘)
class Meta:
db_table=‘book‘
····
C:\Users\Administrator\Desktop\mysite2>python manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, bookstore, contenttypes, sessions
Running migrations:
Applying bookstore.0002_author... OK
C:\Users\Administrator\Desktop\mysite2>python manage.py makemigrations
Migrations for ‘bookstore‘:
bookstore\migrations\0003_auto_20210807_1002.py
- Rename table for book to book
C:\Users\Administrator\Desktop\mysite2>python manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, bookstore, contenttypes, sessions
Running migrations:
Applying bookstore.0003_auto_20210807_1002... OK
mysql> show tables;
+----------------------------+
| Tables_in_mysite2 |
+----------------------------+
| auth_group |
| auth_group_permissions |
| auth_permission |
| auth_user |
| auth_user_groups |
| auth_user_user_permissions |
| book |
| bookstore_author |
| django_admin_log |
| django_content_type |
| django_migrations |
| django_session |
+----------------------------+
12 rows in set (0.00 sec)
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