Question

从下面我可以看到，我正在尝试更新记录但由于某种原因我收到了这些错误。我一直在关注Peewee的文档，我发现其他一些人有同样的问题但没有使用Djano的ORM而不是Peewee。我试着投入＆＃34; __＆＃34;而不是＆＃34;。＆＃34;没有任何运气的分类器。

经过测试的代码

Python 2.7.9 (default, Feb  1 2015, 21:31:28) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from Wee_Models import Thunderdome, ThunderdomeLog
>>> from peewee import *
>>> import peewee
>>> db = MySQLDatabase(database="GrabaDB", host="localhost", port=3306, user="demo", passwd="demo")
>>> q = Thunderdome.update(status='Updated status').where(Thunderdome.port='2310')
  File "<stdin>", line 1
SyntaxError: keyword can't be an expression
>>> q = Thunderdome.update(status='Updated status').where(Thunderdome__port='2310')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/peewee.py", line 272, in inner
    func(clone, *args, **kwargs)
TypeError: where() got an unexpected keyword argument 'Thunderdome__port'
>>>

Thunderdome模型：

class Thunderdome(BaseModel):
    date = DateTimeField()
    lock_status = IntegerField()
    port = PrimaryKeyField()
    security_key = TextField(null=True)
    serial = TextField(null=True)
    status = TextField(null=True)

    class Meta:
        db_table = 'ThunderDome'

我正在关注Peewee的文件：

http://peewee.readthedocs.org/en/latest/peewee/api.html#Model.update

http://peewee.readthedocs.org/en/latest/peewee/querying.html

Updating existing records
Once a model instance has a primary key, any subsequent call to save() will result in an UPDATE rather than another INSERT. The model’s primary key will not change:

>>> user.save()  # save() returns the number of rows modified.
1
>>> user.id
1
>>> user.save()
>>> user.id
1
>>> huey.save()
1
>>> huey.id
2
If you want to update multiple records, issue an UPDATE query. The following example will update all Tweet objects, marking them as published, if they were created before today. Model.update() accepts keyword arguments where the keys correspond to the model’s field names:

>>> today = datetime.today()
>>> query = Tweet.update(is_published=True).where(Tweet.creation_date < today)
>>> query.execute()  # Returns the number of rows that were updated.
4
For more information, see the documentation on Model.update() and UpdateQuery.

Answer 1

你必须写：

q = Thunderdome.update(status='Updatedstatus')\
     .where(Thunderdome.port == '2310')

请参阅文档http://docs.peewee-orm.com/en/latest/peewee/api.html?highlight=update#Model.update

Peewee Model关键字不能成为Update上的表达式

1 个答案: