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 Post subject: Question about entities and values
PostPosted: Sat Oct 25, 2003 12:06 am 
Newbie

Joined: Sun Oct 12, 2003 6:33 pm
Posts: 7
Hi,

This is from the Hibernate documentation:

Quote:
Values have no independent identity, so they cannot be shared by two entities or collections


Does this really mean that, if I want to persist a copy of an object, say of class Foo:

Code:
public class Foo
{
    private String bar;

    public String getBar()
    {
         return bar;
    }

    public void setBar( String bar )
    {
         this.bar = bar;
    }
}


Then I have to do something like this:

Code:
// Suppose "foo" is some Foo object persisted before.

Foo newFoo = new Foo();
newFoo.setBar( new String( foo.getBar() ) );
session.save( newFoo );


while calling
Code:
newFoo.setBar( foo.getBar() )
would be incorrect because the bar reference would be shared by foo and newFoo?

Thank you folks!


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 Post subject:
PostPosted: Sat Oct 25, 2003 1:43 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
No. It means only that the reference equality will be lost when you reload the objects.

(Though what you have written is true in the special case of collections.)


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