Re: [basex-talk] Simple query

On 3/10/2017 2:24 PM, Kendall Shaw wrote:

Michael Seiferle gave the answer already, I think. What would collection() be referring to? How would BaseX know what to return? Probably there is no database specified. Presumably, in the GUI you have opened a database.

Yes, I did not include my code to open the database. There is a database open and this does not throw an exception, it just returns no results.

In my constructor of this class there is the following code: new Check(this.MyID).execute(context);

(MyID is a String identifying the database I want to work with exclusively with this context passed.)

As I mentioned in a separate post, my query where matches(uri...) works fine...every time. That query also does not have a specific collection in the query.

Kendall

*From: *basex-talk-bounces@mailman.uni-konstanz.de on behalf of AJ Weber aweber@comcast.net *Date: *Friday, March 10, 2017 at 6:44 AM *To: *Fabrice ETANCHAUD fetanchaud@groupefbo.com, "basex-talk@mailman.uni-konstanz.de" basex-talk@mailman.uni-konstanz.de *Subject: *Re: [basex-talk] Simple query

On 3/9/2017 3:46 AM, Fabrice ETANCHAUD wrote:

Hello Aaron,

You would learn faster by using the BaseXGUI application,

You will benefit from syntax highlighting, real time execution,
and hits on function signatures.

I am trying the GUI now. It is an excellent tool!

However, issuing the same exact XQuery in the GUI returns 3 documents (which is what I would have originally expected).

Maybe it is an issue with how I setup my query in java? Here is my code:

    try (LocalSession session = new LocalSession(this.context)) {
        //test

        try (Query q = session.query("for $doc in collection() 

return $doc")) { while (q.more()) { LOG.debug("RESULT: " + q.next()); } } } catch (Exception e) { LOG.error("Could not execute query " + statement, e); }

Best regards,

Fabrice

*De :*basex-talk-bounces@mailman.uni-konstanz.de
<mailto:basex-talk-bounces@mailman.uni-konstanz.de>
[mailto:basex-talk-bounces@mailman.uni-konstanz.de] *De la part
de* Aaron Weber
*Envoyé :* jeudi 9 mars 2017 00:31
*À :* basex-talk@mailman.uni-konstanz.de
<mailto:basex-talk@mailman.uni-konstanz.de>
*Objet :* [basex-talk] Simple query

Newbie alert.

I'm trying to get my feet wet with BaseX, and in doing so, am
trying to understand XQuery and how to apply it to a database full
of documents (not just a single document that is typically queried).

I am using Java and can post my code, but with a LocalSession, and
a query, the following produces 0 results.

For $doc in collection() return $doc

I realize there's no "where", and in the sql world that would
match all. Maybe not in XQuery?

Obviously just a test query, but I need to start somewhere. :-)

Thanks for any help!
-- 
AJ