Don't use in, just use equal:
q = db.GqlQuery("SELECT * FROM DummyData where x = 'c' and x = 'a'")And you can read this document: http://code.google.com/intl/zh-CN/appengine/docs/python/datastore/entitiesandmodels.html#Lists 2009/4/19 ecognium <ecogn...@gmail.com> > > Hello everyone, I noticed an odd behavior with GQL query when it has > two IN operators and a regular condition. Below is some basic code to > reproduce the problem: > > > class DummyData(db.Model): > x = db.StringListProperty() > y = db.TextProperty() > > class Dummy(webapp.RequestHandler): > def get(self): > d = DummyData() > d.x = ['a', 'b','c'] > d.y = "test" > d.put() > d = DummyData() > d.x = ['c', 'd','e'] > d.y = "test2" > d.put() > > q = db.GqlQuery("SELECT * FROM DummyData where x in ('c') and > x in ('a') ") > results = q.fetch(10) # 10 instead of 2? - useful if you run > the test multiple times > for r in results: > self.response.headers['Content-Type'] = "text/plain" > self.response.out.write("x = " + ",".join(r.x) + " y = " + > r.y + "\n") > > When you run the above code you will see the following output: > x = a,b,c y = test > > However when I replace the above query with the one below, I do not > get any results (even though it should return the same result as > above): > > # Note the addition of y = 'test' > q = db.GqlQuery("SELECT * FROM DummyData where y = 'test' and x in > ('c') and x in ('a') ") > > Although here the IN conditions are the same as '=', my application > actually uses multiple list values.; I am just presenting a simpler > example. > > If someone can confirm the issue, I can open a bug report for this. > > Thanks! > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
