Hi Linda, hi Mike,
is there any update on more support for embeddeds in EJBQL (in addition
to navigating through embeddeds)?
Thanks!
Regards Michael
>
> I don't recall discussion of direct comparison of embeddeds.
> Otherwise we also would have needed to have added
> rules for such comparisons (e.g., in the presence of
> serialized fields, nulls, etc. as well).
>
> Comparison of embeddeds would be useful, but we don't
> otherwise provide first-class support for embeddeds in
> the query language, so we should look at the other cases
> if we open this discussion. For example, right now we don't
> cover support for embeddeds in select lists, COUNT, GROUP BY,
> UPDATE, etc.
>
> I think it would be good to do this. (and I think it
> would be better than just restricting to comparisons).
> From a BNF point of view, I believe it would also be
> the simplest thing to do.
>
> Michael, Shelly what would the impact be (assuming you
> don't cover this already ??)?
>
> thanks,
>
> Linda
>
>
> Mike Keith wrote:
>
>> Hi,
>>
>> Yes, we did intend to allow comparison of embedded objects as outlined
>> in 4.4.4, but the grammar does not seem to have been updated to
>> reflect it. We will either have to modify the grammar or change 4.4.4
>> to back out of the embedded object comparison support.
>>
>> Depending on how messy it makes the EJB QL grammar we may choose to pull
>> back the embedded comparison from EJB QL since there is always a
>> workaround of navigating through the embedded object to the embedded
>> state fields. (Linda, we might want to check with the group on this
>> question, though.)
>>
>> -Mike
>>
>>
>>> -----Original Message-----
>>> From: Linda DeMichiel [mailto:Linda.Demichiel_at_Sun.COM]
>>> Sent: Tuesday, January 03, 2006 10:48 AM
>>> To: Michael Bouschen
>>> Cc: Mike Keith; persistence_at_glassfish.dev.java.net
>>> Subject: Re: EJBQL: question about state fields of an embedded class
>>> type
>>>
>>>
>>> Michael,
>>>
>>> Happy new year!
>>>
>>> Michael, Your understanding of how it is defined
>>> is correct.
>>>
>>> Mike, what do you think -- should we extend this
>>> to support direct comparison of embedded objects,
>>> or hold off?
>>>
>>> Linda
>>>
>>>
>>> Michael Bouschen wrote:
>>>
>>>
>>>> Hi Linda, hi Mike,
>>>>
>>>> Happy New Year!
>>>>
>>>> I have a question about embedded objects in EJBQL: does EJBQL allow
>>>> comparing of embedded objects? Suppose class Customer has a property
>>>> embeddedCountry annotated as @Embedded of @Embeddable type
>>>> EmbeddedCountry. The following EJBQL query compare the
>>>
>>>
>>> property with a
>>>
>>>> parameter:
>>>> SELECT c FROM Customer c WHERE c.embeddedCountry = :param
>>>>
>>>> I read chapter 4.4.4 Path Expressions that I can navigate through an
>>>> embedded object. But a path expression must end in a simple
>>>
>>>
>>> state-field
>>>
>>>> which cannot refer an embedded object. Is this correct?
>>>
>>>
>>> Then the above
>>>
>>>> query would not be valid.
>>>>
>>>> Regards Michael
>>>
>>>
>>