#创建班级表

class Classes(models.Model):

    title = models.CharField(max_length=32)

    n=models.ManyToManyField('Teachers')

#创建老师表

class Teachers(models.Model):

    name= models.CharField(max_length=32)

    age=models.IntegerField(default=30)

    gender=models.BooleanField(default=False)

    is_married=models.BooleanField(default=True)

    address = models.CharField(max_length=50,default='xiaogan')

#创建学生表

class Student(models.Model):

    username=models.CharField(max_length=32)

    age=models.IntegerField()

    #只能写true和false

    gender=models.BooleanField()

    cs=models.ForeignKey(Classes,on_delete=models.DO_NOTHING)

    address=models.CharField(max_length=50,default='xiaogan')