This Django application provides an abstract model, that allows you to transparently retrieve or delete your objects, without having them deleted from your database. You can choose what happens when you delete an object : it can be masked from your database (SOFT_DELETE, the default behavior)...
whose name starts with "John".>>>Article.objects.filter(reporter__full_name__startswith='John')<QuerySet[<Article:Djangoiscool>]># Change an object by altering its attributes and calling save().>>>r.full_name='Billy Goat'>>>r.save()# Delete an object with delete().>>>r.delete()...
pk).update(val=F("val") + 1) # At this point obj.val is still 1, but the value in the database # was updated to 2. The object's updated value needs to be reloaded # from the database. obj.refresh_from_db() self.assertEqual(obj.val, 2) Note that when deferred fields are...
【1】自定义一个BookInfoManager类,实现查寻数据只返回isDelete=False(删除标记(伪删除))的书 【2】使用自定义的manager类 fromdjango.dbimportmodels# 设计和表对应的类,模型类#【1】自定义一个BookInfoManager类classBookInfoManager(models.Manager):#继承自models.Manager'''图书模型管理器类'''# 1.改变原有查...
1.初识Django Python的Web框架 Fask,自身短小精悍+第三方框架 Django,内部集成了很多组件+ 第三方组件 pip install django 目录结构 D:\python3 - python.exe - DLLs - Doc - include - Lib - 内置模块
fromdjango.utilsimporttimezone q=Question(question_text="What'snew?",pub_date=timezone.now()) #Savetheobjectintothedatabase.Youhavetocallsave()explicitly. q.save() #NowithasanID.Notethatthismightsay"1L"insteadof"1",depending #onwhichdatabaseyou'reusing.That'snobiggie;itjustmeansyour #databas...
)defdelete(self,*args,**kwargs):# object is being removed from db,remove the file from ...
announcement = get_object_or_404(Announcement, pk=pk) if request.method=='POST': announcement.delete() return redirect('/') return render(request, 'classroom/announcement_confirm_delete.html') 我的html文件是 {% extends "classroom/base.html" %} ...
CREATE DATABASE db_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; 1. 在html页面中添加 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 1. 解决编码中文乱码问题。 2、数据库增、删、改、查 查询篇
from django.db import models from utils import tools from earth import settings class BaseModel(models.Model): '''公共字段''' is_delete_choice = ( (0, '删除'), (1, '正常') ) is_delete = models.SmallIntegerField(choices=is_delete_choice, default=1, verbose_name='是否被删除') ...