RE: jena and StmtIterator is time consuming operation

[Khandeshi, Ami D]

I am not clear, how I can reply to the thread. 

 

Thanks Andy for your  below response.

What kind of dataset are you querying?

 

Often, much of th work is done on first call of .hasNext and .execSelect


is just setup.  You can do:

 

ResultSet results = qexec.execSelect();

qexec.hasNext() ;

 

as hasNext() is (as is correct for iterators) idempotent between calls 

of .next.

 

 

Results aren't a StmtIterator,

 

 

Correct me if I am wrong.  Qexec.execSelect() is executing the query?
And results.hasNext() lets you iterate thru the results correct?   If
that is true, then the time it begins iterating thru the iterator seems
extremely slow, why is  that the case?

 

B.t.w.  I don't see qexect.hasNext() as you suggest - what am I missing.


 

 

 

 

From: Khandeshi, Ami D 
Sent: Friday, March 18, 2011 3:10 PM
To: jena-users@incubator.apache.org
Subject: jena and StmtIterator is time consuming operation

 

Hi all,

 

I noticed that iterating thru stmtiterator (thru hasNext) seems take
long time.  Can you suggest better/more efficient way to get information
in a stattments?

 

Here is a code base where execution query is fast, iterating thru result
is time consuming.

 

Thanks,

 

Ami

                        ResultSet results = qexec.execSelect();

                        System.out.println("got result");

                  List<Entity> entities = new ArrayList();

                  long time=System.currentTimeMillis();

                  System.out.println("Start Iteator");

                        for ( ; results.hasNext() ; )  {

 

                        System.out.println("In
iterator"+(time-System.currentTimeMillis()));