2008年11月15日土曜日

ReferenceProperty failed to be resolved

ReferenceProperty を利用した場合、データの削除は注意



Traceback (most recent call last):
File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 499, in __call__
handler.get(*groups)
File "/base/data/home/apps/blog-reader/1.329303600108062391/imgurl.py", line 226, in get
ImgList = imgurl_get_cache(site,server,title_lang)
File "/base/data/home/apps/blog-reader/1.329303600108062391/imgurl.py", line 308, in imgurl_get_cache
rssItems += ""
File "/base/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 2421, in __get__
raise Error('ReferenceProperty failed to be resolved')
Error: ReferenceProperty failed to be resolved

投稿者 kwin786 時刻: 21:25

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SQL and GQL　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　TOP

is null from google.appengine.ext import db
r = db.GqlQuery ("SELECT * FROM model WHERE property=:1",None) # None is the python Null. / see
count(*) r.count()
like r = db.GqlQuery("SELECT * FROM model WHERE property >= :1 and property < :2 ", search_key, urllib.unquote(search_key).decode("utf8") + u"\uFFFD" )
update see
!=!= # see
dateyymm = '2008-05-10 22:22:22' # see ydate = datetime.datetime.strptime(yymm, '%Y-%m-%d %H:%M:%S')
日付検索 from datetime import *
import datetime
d1 = datetime.datetime.strptime('2008-06-01', '%Y-%m-%d')
d2 = d1 + timedelta(days=10)
r = db.GqlQuery("select * from model where date >=:1 and date <:2 ",d1,d2)
　for rr in r: print datetime.datetime.strftime(rr,'%Y-%m-%d %H:%M:%S')
Dates and Times
datastore viewer
http://localhost:8080/_ah/admin/datastore?kind=StockSum&order=-nikkei_max&order_type=float&num=100&start=0
referencesee (back-references), Many-to-many Join
key, key_name ,id Key names and IDs cannot be used like property values
× select * from Greeting where key = "xxxx"
× select * from Greeting where id = xxx
○ r = Greeting.get(db.Key.from_path('Greeting', id)) # or key_name
○ r = db.get("agpoZWxsb3dvcmxkcgsLEgRCbG9nGNQBDA")
key = r.key()
id = r.key().id()