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
---
Rainer Schweigkoffer SAP AG Walldorf
Business Solution & Technology TD Core JS&I
Technology Development Dietmar-Hopp-Allee 16
Java Server Core D-69190 Walldorf
JEE Implementation Group phone: +49 6227 7 45305
Building 3, I.3.14 fax: +49 6227 7 821177
rainer.schweigkoffer_at_sap.com
Sitz der Gesellschaft/Registered Office: Walldorf, Germany
Vorstand/SAP Executive Board: Werner Brandt, Angelika Dammann,
Bill McDermott (Co-CEO), Gerhard Oswald, Vishal Sikka,
Jim Hagemann Snabe (Co-CEO)
Vorsitzender des Aufsichtsrats/Chairperson of the SAP Supervisory
Board: Hasso Plattner
Registergericht/Commercial Register Mannheim No HRB 350269
Diese E-Mail kann Betriebs- oder Geschaeftsgeheimnisse oder sonstige
vertrauliche Informationen enthalten. Sollten Sie diese E-Mail
irrtuemlich erhalten haben, ist Ihnen eine Verwertung des Inhalts,
eine Vervielfaeltigung oder Weitergabe der E-Mail ausdruecklich
untersagt. Bitte benachrichtigen Sie uns und vernichten Sie die
empfangene E-Mail. Vielen Dank.
This e-mail may contain trade secrets or privileged, undisclosed, or
otherwise confidential information. If you have received this e-mail
in error, you are hereby notified that any review, copying, or
distribution of it is strictly prohibited. Please inform us
immediately and destroy the original transmittal. Thank you for your
cooperation.