Question

Well, by means of historical session, we can query an object at a specific time. But what I need is to query all the versions of that object..

The documentation points out that we can not do this.. But is there anyone that customize eclipselink for this behaviour?..

edit : well, this question has been asked at eclipselink forums. It seems that nobody interested in this question.

EDIT :
I have requested an enhancement request. If you want this enhancement, please vote.. Here is the link : https://bugs.eclipse.org/bugs/show_bug.cgi?id=333725

Answer 1

Here is the answer from eclipselink forum ..

There does not seem to be an easy way
to do this. Please log an enhancement
request and vote for it.

You can use a native SQL query for
this. You will need to set
“eclipselink.maintain-cache”=”true” on
the query.

You could also map a separate class to
the historical table, and include the
start and end date in the object, and
the startDate as part of the Id. This
is really what you would want to do,
as querying the original class will
not give you access to the start and
end dates. You could use a
MappedSuperclass and have the current
and historical class subclass it and
use the different tables.