Hi,
I'm using OJB and I want to save a result set to file, then recreate it at
a later time. I want to do something like the following:
Collection result = broker.getCollectionByQuery(query);
File file = new File(filename);
OutputStream out = new FileOutputStream(file);
MySerializer ser = new MySerializer();
ser.serialize(out, result);
out.close();
(here the user can pause from minutes to several days/weeks)
Then at a later point in time I want to recreate the collection from the
file.
File file = new File(filename);
InputStream in = new FileInputStream(file);
MySerializer ser = new MySerializer();
Collection result = ser.unserialize(in);
in.close();
Iterator itor = result.iterator();
while(itor.hasNext())
System.out.println(itor.next());
BUT, I do not want to serialize the whole object(s). I just want to write
the primary key of each object in the result set to the file.
Before I start to re-invent the wheel (which I have done many times), is
there something similar already?
If not, how do I get hold of each primary key in a collection in an
efficient way (without materializing each object)?
Somewhere in the back of my head I heard of a java standard for
"disconnected result sets". Is that something I should dig deeper into?
/Goran Ehrsson
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