The way you described it is the right way: context.deleteObject(..);
context.commitChanges(). So I guess you'll need to check the code to
see why nothing gets deleted. Maybe nothing gets selected in the
first place? Does select query prints a result count that is greater
than zero?
Andrus
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On Jun 27, 2006, at 10:43 AM, Pirola Davide wrote:
>
> Hi all,
> i have a problem with the "DELETE" operation.
> I have "TimerTask" that every 5 minutes load data from an Oracle
> Database and insert them into HsqlDb (locale to the application).
> So every 5 minutes my table on HSQLDB receive some "INSERT" commands.
> I do this with this peace of code:
>
> for (....all my objects)
> {
> datacontext.registerNewObject(myobject)
> datacontext.commitChanges()
> }
>
>
> But, first of all, i need to "DELETE" data that are older than 60
> minutes.
> So i try to delete these data in this way:
>
> 1) i execute a SELECT query on the table (HSQLDB)getting all record
> that are older than 60 minutes.
>
> 2) for every object retrived, i execute "datacontext.delete(myobject)"
>
> 3) at the end i call "datacontext.commitChanges()".
>
> I expect to see some "DELETE" query over my HSQLDB... but nothing
> appen :-S
> So no data are deleted... and my database grow :(
>
> There is another way for doing this task... execute directly the
> delete query:
> "DELETE FROM mytable WHERE DATEDIFF('mi',INSERT_DATE, NOW()) > 60 "
>
> but..in this way.. the data in the table are deleted, but cayenne
> takes in the Heap (Old Gen) the reference of the old objects... so
> the garbage collector can't remove them from memory.(memory leak)
>
> So question is... which is the right way to delete data in a table
> using cayenne?
>
> Thanks,
> Davide
>
>
>
>
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