The correct mapping depends on whether you want the relationship to be
unidirectional or bidirectional. The mapping you have is correct for a
bidirectional relationship, you just need to point the mappedBy attribute to
the name of the field in the Image class that holds the Category (note that
the field in the Category class must be annotated with @ManyToOne). For more
details have a look at:
http://www.hibernate.org/hib_docs/annotations/reference/en/html/entity.html#entity-mapping-association-collections
starting at section 2.2.5.3.2.
In most cases you do not need a join table. It is only recommended if you
make the relationship unidirectional, and even then is not required.
Mike.
On 5/1/07, sionsmith <[EMAIL PROTECTED]> wrote:
Hey everyone - i have a simple persistence mapping question which i am
unsure
about:
I have a Category class which can many images - an image can only be in
one
category. How do i map this? I've had a go but not sure if i'm correct:
===== Category.class ======
@Entity
@Table(name="categories")
public class Category extends BaseObject {
protected Set<Image> images = new HashSet<Image>();
//getter
@OneToMany(
targetEntity=Image.class,
mappedBy="???"
)
public Set<Image> getImages(){
return images;
}
}
===== Image.class =====
public class Image extends BaseObject {
protected Long categoryId;
//getter
public Long getCategoryId() {
return categoryId;
}
}
Thats as far as i have got? Do i need a join table? Surely if the Image
object just contains a category ID that will be fine? Any suggestions
about
how to map this would be very greatful :)
Many Thanks Sion
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