1 增加
增加数据有两种方法。
1)save
通过创建模型类对象,执行对象的save()方法保存到数据库中。
>>> from book.models import BookInfo,PeopleInfo
>>> book = BookInfo(
... name='python入门',
... pub_date='2010-1-1'
... )
>>> book.save()
>>> book
<BookInfo: python入门>
2)create
通过模型类.objects.create()保存。
>>> PeopleInfo.objects.create(
... name='itheima',
... book=book
... )
<PeopleInfo: itheima>
2 修改
修改更新有两种方法
1)save
修改模型类对象的属性,然后执行save()方法
>>> person = PeopleInfo.objects.get(name='itheima')
>>> person.name = 'itcast'
>>> person.save()
>>> person
<PeopleInfo: itcast>
2)update
使用模型类.objects.filter().update(),会返回受影响的行数
>>> PeopleInfo.objects.filter(name='itcast').update(name='传智播客')
1
3 删除
删除有两种方法
1)模型类对象delete
>>> person = PeopleInfo.objects.get(name='传智播客')
>>> person.delete()
(1, {'book.PeopleInfo': 1})
2)模型类.objects.filter().delete()
>>> BookInfo.objects.filter(name='python入门').delete()
(1, {'book.BookInfo': 1, 'book.PeopleInfo': 0})
import os
import sys
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "bookmanager00.settings")
try:
from django.core.management import execute_from_command_line
except ImportError:
# The above import may fail for some other reason. Ensure that the
# issue is really that Django is missing to avoid masking other
# exceptions on Python 2.
try:
import django
except ImportError:
raise ImportError(
"Couldn't import Django. Are you sure it's installed and "
"available on your PYTHONPATH environment variable? Did you "
"forget to activate a virtual environment?"
)
raise
execute_from_command_line(sys.argv)