CODEWITHSUNDEEP
hibernate
naiad09
naiad09

Reputation: 117

Dirty check in Hibernate

As is known, Hibernate uses dirty check - that is, in DB it changes only fields that have changed in the entity of the program. How to know which fields have changed? Can I get old values?

Upvotes: 0

Views: 888

Answers (1)

Naros
Naros

Reputation: 21113

There are a series of event listener SPIs in org.hibernate.event.spi that you can implement and register during the construction of a SessionFactory where you can obtain the state information your asking about. For example:

public class MyPreUpdateEventListener implements PreUpdateEventListener {
  @Override
  public boolean onPreUpdate(PreUpdateEvent event) {
    Object[] newState = event.getState();
    Object[] oldState = event.getOldState();
    /* from this point, you'd need to determine the differences yourself */
  }
}

Upvotes: 1

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