[jdom-interest] Ampersand question

tsasala at hifusion.com tsasala at hifusion.com
Fri Jul 14 04:15:59 PDT 2000

Alex Chaffee wrote:
> All I meant was that java.sql.Blob.getBinaryStream() returns an
> InputStream.  (I'm not sure how it's implemented behind the scenes by
> drivers.)  I was imagining XML being stored directly in the DB, since
> I think you mentioned blobs at one point.

	Actually, *you* mentioned blobs ;)  We're stuck with Sybase.

> Without looking in detail at your architecture, I'm not sure how much
> it applies, but my main point was, try to eliminate middle steps.  If
> you have, e.g., code that turns a result set into an XML string, then
> more code that turns the XML string into a JDOM tree, then it would be
> more efficient to have code that turns the ResultSet into a JDOM tree directly.
> Barring that (and I think you did bar that by saying "this is not my
> choice"), the next best thing would be to make sure when building your
> string to make liberal use of StringBuffer.append rather than making
> individual strings and then later StringBuffer.appending them together
> (this happens when using +).  Each new string gets (a) copied, wasting
> time, and (b) abandoned in the heap, wasting a little space, requiring
> GC to happen more frequently, and making the heap more fragmented when
> GC is done, which increases the memory footprint of the app.

	The vast majority of our work is done with the JDOM object
and only persisted as a string.  But these are good points to note
for the future.


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