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Primary Key Problem: Setting id manually and by sequence

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caron.hatschek

Post subject: Primary Key Problem: Setting id manually and by sequence

Posted: Fri Jul 15, 2011 5:17 am

Newbie

Joined: Fri Jul 15, 2011 5:01 am
Posts: 1

Hello,

I am using a sequence to generate primary keys.

Code:

@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "serial_room_id")
@SequenceGenerator(name = "serial_room_id", sequenceName = "serial_room_id", allocationSize = 1)
private Long id;

For migration purpose I need to set the primary key manually but not in normal mode.
I get an exception when I try this:

Code:

Room room = new Room();
room.setId(4711);
...
roomDAO.saveModel(room);

Exception:
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: org.fhws.lantel.model.Room
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1214)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1147)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1153)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:678)

Is it possible to use both approaches coexistently? How?

Thanks in advance,
Ron

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