Rainer, thanks for weighing in on this issue.
Do any of the rest of you have an opinion on this item? I'd like
to add a clarification one way or the other (as suggested below).
thanks,
-Linda
On 9/5/2011 8:20 AM, Rainer Kwesi Schweigkoffer wrote:
> Hi Emmanuel, all,
>
> Emmanuel Bernard, am 2 Sep 2011 hast Du um 10:51 zum Thema "[jsr338-experts] @OneToOne(optional=true) and @Pr" geschrieben :
>
>> @Entity
>> class User {
>> @Id String username;
>>
>> @OneToOne(optional=true) @PrimaryKeyJoinColumn
>> Profile getProfile() { ... };
>> }
>
>> But elsewhere the spec mention the need to have foreign keys (in general).
>
> I'd favour to explicitly state that in the above case that no foreign
> key is created, but could also live with a statement that the
> combination of optional=true and @PrimaryKeyJoinColumn is not portably
> supported.
>
> In the derived entity case the relationship becomes part of the id and,
> hence, to my understanding may not be null.
>
> With respect to
> http://lists.jboss.org/pipermail/hibernate-dev/2011-August/006980.html
> I have not fully understood the distinction between generated and user-
> defined ids. Why would the fact that a user id was generated require
> the user to have a profile ?
>
> Kind regards
> Rainer
>
>
>
>
> ---
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