Extra update when adding item to collection issue

teknokrat · **Joined:** Thu Aug 28, 2003 10:54 am **Posts:** 67

I have a parent-child relationship similar to the one in Chapter 9 of the docs except my collection belongs to a component of the parent. The relation is bidirectional and mapped with inverse=false. When I do the following

Code:

//parent loaded in another session
Child child = new Child();
child.setParent(parent);
parent.getComponent().getChildren().add(child)
parent.setModified(new Date());
session.update(parent);

I get the following SQL generated

1. Insert of child into database. Good, just what I wanted.
2. Update of parent. Fine, due to setModified();
3. Update of another child in the collection that has not had anything modifed. The child being updated changes as i add more children to the collection but it is always one update and not several.

I cannot explain 3. As far as i can tell there are no side effects to any of the above calls that could cause this. i have checked all the values before and after the update and they are the same.

I am using latest hibernate version with postgresql.

thank you

emmanuel · **Posted:** Wed Mar 10, 2004 5:32 pm

http://www.hibernate.org/155.html

emmanuel · **Posted:** Wed Mar 10, 2004 5:33 pm

And check you equals/hashCode implementation for the no-related-child-updated issue

teknokrat · **Joined:** Thu Aug 28, 2003 10:54 am **Posts:** 67

but, but , but... My set is mapped with inverse=true also lazy=true and cascade=all. The associaltion is bidirectional, I don't need it to be in the object model nut the parent_id field is not-null so as I understand things I must have the bidirectionality.

As for hashCode and equals. All my entities extend a base class DomainObject which defines the following methods

Code:

   public boolean equals(Object o) {
      if (this == o)
         return true;
      if (!(o instanceof DomainObject))
         return false;
      DomainObject d = (DomainObject) o;
      return (version == d.getVersion()) && equals(d);
   }

   private boolean equals(DomainObject d) {
      return id == null ? false : id.equals(d.getId());
   }

   public int hashCode() {
      return (id == null) ? 0 : id.hashCode();
   }

BTW, I get the same behaviour wether I have inverse=true or not.

emmanuel · **Posted:** Fri Mar 12, 2004 2:15 pm

Does id unique in you whole domain model ?