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Re: [eclipselink-users] Eclipselink retrieves old data, but data is already updated in the database. Where does it get the old data from?
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Dear Tom,
this seems to work. Great. Thanks!
Raven
On Fri, Apr 23, 2010 at 2:49 PM, Tom Ware <tom.ware@xxxxxxxxxx> wrote:
> EclipseLink has a 2nd level cache. Is it possible the objects you are
> reading are already in that cache?
>
> Try adding the query hint, eclipselink.refresh=true to your query:
>
> q1.setHint(eclipselink.refresh, true);
>
> -Tom
>
> Raven McSmith wrote:
>>
>> Hi,
>>
>> in my project I have to Eclipse RCP plugins. Both are configured to
>> use Eclipselink on one and the same database. Both get the same
>> credentials.
>> If the first plugin, showing some views to add data to the database,
>> is started it shows the data from the database and the operation
>> directly write to the database and I can see, with an 3rd party
>> database manager tool, that the changes are saved in the database.
>>
>> Then from my menu the second plugin is called. It will just read the
>> data and then show and do some visualisation with it, it shows data
>> which is old. All new added or modified objects from my first plugin
>> are not shown. I have to quit the program and restart it, and then my
>> second plugin also sees the changes.
>>
>> Since the database connection for my second plugin is established
>> after the first plugin flushed all data and closed the transaction, ..
>>
>> ...why does my second plugin not see the changes?
>>
>> my code is more or less:
>>
>> ...
>> private List<A> aList = new ArrayList<A>();
>>
>> public void loadData() {
>>
>> dbDriver = get...
>> dbUrl = get...
>> dbUser = get...
>> dbPass = get...
>>
>> if (dbUrl.contains("derby:")) setLocalDatabase(true);
>>
>> Map properties = new HashMap();
>> properties.put("javax.persistence.jdbc.driver", dbDriver);
>> properties.put("javax.persistence.jdbc.url", dbUrl);
>> properties.put("javax.persistence.jdbc.user", dbUser);
>> properties.put("javax.persistence.jdbc.password", dbPass);
>> try {
>> factory = Persistence.createEntityManagerFactory(
>> PERSISTENCE_UNIT_NAME, properties);
>> } catch (Exception e) {
>> System.out.println(e);
>> }
>> em = factory.createEntityManager();
>>
>> em.clear();
>>
>> Query q1 = em.createQuery("SELECT m FROM A m ORDER BY m.position, m.name
>> ASC");
>>
>> aList.clear();
>> aList.addAll(q.getResultList());
>>
>> }
>>
>> Can you help and tell my what I am doing wrong? Why doesnt the second
>> plugin see the changes?
>>
>> Thanks
>>
>> Raven
>> _______________________________________________
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>> eclipselink-users@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
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