Thanks all.
Stephen you are right '==' can be used in query. It appears it was just a
problem of some old data .I created fresh database(local) and it worked and
now its working on production too.
Happy Coding.
Ravi.
On Fri, Jan 7, 2011 at 11:26 PM, Stephen Johnson <onepagewo...@gmail.com>wrote:
> That is incorrect. You can specify a filter using the == with a single
> value and a list or set such as
>
> query.setFilter("keywords == keywordParam");
> query.declareParameters("String keywordParam");
>
> This works just fine in JDO on AppEngine.
>
>
>
> On Fri, Jan 7, 2011 at 8:06 AM, Matthew Adams <matt...@matthewadams.me>wrote:
>
>> Your query as written is testing for whether oneLocation is equal to
>> locations and oneCategory is equal to categories. That will never be
>> true (I hope), because a Set<Key> will never equal a Key. What you
>> mean is are they **contained by** their respective collections:
>>
>> select AdPost where locations.contains(oneLocation) &&
>> categories.contains(oneCategory)
>>
>> See section 14.6.2 (p.167) of the JDO 3.0 specification, covering
>> JDOQL filter expressions. Page 170 contains a table of the methods
>> allowed in JDOQL. The JDO 3.0 specification can be downloaded from
>> http://jcp.org/aboutJava/communityprocess/mrel/jsr243/index3.html
>>
>> -matthew
>>
>> On Jan 7, 5:24 am, Ravi Sharma <ping2r...@gmail.com> wrote:
>> > Hi,
>> > I have a entity like this
>> > Class AdPost{
>> > ...few property
>> > Set<Key> locations;
>> > Set<Key> categories;
>> >
>> > }
>> >
>> > when i am running a query like
>> > select AdPost where locations = oneLocation && categories == oneCategory
>> > (pseudo code)
>> > where oneLocation is one valid key of a location and oneCategory is a
>> valid
>> > key of one category.
>> >
>> > After running this i expect to get list of AdPost but it returns me
>> null
>> > and no error.
>> > Is it allowed to run euqality on two collection property in same query?
>> >
>> > Thanks,
>> > Ravi
>>
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