Actually, SDO object is a common but special DTO object.
A DTO object normally has some structure; otherwise how do users know what
to get from it ? :)
It has some dynamic feature similiar to XML, what's more, it has
no
static setter/getter method, so hibernate won't recognize it as a
JavaBean object
dynamic-map mode in hibernate is good, but not enough, I'm not sure
whether it can support inheritance and relationship as good as POJO.
the lack of setter/getters is not a problem since we have both Tuplizer
and PropertyAccessors to deal with this.
And the dynamic part is probably not something you want to reflect down to
the persistence layer/db since then
you would end up having a schema layout of two tables Entities and
Attributes which is rarely usefull.
I'm not up to speed with how a SDO actually looks like. Is it something
like:
class Employee extends SDOObject {
public String getName() {
return getAttribute("name").asString();
}
public int getAge() {
return getAttribute("age").asInt();
}
public Set getFriends() ..
}
or
SDOObject employee = new SDOObject("Employee);
employee.setAttribute("name", "Ed");
employee.setAttribute("age", 12);
employee.setCollection("friends", <set of other SDO's>)
?
The first one should be trivial to do
The second one is harder since it requires you to be explicit about what
"type" the actual instance is.
/max
----- Original Message -----
From: "Max Rydahl Andersen" <max.andersen(a)jboss.com>
To: "Eta Huang" <huangkai(a)primeton.com>
Sent: Wednesday, October 11, 2006 4:48 PM
Subject: Re: [hibernate-dev] What is the easiest and safest way to
customize Hiberate for other entity mode?
> On Wed, 11 Oct 2006 04:10:56 +0200, Eta Huang <huangkai(a)primeton.com>
> wrote:
>
>> Hi all:
>> I'm developing SDO(Service Data Object) implementation, and when I
>> wanna persist them Hibernate is the first one came to my mind. I tried
>> it's dynamic-map mode, but that's not what i expected, I want to
>> customize Hibernate to make it full SDO support. For the sake of
>> safety,
>> the minimal classes needed to be overrided or changed, the better.
>> Any hibernate guru can show me the right way? very thankful!
>
> What are the problems you are forseeing with SDO's ?
>
> Could you sum up the differences there are between a JavaBean and SDO ?
>
> Is SDO's completely dynamic and has no fixed structure ?
>
> --
> --
> Max Rydahl Andersen
> callto://max.rydahl.andersen
>
> Hibernate
> max(a)hibernate.org
>
http://hibernate.org
>
> JBoss a division of Red Hat
> max.andersen(a)jboss.com
>
--
--
Max Rydahl Andersen
callto://max.rydahl.andersen
Hibernate
max(a)hibernate.org
http://hibernate.org
JBoss a division of Red Hat
max.andersen(a)jboss.com