Hi Gilberto,
There's no automated way port a Hibernate project to Cayenne, but you
can certainly do that manually. I would suggest to use Cayenne
traditional non-POJO API (while POJO/JPA stuff is still pre-alpha,
Cayenne API is production quality and has fewer surprises).
The quickest way to do that is probably the following:
* reverse engineer the DB in question with CayenneModeler
* manually tweak the model to match the property names in the
existing POJO Java classes
* Run class generator to generate the _Xyz superclasses.
* Change the existing classes by hand to inherit from _Xyz counterpart.
* Remove existing persistence fields, and use superclass getters and
setters to access them.
* Change the API throughout the code to use Cayenne ObjectContext and
Queries.
Andrus
On Oct 24, 2007, at 10:17 PM, Gilberto C Andrade wrote:
[This is second email I send, I think the first one get lost]
Hi all,
I've been searching on docs/maillist about how to persist an already
existent pojo, but have no luck. Let me explain: we have two old
projects build with hibernate 2.1.8 and all model are marked with
hibernate tag on doc area in java source [1].
But now we want to use those models with cayenne (3.0M1) without edit
them. Is that possible?
These systems included the business and data access in the same place.
So turning it impossible to change the domain logic. By the way,
someone
can suggest a good design separation of package?
We are now trying this:
br.to.gov.secad.<module>.model;
br.to.gov.secad.<module>.dao;
br.to.gov.secad.<module>.service;
Thanks!
Gilberto
PS.: I think we won the battle about ORM choice. Now comes the new
one:
beat the eclipse hibernate tools! Thanks all for help!
[1]
[code]
/**
* Área de atuação do curso: informática, RH, financeira, etc.
* @hibernate.class table="scc.scc_area"
*/
public class Area implements Serializable {
/** identifier field */
private Integer cdArea;
/** persistent field */
private String dcArea;
/** full constructor */
public Area(Integer cdArea, String dcArea) {
this.cdArea = cdArea;
this.dcArea = dcArea;
}
/** default constructor */
public Area() {
}
/**
* @hibernate.id generator-class="sequence" column="cdarea"
unsaved-value = "null"
* @hibernate.generator-param name = "sequence" value =
"scc.scc_area_sequence"
* @return Integer
*/
public Integer getCdArea() {
return this.cdArea;
}
public void setCdArea(Integer cdarea) {
this.cdArea = cdarea;
}
/**
* @hibernate.property column="dcarea" length="40" not-
null="true"
*
*/
public String getDcArea() {
return this.dcArea;
}
[/code]
