Custom UserType for Entity?

vanyatka · **Posted:** Fri Dec 22, 2006 6:36 am

Hi all,

I'd like to implement custom usertype for one of my entities. The question is, how to describe and handle the identity of the objects? I would really like Hibernate to generate the identites, like it does with @Id @GeneratedValue tags, but apparently this cannot be combined with custom usertypes, or can it?

All examples I have found so far use custom usertypes for "value" properties, which are mapped to one or several columns without dealing with any idenitity information whatsoever.

Can anyone confirm that while implementing custom types for entities I have to manage object Id manually and then handle Id property like any others in the custom type class?

Thank you,

max · **Posted:** Fri Dec 22, 2006 8:52 am

the type of an object is not related to the identiy generation (except some identifier generators assumes a numerical/integer type)

vanyatka · **Posted:** Fri Dec 22, 2006 6:48 pm

Thanks for the answer, this is really a good news. But what I'm still unable to find is how to specify the type of my entity.

Code:

@org.hibernate.annotations.Type

is not applicable to classes.

I'd like to save the object as stand-alone, without referencing. Can I specify the custom type of the entity with annotations?

max · **Posted:** Fri Dec 22, 2006 6:53 pm

why do you talk about the class here ? it is somehting related to the id property.

vanyatka · **Posted:** Fri Dec 22, 2006 7:37 pm

Quote:

why do you talk about the class here ?

Because I'm trying to describe Entity, represented by a class. And also because I'm not too good at Hibernate, apparently :)

Quote:

it is somehting related to the id property.

Do you mean that I should specify usertype to Entity's Id property, like following?

Code:

@Entity
public class TransactionException extends RuntimeException {

    @org.hibernate.annotations.Type(
            type = "usertype.TransactionExceptionUserType"
    )
    @org.hibernate.annotations.Columns(columns = {
        @Column(name="exception"),
        @Column(name="stack")
            })

    @Id
    @GeneratedValue
    private Long id;

    ....
}

max · **Posted:** Sat Dec 23, 2006 5:03 am

ehh....i think we are talking pass eachother ;)

UserType is for values not entities.

Why do you want a usertype for entities anyway ?

vanyatka · **Posted:** Sat Dec 23, 2006 10:42 am

max wrote:

UserType is for values not entities.
Why do you want a usertype for entities anyway ?

Good question, now I realise I can do without it. In fact it is even better in a way to have an entity, and custom types only for it's property values. That way other standard properties may be mapped independently.

Thanks for the hint :)