BaseX-Talk

basex-talk@mailman.uni-konstanz.de

6 participants
5269 discussions

Re: [basex-talk] Full-text speed
by Thomas Goossens 10 Feb '10

10 Feb '10

[sorry for the previous message, my mistake] Hello Christian, thanks for your very fast reply (in middle of the night...) Indeed the query you gave me runs much faster. But... 1) that's not my query: I was using 'all words', and my query still runs without index. 2) I think that 'text() 'is not equivalent to '.'. For example I could not use text() here //SPEECH[ . contains text "romeo juliet" all words] By the way, this query just doesn't work (while it should return 42 hits). Never mind, I am sure you will fix that soon. Cheers. On Thu, Feb 11, 2010 at 12:42 AM, Christian Grün <christian.gruen(a)gmail.com>wrote: > Hi Thomas, > > your query will be evaluated much faster if you rewrite it to.. > > //LINE[ text() contains text "romeo juliet"] > > This query should take ~3-5 ms on the 7.5mb Shakespeare instance. > > You can have a look into our XQuery documentation > (http://basex.org/xquery, Section »Query Evaluation«) to get more > insight on query compilation and how to utilize the index structures. > > Hope this helps, > Christian >

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Database creation error on Windows Vista SP 2 64-bit
by dnm＠pobox.com 04 Feb '10

04 Feb '10

Hi there, I recently downloaded and tried to use BaseX 6 on Windows Vista SP 2 64-bit. I'm consistently experiencing an error message whenever I try to create a database (which seems to be necessary even when trying to open a database). I'm using BaseX in GUI mode. I've seen this behavior with both the BaseX6.exe version (initially) and the .jar as packaged in the BaseX6.zip archive (as a second test). I've included a link to a PNG file below which will hopefully show up. http://dl.dropbox.com/u/395437/basex6-db-creation-error.png Thanks in advance for any help!

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BaseX server without X Window System on Linux
by Steven Anderson 03 Feb '10

03 Feb '10

My Linux server doesn't have X. When I try to run the BaseX server, with the command: java -Xmx1024m -jar BaseX.jar org.basex.BaseXServer I get the following error: No X11 DISPLAY variable was set, but this program performed an operation which requires it. Can I run the server without X? Steve

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bug in namespace resolution after inserts
by Rares Vernica 03 Feb '10

03 Feb '10

Hello, I think there might be a bug in namespace resolution after an insert. I have two xml files: doc.xml <?xml version="1.0" encoding="UTF-8"?> <doc xmlns:a="http://a"> <a:x>1</a:x> </doc> doc2.xml <?xml version="1.0" encoding="UTF-8"?> <r xmlns="http://b" xmlns:a="http://a"> <a:x>2</a:x> </r> I create database "doc" from "doc.xml". Then, I preform the following insert query: declare namespace a = "http://a"; declare namespace b = "http://b"; insert nodes doc("doc2.xml")/b:r/a:x into basex:db("doc")/doc and the result is: <doc xmlns:a="http://a"> <a:x>1</a:x> <a:x xmlns="http://b">2</a:x> </doc> but basex:db("doc")/doc/a:x returns <a:x xmlns:a="http://a">1</a:x> Cheers, Rares

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BaseX 6 GUI does not start properly
by Rares Vernica 02 Feb '10

02 Feb '10

Hello, I used BaseX GUI before version 6 successfully. Version 6 GUI does not start properly and throws a lot of exceptions. Here is the first one: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at sun.java2d.SunGraphics2D.addRenderingHints(SunGraphics2D.java:1295) at org.basex.gui.layout.BaseXBack.paintComponent(BaseXBack.java:62) at org.basex.gui.view.ViewContainer.paintComponent(ViewContainer.java:114) at javax.swing.JComponent.paint(JComponent.java:1029) at org.basex.gui.view.ViewContainer.paint(ViewContainer.java:269) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278) at javax.swing.RepaintManager.paint(RepaintManager.java:1220) at javax.swing.JComponent._paintImmediately(JComponent.java:5072) at javax.swing.JComponent.paintImmediately(JComponent.java:4882) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714) at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) The main window loads but it is empty. If I hover over the window with my mouse, the buttons start appearing. Anyway, it is unusable. I do not have this issue with 5.7. Here is the Java version that I use: > java -version java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing) The computer is a 32bit PC with the latest Ubuntu OS. Thank you for BaseX. Keep up the good work! Cheers, Rares Vernica

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FileTransit - Product Submission Approved
by FileTransit 01 Feb '10

01 Feb '10

Dear Developer, Your product, BaseX, has been published today on our site. Category: Windows Software / Programming / Database Tools Name: BaseX URL: http://www.filetransit.com/view.php?id=35541 Best Regards, FileTransit Team. http://www.filetransit.com/ Â© 1998-2010 FileTransit.com

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xpath expressions vs xquery select
by Travis Webb 31 Jan '10

31 Jan '10

I'm trying to figure out which is more efficient (xpath or xquery select), so if someone has knowledge on this I'd appreciate any input. This may or may not be specific to the implementation of BaseX. For example, the following queries return the same thing, but which one is faster? Does basex treat them the same way? 1 uses xquery select, 2 uses xpath 1. for $x in doc('test')/* where $x/node="value" return $x OR 2. for $x in doc('test')/*[node="value"] return $x Thanks. -tjw

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Certificate for BaseX - Works with Vista
by FreeVistaFiles.com 29 Jan '10

29 Jan '10

January 29, 2010 ************************** Hello DBIS Group, University of Konstanz, We are glad to let you know that your software "BaseX" have received a "Works with Vista" certificate. You must know, no more than 20% of all software titles from our site will receive this award. ----------------------------------------------------------------------------------------------------- You should use this certificate by displaying it on your website or inside your product: CERTIFY IMAGE URL: http://www.freevistafiles.com/images/vista_certificate.png URL: http://www.freevistafiles.com/ TITLE: Windows Vista Downloads Best Regards, Free Vista Files team http://www.freevistafiles.com/

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Re: [basex-talk] BaseX questions
by Christian Grün 28 Jan '10

28 Jan '10

Dear Swaminathan, On Thu, Jan 28, 2010 at 8:48 AM, Swaminathan S <swami2(a)gmail.com> wrote: > Hi Christian, > > I am will be using BaseX for multiple xml files that are about 1GB size > (few million lines of in the file). I will be doing transactions on these > BaseX databases in any sequence (For example: an update on databaseA, an > update on databaseB, few Queries on databaseC, few updates on databaseB > ...). > > Could you please give your reply on the following questions: > > My questions: > > Question 1) Does creating a Collection object (see example below) a > costly operation in terms of memory utilization? Also, let > Collection collection = > database_.getCollection("basex://localhost:1984/databaseName", null, null) I guess you are using the XML:DB API? Creating a collection should be very cheap (i.e., not take longer than some milliseconds). > Question 2) Suppose I do the following steps in the order given below: > > a) create a Collection on the database > b) create a XPathQueryService object as below: > service = (XPathQueryService) collection.getService( "XPathQueryService", > "1.0" ); > c) Run Xquery Updates on the database using "Xquery" object of BaseX. > d) query the collection created in step a) as follows: > ResourceSet resourceSet = service.query("< my query>") > > Will my "query" in step d) be able to see the "updates" made in step c) ? > Could you please let me know briefly if there are some concept of > "Collection" I need to know. All database updates will be reflected by subsequent queries. I'm not 100% sure, however, what you refer to with the "Xquery" object? The usual approach to perform queries with the XML:DB API is to call the query() method: XPathQueryService.query(query); ..see also http://basex.org/code.php?code=XMLDBQuery > Question 3) When I do an Xquery on an invalid xpath (or do > xPathQueryService.query() on an invalid xpath), BaseX is not throwing an > exception. Our application would need this functionality. Could you please > give your comments on this? Well, it depends on what you call "invalid". As long as an XPath query is correct, according to the language specification, no errors will be thrown. If you use tag names in your location path that do not occur in the original XML document, the query processor cannot guess that this was done by mistake. > Question 4) I have two choices to run queries on BaseX database a) using > Xquery object b) using XPathQueryService on a Collection. Could you please > let me know which is better and in which scenarios? So you talk about using our own API vs. the XML:DB API? In general, I would recommend to stick to one single API and not mix them up. Next, we observe that most users end up using our own API and discard XQJ and XML:DB, as these APIs do not come up to all expectations – at least in their current stage. Hope this helps, Christian fyi: I've forwarded your e-mail to the basex-talk mailing list.

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Re: [basex-talk] BaseX db questions
by Christian Grün 28 Jan '10

28 Jan '10

Dear Aleks, > Adding a flag would be great , this will helps out so that we can sync database changes into xml file in one call. I've added the flag which allows updates files to be written back to disk. Note that, currently, all files of a modified database will be written back to disk after an update operation has been completed. Note that this is experimental; you're invited to test the latest version of the sources, which you find in our Subversion repository. The flag can be activated via the SET command in BaseX: Command Line: set writeback on; create db input.xml; xquery delete node //text() BaseX API: Context ctx = new Context(); new Set("WRITEBACK", true).execute(ctx); new CreateDB("input.xml").execute(ctx); new XQuery("xquery delete node //text()").execute(ctx); > We are getting the following exception while performing query against database : > Main.notexpected(Object...) line: 205 > TableDiskAccess.cursor(int) line: 326 > [...] > Can you shade some light why would this happen ? this problem happens randomly. This exception might (but need not) indicate an inconsistency in the data storage. It would be great if you could try to create a reproducible example – although I guess this might not be easy if the issue occurs only randomly. > We currently create a single Context object for every open database and keep passing this context for every call, do you think this will cause the problem ? That should be fine. Do you close the database/context – data.close() / context.close() – after all updates have been processed? All the best, Christian

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