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Publius
 Post subject: GenerationType.AUTO
PostPosted: Fri Dec 01, 2006 4:36 pm 
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Joined: Wed Oct 13, 2004 10:21 am
Posts: 4
According to the EJB3.0 spec, the @GeneratedValue annotation's 'generator' property defaults to the "Default id generator supplied
by persistence provider."

I'm using strategy=GenerationType.AUTO, and I've read in the forums that for when GenerationType.AUTO is used with Oracle a sequence will be used as the generator. what will the default sequence name be? Is it *table_name*_seq?
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Kintar1900
 Post subject:
PostPosted: Fri Dec 01, 2006 5:33 pm 
Newbie

Joined: Fri Dec 01, 2006 2:12 pm
Posts: 5
I ran across this earlier today, actually. The default sequence name is hibernate_sequence. Not terribly useful, if you ask me. :)

You can specify a sequence name at the class level with:
Code:
@SequenceGenerator(sequenceName = "mySequence", name = "id_gen")


Then, you can reference that generator in your GeneratedValue annotation like:
Code:
@GeneratedValue(strategy = GenerationType.SEQUENCE, name = "id_gen")


Hope that helps!

-- Alec
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Kintar1900
 Post subject:
PostPosted: Fri Dec 01, 2006 5:36 pm 
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Joined: Fri Dec 01, 2006 2:12 pm
Posts: 5
Oh, one more thing. For some reason, the default allocationSize attribute on @SequenceGenerator is 50, which causes the numbers being pulled from your sequence to be multiplied by 50. (Can anyone tell me why you'd EVER want to do that?) Just set allocationSize = 1 to get the raw sequence number.

Code:
@SequenceGenerator(name = "id_gen", sequenceName = "mySequence", allocationSize = 1)
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Publius
 Post subject:
PostPosted: Mon Dec 04, 2006 11:42 am 
Newbie

Joined: Wed Oct 13, 2004 10:21 am
Posts: 4
Wow. So by default, All tables' IDs are generated from one sequence? Now that's a unique identifier. Thanks for the help.
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