django一对一数据库建立和进行数据传输的3种方式all()(对象) values()(字典) values_list()(元组)

class Business(models.Model):
    caption = models.CharField(max_length=32)
    code = models.CharField(max_length=32, null=True)
    # fk = models.ForeignKey(to='Foo', on_delete=models.CASCADE)
class Host(models.Model):
    nid = models.AutoField(primary_key=True)
    hostname = models.CharField(max_length=32, db_index=True)
    ip = models.GenericIPAddressField(db_index=True)
    port = models.IntegerField()
    b = models.ForeignKey(to='Business', on_delete=models.CASCADE, to_field='id')

由Host绑定Business

通过

 b = models.ForeignKey(to='Business', on_delete=models.CASCADE, to_field='id')实现两个数据库的绑定

获取数据的3种方式

1.对象

 v1 = models.Host.objects.filter(nid__gt=0)

2.字典

  v2 = models.Host.objects.filter(nid__gt=0).values('nid', 'hostname', 'b_id', 'b__caption')

3.元组

  v3 = models.Host.objects.filter(nid__gt=0).values_list('nid', 'hostname', 'b_id', 'b__caption')