Advanced Topics

Interceptors and Listeners

public class AuditInterceptor extends EmptyInterceptor {
    @Override
    public boolean onSave(Object entity, Serializable id,
                         Object[] state, String[] propertyNames,
                         Type[] types) {
        if (entity instanceof Auditable) {
            for (int i = 0; i < propertyNames.length; i++) {
                if ("createdDate".equals(propertyNames[i])) {
                    state[i] = new Date();
                    return true;
                }
            }
        }
        return false;
    }
}

// Usage
Session session = sessionFactory.withOptions()
    .interceptor(new AuditInterceptor())
    .openSession();

Custom Types

public class PhoneNumberType implements UserType {
    // Implement type conversion methods
}

@Entity
public class Contact {
    @Type(type = "com.example.PhoneNumberType")
    private PhoneNumber phoneNumber;
}

Stored Procedures

Query query = session.createStoredProcedureQuery("get_user_by_email")
    .registerStoredProcedureParameter("email_param", String.class, ParameterMode.IN)
    .setParameter("email_param", "john@example.com");

List<Object[]> results = query.getResultList();