如果没有像Spring这样的容器(或诸如基于Spring的Unitils之类的容器),则必须手动注入实体管理器。在这种情况下,您可以 将以下内容用作基类:
public abstract class JpaBaseRolledBackTestCase {
protected static EntityManagerFactory emf;
protected EntityManager em;
@BeforeClass
public static void createEntityManagerFactory() {
emf = Persistence.createEntityManagerFactory("PetstorePu");
}
@AfterClass
public static void closeEntityManagerFactory() {
emf.close();
}
@Before
public void beginTransaction() {
em = emf.createEntityManager();
em.getTransaction().begin();
}
@After
public void rollbackTransaction() {
if (em.getTransaction().isActive()) {
em.getTransaction().rollback();
}
if (em.isopen()) {
em.close();
}
}
}