django的models新增数据库表时,如果不设置主键,会默认新增一个id为主键,如果我们想自己设置一个字段为主键,需加个参数primary_key=True
默认id主键新增一张用户表,表名为user 字段user_name, psw ,mail 都是字符串类型,设计如下
# models.py from django.db import models # Create your models here. # 我们新建了一个Person类,继承自models.Model, class Person(models.Model): name = models.CharField(max_length=30) age = models.IntegerField() # 新增一张用户表,表名为user 字段user_name, psw ,mail 都是字符串类型 class User(models.Model): user_name = models.CharField(max_length=30) psw = models.CharField(max_length=30) mail = models.CharField(max_length=30)
cmd执行makemigrations和migrate
python manage.py makemigrations
python manage.py migrate
然后就可以看到hello_user表新增成功了,默认多一个字段id为主键
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.py from django.db import models # Create your models here. # 我们新建了一个Person类,继承自models.Model, class Person(models.Model): name = models.CharField(max_length=30) age = models.IntegerField() # 新增一张用户表,表名为user 字段user_name, psw ,mail 都是字符串类型 class User(models.Model): user_name = models.CharField(max_length=30, primary_key=True) # 设置为主键 psw = models.CharField(max_length=30) mail = models.CharField(max_length=30)
cmd执行makemigrations和migrate
python manage.py makemigrations
python manage.py migrate
然后就可以看到hello_user表新增成功了,主键user_name就会代替默认的id主键了
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