[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-749) Generated Annotation can not generate Date automatically

[Jim Cushing (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30754 ] 

Jim Cushing commented on ANN-749:
---------------------------------

You're misunderstanding what @Generated means. This indicates the value is generated by the database. When you include this annotation, Hibernate will select the value from the database after an insert and/or update (depending on your GenerationTime), such that the in-memory entity has the proper value.

For example, used use @Generated if your database supports an auto-increment/identity column for primary keys, or if you've got a value that's updated via a trigger.

> Generated Annotation can not generate Date automatically
> --------------------------------------------------------
>
>                 Key: ANN-749
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-749
>             Project: Hibernate Annotations
>          Issue Type: Bug
>    Affects Versions: 3.3.1.GA, 3.4.0.CR1
>         Environment: OS: Windows XP
> DB: HSQL
>            Reporter: yuanqingfei
>
> 	@Before
> 	public void setup() {
> 		order = new Order();
> 		// enter all required fields
> 		order.setName("order1");
> 		order = orderDAO.save(order); //Hibernate should generate a timestamp here
> 	}
> 	@Test
> 	public void testSave() {
> 		assertTrue(orderDAO.exists(order.getId()));
> 		System.out.println(order.getCreateTime()); //here should get a date.
> 	}
> Annotation part in Order:
> 	@Temporal(TemporalType.TIMESTAMP)
> 	@Column(insertable = false,updatable=false)
> 	@org.hibernate.annotations.Generated(org.hibernate.annotations.GenerationTime.INSERT)
> 	private Date createTime;
> Save part in OrderDAO.
> 	@SuppressWarnings("unchecked")
> 	public T save(T object) {
> 		return (T) super.getHibernateTemplate().merge(object);
> 	}
> every time, I just only get null.

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