Comments on: Query Your Toaster

By: How to Get Six Pack Fast

How to Get Six Pack Fast — Wed, 15 Apr 2009 16:56:19 +0000

Not that I’m totally impressed, but this is a lot more than I expected when I stumpled upon a link on Digg telling that the info is awesome. Thanks.

By: Michael Nowak

Michael Nowak — Mon, 23 Jun 2008 22:38:31 +0000

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By: englich

englich — Fri, 14 Dec 2007 12:19:05 +0000

Hi again aep,

We want it to be as powerful as one needs, so if you have any suggestions for what API changes to do or what that needs to be added in order to do these more database centric things you’re welcome to mail it to me.

I’m in particular interested in:

* how QAbstractXmlForwardIterator(I guess it’s that one you’re referring to) can be made more efficient
* In what way QAbstractXmlNodeModel requires all data to be held in memory(and possible what changes that would help)
* Apart from that Patternist shipping with a database backend, what kind of hooks/features related to fn:collection() would you like?

By: aep

aep — Thu, 13 Dec 2007 21:26:11 +0000

Hi,
awesome stuff you have there. I just checked out the 4.4 snapshot and tryed it.
I’m looking into replacing berkley xmldb with something less a pita. Unfortunatly what i see in the snapshot is still not powerfull enought to drive a several thounds of documents big database. The XQuery implementation lacks an option to define indexes, like bdxml has.
also QAbstractXmlNodeModel assumes you have all the data in one big file, wich is not the case for what i have here with bdxml (it uses fn:collection() ). of course i
could map all the small files to a big one, but seeing that the iterators are not quiet efficient, that would mean loading several terrabytes into the ram…
I really hope there will be some work on patternist before the release. i want to get rid of that darn xmldb and finally use somthing as lovely as Qt.

By: Berzeck

Berzeck — Tue, 11 Dec 2007 18:54:23 +0000

Hi, i am trying to develop a client – server application, the server connects to the database and the clients connect to the server, my problem is how do i serialize database querys ( including blobs ) and pass them via network from the server to the client ?

Can i use XQuery to implement a solution ?

PD: Sorry my bad english

thank you

By: englich

englich — Sun, 02 Dec 2007 12:00:34 +0000

Hi Jeff,

No it isn’t. Patternist is written from the ground up to be clean C++ code, and to be based the XPath Data Model, such that XQuery, and XPath/XSL-T 2.0 as opposed to 1.0, can be/is implemented. libxml2 & libxslt are of course awesome, but they will never reach the things built on top of the XPath Data Model, as Daniel Veillard has stated.

By: Jeff

Jeff — Sun, 02 Dec 2007 00:49:23 +0000

Is TrollTechs XML API based on the libXML project?

By: englich

englich — Mon, 19 Nov 2007 14:44:54 +0000

Hi Eric,

I think the example supports that by default, since it uses QFileInfo, and QFileInfo use QAbstractFileEngine. Feel free to have a look at the example, you’ll find it in the Qt snapshot, under examples/xmlpatterns/filetree/.

Cheers,
Frans

By: Eric Landuyt

Eric Landuyt — Mon, 19 Nov 2007 14:09:35 +0000

That’s really interesting! What about supporting any custom file engine based on QAbstractFileEngine ? Or simply supporting QDir/QFile ?

By: Richard Moore

Richard Moore — Thu, 15 Nov 2007 16:40:12 +0000

One thing that would be neat would be letting you use XPath queries against the QObject hierarchy from QtScript. I shouldn’t think it would be too hard to do this either.