JPA PrePersist和更新前

我使用的是基礎機構：JPA PrePersist和更新前

@MappedSuperclass 
public class BaseEntity { 
    private static final Logger L = LoggerFactory.getLogger(BaseEntity.class); 

    String id; 
    String name; 
    String description; 

    Date created; 
    Date updated; 

    public BaseEntity() { 
     id = UUID.randomUUID().toString(); 
    } 

    @PrePersist 
    protected void onCreate() { 
     created = new Date(); 
    } 

    @PreUpdate 
    protected void onUpdate() { 
     updated = new Date(); 
    } 

    @Id 
    @Column(name = "id", nullable = false) 
    public String getId() { 
     return id; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

    @Temporal(TemporalType.TIMESTAMP) 
    public Date getCreated() { 
     return created; 
    } 

    public void setCreated(Date created) { 
     this.created = created; 
    } 

    @Temporal(TemporalType.TIMESTAMP) 
    public Date getUpdated() { 
     return updated; 
    } 

    public void setUpdated(Date updated) { 
     this.updated = updated; 
    } 
    ... snip

然後，我有一個實體：

@Entity 
@JsonIdentityInfo(generator = ObjectIdGenerators.UUIDGenerator.class, property = "@baby_id", scope = Baby.class) 
@Table(name="babies") 
public class Baby extends BaseEntity { 
    private static final Logger L = LoggerFactory.getLogger(Baby.class); 

    Date dob; 

    public Baby() { 
     super(); 
    } 

    public Date getDob() { 
     return dob; 
    } 

    public void setDob(Date dob) { 
     this.dob = dob; 
    } 
    ... snip ...

這裏是我的測試：

@Test 
@Transactional 
public void testCreateBaby() { 
    Baby b = new Baby(); 
    b.setName("n"); 
    b.setDescription("baby"); 
    b.setDob(new Date()); 

    assertNull(b.getCreated()); 
    assertNull(b.getUpdated()); 
    em.persist(b); 
    assertNotNull(b); 
    assertNotNull(b.getCreated()); 
    assertNull(b.getUpdated()); 

    b.setName("n3"); 
    b = em.merge(b); 
    em.persist(b); 
    assertNotNull(b.getUpdated()); 
}

測試失敗因爲updated字段沒有設置。我該怎麼做呢？這是Hibernate JPA，用於測試的是arquillian和wildfly。

來源

2016-05-20 mikeb

嘗試強制刷新。可能是直到刷新之前才執行回調。 –

[@PreUpdate和@Prepersist在hibernate/JPA（使用會話）中可能有重複]（http://stackoverflow.com/questions/4133287/preupdate-and-prepersist-in-hibernate-jpa-using-session） – sauumum

請請參閱http://forum.spring.io/forum/spring-projects/data/46235-hibernate-3-2-persistent-lifecycle-annotations-notwork，如果它有幫助 – sauumum

正如Alan Hay所說，em.flush()就在堅持工作之前，在這種情況下工作得很好。這不是建議的問題的重複，因爲沖洗的作品。

來源

2016-05-20 18:58:59 mikeb

JPA PrePersist和更新前

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