django--orm--012

　Q,F查询

引包：

from django.db.models import F,Q

单关键字查询

SELECT `myapp_article`.`id`, `myapp_article`.`title`, `myapp_article`.`context`, `myapp_article`.`account_id`, `myapp_article`.`pub_date` F
ROM `myapp_article` WHERE (`myapp_article`.`context` = 'xt' AND `myapp_article`.`title` = 'aa') LIMIT 21; args=('xt', 'aa')

把每本书的价格加10

Book.object.all().update(price=F('price')+10)

|   或的关系  

count3=Article.objects.filter (Q(context="xt")|Q(title='cc'))

SELECT `myapp_article`.`id`, `myapp_article`.`title`, `myapp_article`.`context`, `myapp_ar
ticle`.`account_id`, `myapp_article`.`pub_date` FROM `myapp_article` WHERE (`myapp_article`.`conte
xt` = 'xt' OR `myapp_article`.`title` = 'cc') LIMIT 21; args=('xt', 'cc')

~Q  非的关系