how to get previouseState without fetching from the db using hibernate interceptor to create audit trail table?

Question

I am trying to create an Audit table that will ends looking something like that :

entity,id,property,oldValue,newValue,user,timestamp

Answer 1

An alternative approach is to store the previous state on load.

@Entity
@Table(name='Foo')
class Foo {

    @Transient
    private Foo previousState;

    @PostLoad
    private void setPreviousState(){
        previousState = new Foo();
        //copy the fields
    }

    public Foo getPreviousState(){
        return previousState;
    }

}