OpenJPA should be able to fetch the value for the auto-assigned field after
commit like any other field.
The following simple test demonstrates when an auto-assigned value is set on
the persistent entity when
a corresponding field is declared as
@Column(name="ts", columnDefinition="TIMESTAMP DEFAULT
CURRENT_TIMESTAMP")
private Timestamp ts;
/**
* When does the value of an auto-assigned field gets set on the entity?
*/
public void testAutoAssignedFieldValue() {
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
AutoInc pc = new AutoInc();
assertNull(pc.getTimestamp());
em.persist(pc);
assertNull(pc.getTimestamp());
em.flush();
assertNull(pc.getTimestamp());
em.getTransaction().commit();
assertNull(pc.getTimestamp());
em.clear();
assertNull(pc.getTimestamp());
em.getTransaction().begin();
pc = em.find(AutoInc.class, pc.getId());
assertNotNull(pc);
assertNotNull(pc.getTimestamp());
}
Marcel Ruff wrote:
>
> Hi,
>
> i was to quickly happy:
>
> The timestamp is add nicely to the DB: OK
> (check with normal sql)
>
> But when i want to load it later into my bean
> it remains null in java:
> CompanyProperty cp = em.find(CompanyProperty.class, key);
> log.info(cp.getCreationTs());
> --> is null!
>
> Why this?
>
> Thanks
> Marcel
>
> Marcel Ruff wrote:
>> Pinaki Poddar wrote:
>>> Hi,
>>> With MySQL this is what happens:
>>>
>>>
>>> 1. Definition of a column with default timestamp value
>>>
>>> @Column(name="ts", columnDefinition="TIMESTAMP DEFAULT
>>> CURRENT_TIMESTAMP")
>>> private Timestamp ts;
>>>
>>> 2. OpenJPA issues SQL to create the table:
>>>
>>> CREATE TABLE AutoInc (id BIGINT NOT NULL, ts TIMESTAMP DEFAULT
>>> CURRENT_TIMESTAMP, PRIMARY KEY (id))
>>>
>>> 3. OpenJPA issues SQL for insert when application does not set the
>>> value of
>>> ts field:
>>> INSERT INTO AutoInc (id, ts) VALUES (?, ?) [params=(long)
>>> 100, (null)
>>> null]
>>>
>>>
>>> 4. This is what database looks like:
>>>
>>> mysql> select * from autoinc;
>>> +-----+---------------------+
>>> | id | ts |
>>> +-----+---------------------+
>>> | 100 | 2008-08-06 12:47:29 |
>>> +-----+---------------------+
>>>
>> Hi all,
>>
>> thanks for all support & solution.
>>
>> For postgres 8.3.x this works well:
>>
>> @Column(name = "creationts", insertable=false, updatable=false,
>> columnDefinition="timestamp not null default current_timestamp")
>>
>>
>> regards
>> Marcel
>>
>>
>
>
> --
> Marcel Ruff
> http://www.xmlBlaster.org
> http://watchee.net
> Phone: +49 7551 309371
>
>
>
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