Java 类javax.persistence.PersistenceUtil 实例源码

@Test
public void shouldRetrieveRef(){

    Person p =  em.getReference(Person.class, 1l);
    p.setLastName("ronak");

  Assertions.assertThat(p.getClass()).isNotInstanceOf(Person.class);
   Assertions.assertThat(p.getId()).isEqualTo(1l);
   PersistenceUtil persistenceUtil = Persistence.getPersistenceUtil();
   log.info("{}",persistenceUtil.isLoaded(p));

}

@Test
public void shouldRetrieveFind(){
   Person p =  em.find(Person.class, 1l);
   p.setLastName("ronak");
  Assertions.assertThat(p.getClass()).isNotInstanceOf(Person.class);
   Assertions.assertThat(p.getId()).isEqualTo(1l);
   PersistenceUtil persistenceUtil = Persistence.getPersistenceUtil();
   log.info("{}",persistenceUtil.isLoaded(p));
}

public List<School> findall () {
    System.out.println("loading schools from table SCHOOL");
    List <School> schools = (List<School>) em.createQuery("select s from School s").getResultList();
    PersistenceUtil util = Persistence.getPersistenceUtil();

    boolean isObjectLoaded = util.isLoaded(schools.get(0));
    boolean isManaged = em.contains(schools.get(0));

    //force lazy loading befor the end of the session
    schools.get(0).getAcademicYears().get(0).getYear();

    return schools;
}

public static PersistenceUtil getPersistenceUtil() {
    return Persistence.getPersistenceUtil();
}

public PersistenceUtil util()
{
    return Persistence.getPersistenceUtil();
}