[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Wrong: filter("checkpoint_id=", bus.checkpoint_id)
Right:filter("checkpoint_id =", bus.checkpoint_id)
2009/4/22 风笑雪 :
> You mean this?
> Wrong: filter("checkpoint_id=", bus.checkpoint_id)
> Right:filter("checkpoint_id= ", bus.checkpoint_id)
>
> 2009/4/22 Dmitry Kachaev
>>
>> I got it, thanks all!
>>
>> It was a lack of space between property name and operator in filter()
>> method. It led to empty result (but not an exception???)
>>
>> -Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Exactly.
Looking at exceptions reference I would expect BadQueryError or
BadArgumentError to be raised in wrong call.
Thanks again for helping me on this.
-Dmitry
On Apr 22, 7:26 am, 风笑雪 wrote:
> You mean this?
> Wrong: filter("checkpoint_id=", bus.checkpoint_id)
> Right:filter("checkpoint_id= ", bus.checkpoint_id)
>
> 2009/4/22 Dmitry Kachaev
>
>
>
> > I got it, thanks all!
>
> > It was a lack of space between property name and operator in filter()
> > method. It led to empty result (but not an exception???)
>
> > -Dmitry
>
> > On Apr 21, 11:52 am, Mark Wolgemuth wrote:
> > > I think your second one may be "working" because using the string
> > > substitution is causing an unexpected value to appear in the query
> > > that still is accepted by the engine. You should generate a log entry
> > > before the query to see what passing the id to %s is actually giving
> > > you.
>
> > > On Apr 21, 8:10 am, Dmitry Kachaev wrote:
>
> > > > Yes, Checkpoint class is defined in models package.
>
> > > > bus.checkpoint_id has value (in both cases, I can see it in debug
> > > > messages)
>
> > > > -Dmitry
>
> > > > On Apr 21, 8:04 am, 风笑雪 wrote:
>
> > > > > Why you use models.Checkpoint?
> > > > > Is the Checkpoint class defines in models package/module?
>
> > > > > If not, use this:
> > > > > point_old = Checkpoint.all().filter("checkpoint_id=",
> > > > > bus.checkpoint_id).get()
>
> > > > > And for the "'NoneType' object has no attribute 'checkpoint_id'", you
> > should
> > > > > check bus.checkpoint_id to ensure it's not None.
>
> > > > > 2009/4/21 Dmitry Kachaev
>
> > > > > > I use following construction to lookup records from datastore:
>
> > > > > >point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > > > =", bus.checkpoint_id).get()
>
> > > > > > It works fine in most scenarios, but sometime I'm getting error
> > like
> > > > > > this:
>
> > > > > > 'NoneType' object has no attribute 'checkpoint_id'
> > > > > > Traceback (most recent call last):
> > > > > > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > > > > > __init__.py", line 501, in __call__
> > > > > >handler.get(*groups)
> > > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > > busupdate.py", line 22, in get
> > > > > >self.update(bus)
> > > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > > busupdate.py", line 45, in update
> > > > > >self.check_points(bus)
> > > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > > busupdate.py", line 86, in check_points
> > > > > >logging.debug("found old checkpoint: %s" %
> > > > > > (point_old.checkpoint_id))
> > > > > > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> > > > > > Basically, get() returns None, but record I looked up is definitely
> > in
> > > > > > datastore.
>
> > > > > > I figured out and replaced this look up call with equivalent GQL
> > call:
>
> > > > > >point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > > > > > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> > > > > >#point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > > > =", bus.checkpoint_id).get()
>
> > > > > > What is wrong? Those constructs should behave the same way, but
> > they
> > > > > > don't. Commented one is not returning a record, when GQL is
> > returning
> > > > > > single record, just fine.
>
> > > > > > Thanks,
> > > > > > Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
You mean this?
Wrong: filter("checkpoint_id=", bus.checkpoint_id)
Right:filter("checkpoint_id= ", bus.checkpoint_id)
2009/4/22 Dmitry Kachaev
>
> I got it, thanks all!
>
> It was a lack of space between property name and operator in filter()
> method. It led to empty result (but not an exception???)
>
> -Dmitry
>
> On Apr 21, 11:52 am, Mark Wolgemuth wrote:
> > I think your second one may be "working" because using the string
> > substitution is causing an unexpected value to appear in the query
> > that still is accepted by the engine. You should generate a log entry
> > before the query to see what passing the id to %s is actually giving
> > you.
> >
> > On Apr 21, 8:10 am, Dmitry Kachaev wrote:
> >
> > > Yes, Checkpoint class is defined in models package.
> >
> > > bus.checkpoint_id has value (in both cases, I can see it in debug
> > > messages)
> >
> > > -Dmitry
> >
> > > On Apr 21, 8:04 am, 风笑雪 wrote:
> >
> > > > Why you use models.Checkpoint?
> > > > Is the Checkpoint class defines in models package/module?
> >
> > > > If not, use this:
> > > > point_old = Checkpoint.all().filter("checkpoint_id=",
> > > > bus.checkpoint_id).get()
> >
> > > > And for the "'NoneType' object has no attribute 'checkpoint_id'", you
> should
> > > > check bus.checkpoint_id to ensure it's not None.
> >
> > > > 2009/4/21 Dmitry Kachaev
> >
> > > > > I use following construction to lookup records from datastore:
> >
> > > > >point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > > =", bus.checkpoint_id).get()
> >
> > > > > It works fine in most scenarios, but sometime I'm getting error
> like
> > > > > this:
> >
> > > > > 'NoneType' object has no attribute 'checkpoint_id'
> > > > > Traceback (most recent call last):
> > > > > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > > > > __init__.py", line 501, in __call__
> > > > >handler.get(*groups)
> > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > busupdate.py", line 22, in get
> > > > >self.update(bus)
> > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > busupdate.py", line 45, in update
> > > > >self.check_points(bus)
> > > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > > busupdate.py", line 86, in check_points
> > > > >logging.debug("found old checkpoint: %s" %
> > > > > (point_old.checkpoint_id))
> > > > > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
> >
> > > > > Basically, get() returns None, but record I looked up is definitely
> in
> > > > > datastore.
> >
> > > > > I figured out and replaced this look up call with equivalent GQL
> call:
> >
> > > > >point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > > > > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> > > > >#point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > > =", bus.checkpoint_id).get()
> >
> > > > > What is wrong? Those constructs should behave the same way, but
> they
> > > > > don't. Commented one is not returning a record, when GQL is
> returning
> > > > > single record, just fine.
> >
> > > > > Thanks,
> > > > > Dmitry
> >
>
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
I got it, thanks all!
It was a lack of space between property name and operator in filter()
method. It led to empty result (but not an exception???)
-Dmitry
On Apr 21, 11:52 am, Mark Wolgemuth wrote:
> I think your second one may be "working" because using the string
> substitution is causing an unexpected value to appear in the query
> that still is accepted by the engine. You should generate a log entry
> before the query to see what passing the id to %s is actually giving
> you.
>
> On Apr 21, 8:10 am, Dmitry Kachaev wrote:
>
> > Yes, Checkpoint class is defined in models package.
>
> > bus.checkpoint_id has value (in both cases, I can see it in debug
> > messages)
>
> > -Dmitry
>
> > On Apr 21, 8:04 am, 风笑雪 wrote:
>
> > > Why you use models.Checkpoint?
> > > Is the Checkpoint class defines in models package/module?
>
> > > If not, use this:
> > > point_old = Checkpoint.all().filter("checkpoint_id=",
> > > bus.checkpoint_id).get()
>
> > > And for the "'NoneType' object has no attribute 'checkpoint_id'", you
> > > should
> > > check bus.checkpoint_id to ensure it's not None.
>
> > > 2009/4/21 Dmitry Kachaev
>
> > > > I use following construction to lookup records from datastore:
>
> > > >point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > =", bus.checkpoint_id).get()
>
> > > > It works fine in most scenarios, but sometime I'm getting error like
> > > > this:
>
> > > > 'NoneType' object has no attribute 'checkpoint_id'
> > > > Traceback (most recent call last):
> > > > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > > > __init__.py", line 501, in __call__
> > > >handler.get(*groups)
> > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > busupdate.py", line 22, in get
> > > >self.update(bus)
> > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > busupdate.py", line 45, in update
> > > >self.check_points(bus)
> > > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > > busupdate.py", line 86, in check_points
> > > >logging.debug("found old checkpoint: %s" %
> > > > (point_old.checkpoint_id))
> > > > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> > > > Basically, get() returns None, but record I looked up is definitely in
> > > > datastore.
>
> > > > I figured out and replaced this look up call with equivalent GQL call:
>
> > > >point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > > > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> > > >#point_old=models.Checkpoint.all().filter("checkpoint_id
> > > > =", bus.checkpoint_id).get()
>
> > > > What is wrong? Those constructs should behave the same way, but they
> > > > don't. Commented one is not returning a record, when GQL is returning
> > > > single record, just fine.
>
> > > > Thanks,
> > > > Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
I think your second one may be "working" because using the string
substitution is causing an unexpected value to appear in the query
that still is accepted by the engine. You should generate a log entry
before the query to see what passing the id to %s is actually giving
you.
On Apr 21, 8:10 am, Dmitry Kachaev wrote:
> Yes, Checkpoint class is defined in models package.
>
> bus.checkpoint_id has value (in both cases, I can see it in debug
> messages)
>
> -Dmitry
>
> On Apr 21, 8:04 am, 风笑雪 wrote:
>
> > Why you use models.Checkpoint?
> > Is the Checkpoint class defines in models package/module?
>
> > If not, use this:
> > point_old = Checkpoint.all().filter("checkpoint_id=",
> > bus.checkpoint_id).get()
>
> > And for the "'NoneType' object has no attribute 'checkpoint_id'", you should
> > check bus.checkpoint_id to ensure it's not None.
>
> > 2009/4/21 Dmitry Kachaev
>
> > > I use following construction to lookup records from datastore:
>
> > >point_old=models.Checkpoint.all().filter("checkpoint_id
> > > =", bus.checkpoint_id).get()
>
> > > It works fine in most scenarios, but sometime I'm getting error like
> > > this:
>
> > > 'NoneType' object has no attribute 'checkpoint_id'
> > > Traceback (most recent call last):
> > > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > > __init__.py", line 501, in __call__
> > >handler.get(*groups)
> > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > busupdate.py", line 22, in get
> > >self.update(bus)
> > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > busupdate.py", line 45, in update
> > >self.check_points(bus)
> > > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > > busupdate.py", line 86, in check_points
> > >logging.debug("found old checkpoint: %s" %
> > > (point_old.checkpoint_id))
> > > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> > > Basically, get() returns None, but record I looked up is definitely in
> > > datastore.
>
> > > I figured out and replaced this look up call with equivalent GQL call:
>
> > >point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> > >#point_old=models.Checkpoint.all().filter("checkpoint_id
> > > =", bus.checkpoint_id).get()
>
> > > What is wrong? Those constructs should behave the same way, but they
> > > don't. Commented one is not returning a record, when GQL is returning
> > > single record, just fine.
>
> > > Thanks,
> > > Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Yes, Checkpoint class is defined in models package.
bus.checkpoint_id has value (in both cases, I can see it in debug
messages)
-Dmitry
On Apr 21, 8:04 am, 风笑雪 wrote:
> Why you use models.Checkpoint?
> Is the Checkpoint class defines in models package/module?
>
> If not, use this:
> point_old = Checkpoint.all().filter("checkpoint_id=",
> bus.checkpoint_id).get()
>
> And for the "'NoneType' object has no attribute 'checkpoint_id'", you should
> check bus.checkpoint_id to ensure it's not None.
>
> 2009/4/21 Dmitry Kachaev
>
>
>
> > I use following construction to lookup records from datastore:
>
> >point_old=models.Checkpoint.all().filter("checkpoint_id
> > =", bus.checkpoint_id).get()
>
> > It works fine in most scenarios, but sometime I'm getting error like
> > this:
>
> > 'NoneType' object has no attribute 'checkpoint_id'
> > Traceback (most recent call last):
> > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > __init__.py", line 501, in __call__
> >handler.get(*groups)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 22, in get
> >self.update(bus)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 45, in update
> >self.check_points(bus)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 86, in check_points
> >logging.debug("found old checkpoint: %s" %
> > (point_old.checkpoint_id))
> > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> > Basically, get() returns None, but record I looked up is definitely in
> > datastore.
>
> > I figured out and replaced this look up call with equivalent GQL call:
>
> >point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> >#point_old=models.Checkpoint.all().filter("checkpoint_id
> > =", bus.checkpoint_id).get()
>
> > What is wrong? Those constructs should behave the same way, but they
> > don't. Commented one is not returning a record, when GQL is returning
> > single record, just fine.
>
> > Thanks,
> > Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Apologies, my previous message was in error. Without more of your
source, it's hard to tell what's going wrong, though.
Also, this pattern:
db.GqlQuery("SELECT * FROM Checkpoint WHERE checkpoint_id = %s" %
(bus.checkpoint_id))
is extremely dangerous. You should never, ever do string substitution
in a GQL (or SQL!) query. GQL directly supports parameterized queries,
so instead you can equivalently (and far more safely) do:
db.GqlQuery("SELECT * FROM Checkpoint WHERE checkpoint_id = :1",
bus.checkpoint_id)
-Nick Johnson
On Apr 21, 1:07 pm, "Nick Johnson (Google)"
wrote:
> Hi Dmitry,
>
> The issue here isn't with the query, but with your code that's calling
> it. Python is throwing an exception because your variable 'bus' that
> you're trying to fetch checkpoint_id on is set to None, not because
> the result of the query is None. The query code never gets run.
>
> -Nick Johnson
>
> On Apr 21, 12:56 pm, Dmitry Kachaev wrote:
>
> > I use following construction to lookup records from datastore:
>
> > point_old=models.Checkpoint.all().filter("checkpoint_id
> > =", bus.checkpoint_id).get()
>
> > It works fine in most scenarios, but sometime I'm getting error like
> > this:
>
> > 'NoneType' object has no attribute 'checkpoint_id'
> > Traceback (most recent call last):
> > File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> > __init__.py", line 501, in __call__
> > handler.get(*groups)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 22, in get
> > self.update(bus)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 45, in update
> > self.check_points(bus)
> > File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> > busupdate.py", line 86, in check_points
> > logging.debug("found old checkpoint: %s" %
> > (point_old.checkpoint_id))
> > AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> > Basically, get() returns None, but record I looked up is definitely in
> > datastore.
>
> > I figured out and replaced this look up call with equivalent GQL call:
>
> > point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> > checkpoint_id = %s" % (bus.checkpoint_id)).get()
> > #point_old=models.Checkpoint.all().filter("checkpoint_id
> > =", bus.checkpoint_id).get()
>
> > What is wrong? Those constructs should behave the same way, but they
> > don't. Commented one is not returning a record, when GQL is returning
> > single record, just fine.
>
> > Thanks,
> > Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Hi Dmitry,
The issue here isn't with the query, but with your code that's calling
it. Python is throwing an exception because your variable 'bus' that
you're trying to fetch checkpoint_id on is set to None, not because
the result of the query is None. The query code never gets run.
-Nick Johnson
On Apr 21, 12:56 pm, Dmitry Kachaev wrote:
> I use following construction to lookup records from datastore:
>
> point_old=models.Checkpoint.all().filter("checkpoint_id
> =", bus.checkpoint_id).get()
>
> It works fine in most scenarios, but sometime I'm getting error like
> this:
>
> 'NoneType' object has no attribute 'checkpoint_id'
> Traceback (most recent call last):
> File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> __init__.py", line 501, in __call__
> handler.get(*groups)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 22, in get
> self.update(bus)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 45, in update
> self.check_points(bus)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 86, in check_points
> logging.debug("found old checkpoint: %s" %
> (point_old.checkpoint_id))
> AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> Basically, get() returns None, but record I looked up is definitely in
> datastore.
>
> I figured out and replaced this look up call with equivalent GQL call:
>
> point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> checkpoint_id = %s" % (bus.checkpoint_id)).get()
> #point_old=models.Checkpoint.all().filter("checkpoint_id
> =", bus.checkpoint_id).get()
>
> What is wrong? Those constructs should behave the same way, but they
> don't. Commented one is not returning a record, when GQL is returning
> single record, just fine.
>
> Thanks,
> Dmitry
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[google-appengine] Re: Query() vs. GqlQuery() different results for the same queries (Python)
Why you use models.Checkpoint?
Is the Checkpoint class defines in models package/module?
If not, use this:
point_old = Checkpoint.all().filter("checkpoint_id=",
bus.checkpoint_id).get()
And for the "'NoneType' object has no attribute 'checkpoint_id'", you should
check bus.checkpoint_id to ensure it's not None.
2009/4/21 Dmitry Kachaev
>
> I use following construction to lookup records from datastore:
>
>point_old=models.Checkpoint.all().filter("checkpoint_id
> =", bus.checkpoint_id).get()
>
> It works fine in most scenarios, but sometime I'm getting error like
> this:
>
> 'NoneType' object has no attribute 'checkpoint_id'
> Traceback (most recent call last):
> File "/base/python_lib/versions/1/google/appengine/ext/webapp/
> __init__.py", line 501, in __call__
>handler.get(*groups)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 22, in get
>self.update(bus)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 45, in update
>self.check_points(bus)
> File "/base/data/home/apps/xxx/1.332943763447248076/tasks/
> busupdate.py", line 86, in check_points
>logging.debug("found old checkpoint: %s" %
> (point_old.checkpoint_id))
> AttributeError: 'NoneType' object has no attribute 'checkpoint_id'
>
> Basically, get() returns None, but record I looked up is definitely in
> datastore.
>
> I figured out and replaced this look up call with equivalent GQL call:
>
>point_old = db.GqlQuery("SELECT * FROM Checkpoint WHERE
> checkpoint_id = %s" % (bus.checkpoint_id)).get()
>#point_old=models.Checkpoint.all().filter("checkpoint_id
> =", bus.checkpoint_id).get()
>
> What is wrong? Those constructs should behave the same way, but they
> don't. Commented one is not returning a record, when GQL is returning
> single record, just fine.
>
> Thanks,
> Dmitry
> >
>
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