Hi, I use the merge because the object is modified while detached (client <=> server/ejb).
-----Ursprüngliche Nachricht----- Von: Norbert Rieger [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 13. November 2008 14:38 An: [email protected] Betreff: Setting NULL value on OneToOne mapping Hi, how do I "reset" (set foreign key field to NULL) a assocation in a OneToOne relationship ? I tried to set it to "null" and then execute merge, but the UPDATE command does not include this. e.g. // ---------------------------- @Entity class M { @Id long id ; .... } // ---------------------------- @Entity class P { @Id long id ; int x; int y; @OneToOne // optional should be true by default M myM ; public void setMyM (M theM) { myM = theM ; } } .... P p = em.find (....) p.setX (); p.setY (); // release association p.setMyM ((M)null) ; em.merge(p) ; X,Y are updated, but field P.M_ID (foreign key field P=>M) stays unchanged. How to do this, merge oder by an update command ? Thanks a lot in advance NR
