Python 如何将mysql查询转换为django模型'；什么是ORM？

这是我的mysql查询

SELECT DeviceUID, Max(LogTime) , count(DeviceUID), Mode
 FROM P2PLog.ConnectResult_Table group by DeviceUID;

如何将此代码转换为ORM

我试着去做这件事。我需要选择

Max（LogTime）

作为列。我该怎么办

>>> ct = ConnectresultTable.objects
>>> aaa = ct.values('deviceuid', 'mode').annotate(items=Count('deviceuid'))
>>> print aaa.query
SELECT `ConnectResult_Table`.`DeviceUID`, `ConnectResult_Table`.`Mode`, COUNT(`C
onnectResult_Table`.`DeviceUID`) AS `items` FROM `ConnectResult_Table` GROUP BY
`ConnectResult_Table`.`DeviceUID`, `ConnectResult_Table`.`Mode` ORDER BY NULL

---

$python manage.py inspectdb

运行此命令

$ python manage.py inspectdb > models.py    Save your file using Unix.

class Person(models.Model):
    id = models.IntegerField(primary_key=True)
    first_name = models.CharField(max_length=70)
    class Meta:
       managed = False
       db_table = 'CENSUS_PERSONS'       ( Create unmanaged modes, managed=false)


$ python manage.py migrate   ( And install this)

---

我终于自己得到了答案。谢谢大家

>>> ct = ConnectresultTable.objects
>>> aaa = p2p_ct.values('deviceuid', 'mode').annotate(items=Count('deviceuid'),
new_status=Max('logtime'))
>>> print aaa.query
SELECT `ConnectResult_Table`.`DeviceUID`, `ConnectResult_Table`.`Mode`, COUNT(`C
onnectResult_Table`.`DeviceUID`) AS `items`, MAX(`ConnectResult_Table`.`LogTime`
) AS `new_status` FROM `ConnectResult_Table` GROUP BY `ConnectResult_Table`.`Dev
iceUID`, `ConnectResult_Table`.`Mode` ORDER BY NULL