# https://docs.djangoproject.com/en/1.10/ref/settings/#databases # sqlite3数据库连接方式 # DATABASES = { # 'default': { # 'ENGINE': 'django.db.backends.sqlite3', # 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), # } # } # MySQL数据库连接方式 DATABASES = { 'default': { 'E...
classAuthor(models.Model): name=models.CharField(max_length=15) age=models.IntegerField() author_info=models.OneToOneField('Author_Info',on_delete=models.CASCADE) 这是一对一关系创建,第二参数是,自动跟随删除,当作者不在了,随即作者的信息也会删除classMeta: db_table='author'classAuthor_Info(models....
40 from django.db.models import Count, Min, Max, Sum 41 # models.Tb1.objects.filter(c1=1).values(‘id‘).annotate(c=Count(‘num‘)) 42 # SELECT "app01_tb1"."id", COUNT("app01_tb1"."num") AS "c" FROM "app01_tb1" WHERE "app01_tb1"."c1" = 1 GROUP BY "app01_tb1...
fromdjango.dbimportmodelsclassBaseModel(models.Model):deleted=models.BooleanField(default=False,verbose_name='削除フラグ')deleted_by=models.CharField(default="",max_length=30,verbose_name='削除者')created_at=models.DateTimeField(auto_now_add=True,verbose_name='登録日時')updated_at=models.DateTimeFi...
大部分 django-admin 命令像 migrate 一样操作数据库——它们一次只操作一个数据库,使用 --database 来控制所要使用的数据库。 这个规则的一个例外是 makemigrations 命令。它验证数据库中的迁移历史,以便在创建新迁移之前发现现有迁移文件的问题(这可能是修改它们所产生)。默认情况下,它只检查 default 数据库,但建...
The most important part of a model – and the only required part of a model – is the list of database fields it defines. Fields are specified by class attributes. Be careful not to choose field names that conflict with the models API like clean, save, or delete. Example: from django...
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)...
DATABASE_APPS_MAPPING = { 'app01':'db1', 'app02':'db2', } (3)生成数据表并同步数据 分别在app01和app02下创建model类,用于生成数据表: app01: from django.db import models # Create your models here. class ap1(models.Model): username = models.CharField(max_length=30) class Meta: #app...
python manage.py inspectdb --database default Stu > blog\models.py 命令 生成model代码效果: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 # This is an auto-generated Django model module.# You'll have todothe following manually to cleanthisup:#*Rearrange models' order ...
from django.db import models class Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField('date published') class Choice(models.Model): question = models.ForeignKey(Question, on_delete=models.CASCADE) choice_text = models.CharField(max_length=200...