JPA标准Updatequery没有真正更新任何东西

我不可能有真正发生的更新 Updatequery

@Entity
@ToString(callSuper = true)
// query just for logging purposes
@NamedQuery(name="TestEntity.findAll", query="SELECT t FROM TestEntity t")
public class TestEntity {
    @Id
    @GeneratedValue
    private Long id;    
    private String message = "not altered";
}    

还有一个测试,比如:

@Slf4j
@DataJpaTest
@org.springframework.transaction.annotation.Transactional(propagation =
                                Propagation.NOT_SUPPORTED)
@RunWith(SpringRunner.class)
public class TestEntityUpdateTest {

    @PersistenceContext
    private EntityManager em;

    private void buildTestEntity(int i) {
        em.persist(new TestEntity());
    }

    private void log(Object o) {
        log.info("\n{}", o);
    }

    @Test
    @Transactional
    public void testUpdate() {
        IntStream.range(1, 4).forEach(this::buildTestEntity);
        TypedQuery<TestEntity> tq =
                em.createNamedQuery("TestEntity.findAll", TestEntity.class);

        // log inserted stuff
        log.info("\nINSERTED rows");
        tq.getResultList().forEach(this::log);

        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaUpdate<TestEntity> update =
                    cb.createCriteriaUpdate(TestEntity.class);
        Root<TestEntity> from = update.from(TestEntity.class);
        update.set(from.get("message"), "ALTERED TEXT!");
        int i = em.createQuery(update).executeUpdate();

        log.info("\nUPDATED {} rows", i);
        // log updated stuff
        tq.getResultList().forEach(this::log);
    }

}

一定很简单,但我看不出来是什么?我也试过了 em.flush() 在任何可以想象的地方。

要加点吗 commit() 或者某个Spring数据设置?

行插入正确。我可以看到相应的日志行,例如:

TestEntity(super=org.example.spring.entity.updatequery。TestEntity@230a73f2,

我可以看到更新查询和绑定正确(?):

更新
测试实体
设置

....

更新后,我看不到更改,但:

TestEntity(super=org.example.spring.entity.updatequery。TestEntity@230a73f2,

相关部件 pom.xml (要求更多):

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
</parent>
...
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>

    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>test</scope>
    </dependency>
...