BaseX-Talk March 2011

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30 participants
43 discussions

How to delete a node with PHP?
by Yoann Maingon 07 Mar '11

07 Mar '11

Hi, I've started using BaseX as a database for a PHP project. I can open the database and add nodes but I can't delete nodes. I've tested the XQUERY on the GUI and it works just fine. Any clue? Here is the xquery: Here is the php code: [.] $session->execute("OPEN data"); $session->execute("XQUERY delete nodes (//definition/item[@type='test'])"); I've tried without "XQUERY" but gives the same result. Would be nice to have a working example of such use. Best Regards, Yoann Maingon --------------------------------------- Yoann Maingon Prodeos +33 6.64.32.49.66 <mailto:yoann.maingon@prodeos.com> yoann.maingon(a)prodeos.com LOGO_14032009_OnWhite_Signature www.prodeos.com

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Problem with Wikipedia database (or a more general namespace efficiency problem?)
by NewIntellectual 01 Mar '11

01 Mar '11

As both a stress test and to experiment, I created a database using a recent complete (current page) dump of English Wikipedia, a hefty file of 30.5 GB. I don't have enough memory apparently to create a full-text index of all of that text, so I created the DB without one. My first testing came up empty until I realized that I needed to deal with the namespace (ugh). Then I tried: declare default element namespace "http://www.mediawiki.org/xml/export-0.4/ "; //siteinfo This contains a small amount of data and occurs only once in the document (at /mediawiki/siteinfo). However, it's extremely slow (~33 seconds on my system). The query plan is: <IterPath> <Root/> <IterStep axis="child" test="*:mediawiki"/> <IterStep axis="child" test="*:siteinfo"/> </IterPath> Timing: - Parsing: 0.35 ms - Compiling: 0.22 ms - Evaluating: 33316.32 ms - Printing: 0.3 ms - Total Time: 33317.19 ms My surmise is that millions of node names are being checked rather than a path index being used to rapidly access the appropriate node(s). I don't think such a simple query should fail to be properly optimized. Another surmise is that it's related to namespaces not being indexed (?). While personally I very much dislike namespaces, they are common, and they have to be efficiently handled. To see if it made a difference, I also tried an explicitly named namespace test: declare namespace w="http://www.mediawiki.org/xml/export-0.4/"; //w:siteinfo This results in: <IterPath> <Root/> <IterStep axis="descendant" test="w:siteinfo"/> </IterPath> Timing: - Parsing: 0.33 ms - Compiling: 0.07 ms - Evaluating: 54288.51 ms - Printing: 0.3 ms - Total Time: 54289.23 ms So performance is even worse.

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EXPath ZIP Module
by Christian Grün 28 Feb '11

28 Feb '11

Dear all, BaseX now offers (slightly modified) support for the EXPath ZIP Module. This module allows everyone to extract files from ZIP archives, list its contents, create new archives, and update existing archives. As far as we know, our implementation is the first one which is simply usable out of the box, and may be the first complete implementation as well. The ZIP Module is included in our latest build, available at: http://files.basex.org/releases/latest/ Please have a look at our documentation to find more details and examples: http://docs.basex.org/wiki/ZIP_Functions All the best, Christian ___________________________ BaseX Christian Grün Uni KN, Box 188 78457 Konstanz, Germany http://www.inf.uni-konstanz.de/~gruen

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BaseX-Talk March 2011