from django.dbimportmodelsclassStudent(models.Model):FRESHMAN='FR'SOPHOMORE='SO'JUNIOR='JR'SENIOR='SR'GRADUATE='GR'YEAR_IN_SCHOOL_CHOICES=[(FRESHMAN,'Freshman'),(SOPHOMORE,'Sophomore'),(JUNIOR,'Junior'),(SENIOR,
设置主键primary_key 新增一张用户表,表名为user 字段user_name(主键), psw ,mail 都是字符串类型,我们设置user_name为主键,让用户名不重复,设计如下 # models.pyfromdjango.dbimportmodels# Create your models here.# 我们新建了一个Person类,继承自models.Model,classPerson(models.Model): name = models.Cha...
设置主键primary_key 新增一张用户表,表名为Users,字段user_name(主键),psw,mail都是字符串类型,我们设置user_name为主键,让用户名不重复,设计如下 1 2 3 4 5 6 7 8 9 10 11 12 13 #models.py fromdjango.dbimportmodels # Create your models here. classUser(models.Model): name=models.CharField(m...
In Django, each model has a primary key. By default, this primary key consists of a single field. In most cases, a single primary key should suffice. In database design, however, defining a primary key consisting of multiple fields is sometimes necessary. ...
在Django中创建自定义AutoField primary_key条目的方法如下: 首先,在Django的模型类中定义一个字段,并将其设置为AutoField类型。AutoField字段会自动递增生成唯一的主键值。 代码语言:txt 复制 from django.db import models class MyModel(models.Model): my_primary_key = models.AutoField(primary_key=True)...
I am using model inheritance and when I set my own primary_key in the parent class as one of the fields I define, when I try to create child objects with the same primary key I am NOT getting a duplicate error. Instead, it is overwriting the parent class fields. In the two child ...
django,models怎么把两个字段设成primary key?5 class Times(models.Model): number=models.ForeignKey(Number) ID=models.ForeignKey(Station) time=models.DateTimeField() def __unicode__(self): return '%s,%d'%(self.number,self.ID) 我想把number和ID设成primary key怎么操作? 问题补充: jimmykuu 写道 ...
prefetch_related failed if prefetching by char primary key. Django version 1.11.3 Python 2.7 reproducible steps: 1) django-admin startproject pk_string 2) cd pk_string 3) django-admin startapp users 4) update users.models # -*- coding: utf-8 -*-from__future__importunicode_literalsfromdjan...
Django2.0修改表结构的时候一直出现这个问题,查阅了很多资料没有找到解决方案。 经研究,现问题已解决,将解决方案记录如下。 0、先检查是否有重复设置主键的情况存在 1、进入要修改的那个APP的目录 2、进入migrations文件夹 3、删去除了__init__.py之外的所有py文件 4、进入__pycache__文件夹 5、删去除了__init...
facility_id = models.AutoField(primary_key=True) Is this the reason that errors comeup? How do I fix it ? Thank you for help PS: export is OK. jsma commented Feb 22, 2015 There's nothing wrong with your model or id field. The problem is with django-import-export. Apparently djang...