On Thu, Aug 13, 2009 at 1:10 PM, crispyoz (via Nabble) < ml-user+243560-833017...@n2.nabble.com<ml-user%2b243560-833017...@n2.nabble.com> > wrote:
> I didn't quite get what you were trying to describe Let me try again. I have multiple mappings for the same column. Of those multiple mappings, only one may be mutable. So E2 has a @Basic *mutable* mapping for its "x" column and its "x" field--you can set the "x" field as many times as you like to whatever value you like (but read on). At insert or update time, your changes will be persisted. Although I don't explicitly specify it, it is insertable = true and updatable = true. Then E2 has a lazy @ManyToOne mapping for its "e1" *field* whose @JoinColumn is an *immutable* mapping to the "x" column. That is, you could, I suppose, set the e1 field to an E1 of your choice, if you wanted, but since that mapping is marked as "insertable = false, updatable = false", the E1 you install in this manner will be ignored at insert and at update time. So if you stuck an E1 in there, then saved the E2, your E1 would not be persisted. It should follow from this--at least according to my reading--that I should be able to set the "x" field to a value that is the primary key of an E1, and set the "e1" field to null. So let's say I set e2.x to 5, and let's say that there's an E1 in the database with a PK of 5. It should be the case that if I merge e2, I should now be able to say e2.getE1(), and I should get back an E1 as computed by the JPA relationship machinery. So, in other words, it should be possible to create an E2 with, say, a value for its "x" field of 5, and then, after a merge and perhaps a flush, you SHOULD be able to say to that E2, "OK, give me your related E1, even though I never specified it", and because you've supplied the raw materials for the mapping, it should be able to lazily give you that E1 reference. But I am not seeing this behavior. I am unclear as to whether it is a bug or a part of the specification that I am reading badly (it sure wouldn't be the first time :-\). Thanks, Laird -- View this message in context: http://n2.nabble.com/insertable-updatable-%3D-false-question-tp3439111p3439449.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
