BaseX-Talk

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9 participants
5241 discussions

Re: [basex-talk] BaseX [NOT PROTECTIVELY MARKED]
by Christian Grün 18 Aug '10

18 Aug '10

Hi Peter (cc to the mailing list), the following page might interesting for you, on which we've compiled some statistics on created databases: http://basex.org/documents Reg. number of documents and single doc size: the number depends on various meta data such as the number of XML nodes in the document. As you can see on the quoted page, we've added 10 Mio. documents of the CoPhIR collection in one database, and one document with 421 GB. As soon as one database gets too large, several databases can be created and accessed by a single XQuery. Hope this helps, Christian On Wed, Aug 18, 2010 at 2:59 PM, <Peter.Winstanley(a)scotland.gsi.gov.uk> wrote: > Classification: NOT PROTECTIVELY MARKED > > Hi Christian > > I've just started looking at BaseX and would appreciate some pointers to > performance information. My obvious expectation for comparisons would be > with eXist and MarkLogic. > > I was wondering if you had any information on the maximum numbers of > documents that BaseX can handle, and also the maximum size of a single > document that could be practically handled (here I'm thinking about > multi-dimensional data 'cubes') > > Kind regards > > Peter > > Dr Peter Winstanley > ISIS: Information Management Unit > The Scottish Government > 5 Atlantic Quay > 150 Broomielaw > Glasgow G2 8LU > Scotland > 0300 244 6895

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BaseX as persistence layer
by chas＠munat.com 18 Aug '10

18 Aug '10

I'm trying to use BaseX as a persistence layer in a project (together with XStream). I have a few questions and I'm not having any luck with the documentation. I've gotten pretty far. I have a User object (simplified for this example) with an id (UUID), a username (String), and a password (String). XStream turns this into: <User> <id>98bdb472-97ad-4de1-b1c6-a482d7f06d94</id> <username>Chas</username> <password>secret</password> </User> I've created a DB called "db" (clever, huh?): new CreateDB("cop", "<blog><users/></blog>").execute(context) QUESTION: If I rerun the above, will it overwrite the DB if it already exists, or will it just open the existing DB? Can't find anything in the API about that. Then I save my User like this: new XQuery("insert node" + chas + " into /blog/users").execute(context) where chas is the above XML. This works great! When I need to reinflate the object, I just do: chas = new XQuery(""" for $x in /forum/users/User where $x/username="Chas" return $x """).execute(context) Then I use XStream to reinflate the object. Any suggestions for improvement? So now the problem. I need to update this object in the database. The simplest way is just to update the whole object. So I change my username and use XStream to create the new XML: <User> <id>98bdb472-97ad-4de1-b1c6-a482d7f06d94</id> <username>Charles</username> <password>secret</password> </User> I read that one must use put() to export the changes, but maybe I'm misunderstanding this. I'm have this: for $x in /forum/users/User where $x/username="Chas" return replace node $x with " + chas This and seems to work, but then when I try to delete the node thus: for $x in /forum/users/User where $x/password="secret" return delete nodes $x It does not work. What am I missing? Thanks for any help. If this thing works, I'm happy to open it up so others can work on it, too. Chas.

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Schwerer Bug von Namespace!
by Truong An Nguyen 18 Aug '10

18 Aug '10

Hallo, ich verwende im Moment die BaseX 6.2.4. Wieso sind die Namespaces unterschiedlich behandelt in zwei folgenden Situationen: + Fall 1: Die Datenbank wurden erzeugt von einem ganzen Ordner: Create Database c:\Root declare namespace ns='http://iso.org/OTX'; collection('Root')/ns:otx/ns:procedures/ns:procedure/ns:realisation Die Ergbenisse sind: "<realisation xmlns:hmi="http://iso.org/OTX/StandardInterface/HMI" xmlns:diag="http://iso.org/OTX/StandardInterface/DiagCom" xmlns:env="http://iso.org/OTX/StandardInterface/Environment"> + Fall 2: Die gleiche Datei wurde zu einer leeren Collection hinzugefügt. Create Database Empty Add TO c:\Root c:\Root\file.xml Dann funktioniert die Abfrage im Fall 1 nicht mehr. Wenn ich die Namespace von procedures, procedure und realisation wie folgend wegmache, funktioniert es. declare namespace ns='http://iso.org/OTX'; collection('Root')/ns:otx/procedures/procedure/realisation Aber alle Namespace-Informationen im Ergebnis sind auch weg. Ich bekomme nur "<realisation> ...." Fall 2 ist mir sehr wichtig. Könntet ihr bitte diesen Bug beheben? Vielen Dank Gruß, An

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Q.: safety/concurrent access to BaseX database
by Godmar Back 17 Aug '10

17 Aug '10

Hi, I just wanted to confirm some assumptions about the safety of accessing a single BaseX instance from multiple JVMs, or from multiple org.basex.api.xqj.BXQDataSource class instances loaded by different class loaders in the same VM. Am I correct that it is safe to access the same database via XQJ in such situations? By "safety," I mean that a) the database protects its internal data structures in the face of such concurrency and b) there is a serializable schedule of individual XQJ executions that produces the final database state. Is this true? Please note that I'm not asking for transactions across multiple XQJ executions here. - Godmar

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BaseX namespace bugs und kein Ende
by Godmar Back 17 Aug '10

17 Aug '10

Here's a test case: http://top.cs.vt.edu/~gback/bx/b622/TestNS.java We insert a node, BaseX ignores its namespace and produces wrong XML. - Godmar

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Error while creating an attribute index with the latest from SVN
by Huib Verweij 17 Aug '10

17 Aug '10

Hi, I am using the latest version from the SVN repo. It works mostly fine, but it reported that an attribute index wasn't present. Trying to add the Attribute index threw up this error. Possible bug? Feedback is welcome: basex-talk(a)mailman.uni-konstanz.de BaseX 6.2.4: java.lang.ArrayIndexOutOfBoundsException: 0 org.basex.util.Num.size(Num.java:97) org.basex.index.ValueBuilder.write(ValueBuilder.java:193) org.basex.index.ValueBuilder.merge(ValueBuilder.java:143) org.basex.index.ValueBuilder.build(ValueBuilder.java:92) org.basex.index.ValueBuilder.build(ValueBuilder.java:40) org.basex.core.cmd.ACreate.index(ACreate.java:121) org.basex.core.cmd.CreateIndex.run(CreateIndex.java:63) org.basex.core.Command.run(Command.java:234) org.basex.core.Command.exec(Command.java:217) org.basex.core.Command.execute(Command.java:65) org.basex.core.Command.execute(Command.java:77) org.basex.gui.GUICommands$50.run(GUICommands.java:963) I tried exporting everything and reloading it again, but strangely enough it couldn't parse one file that oXygen could parse without problems. Anyway, after all documents except one were reloaded into the db it reported a missing attribute index. I tried to add it again, but I got the same error again. I know I'm not using a release version, I'm not complaining, just reporting. Regards, Huib.

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Re: [basex-talk] Starting Server --> Exception in thread
by Hänzi Martina (s) 17 Aug '10

17 Aug '10

Yes, it's working with java 6 thanks ________________________________________ Von: Lukas Lewandowski [lukas.lewandowski(a)uni-konstanz.de] Gesendet: Montag, 16. August 2010 10:27 An: Hänzi Martina (s) Betreff: Re: [basex-talk] Starting Server --> Exception in thread Hi Martina, does it work now? If not, which java version do you use? BaseX and its packages need at least java 6. regards Lukas Hänzi Martina (s) wrote: > Hi Andreas > > Thanks for your quick answer. Now I got this error, if i execute "java -cp BaseX61.jar org.basex.BaseXServer" in the Filer "basex-api": > Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file > at java.lang.ClassLoader.defineClass1(Native Method) > at java.lang.ClassLoader.defineClass(ClassLoader.java:676) > at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) > at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) > at java.net.URLClassLoader.access$100(URLClassLoader.java:56) > at java.net.URLClassLoader$1.run(URLClassLoader.java:195) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:317) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280) > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375) > > i downloaded the basex-api.zip from the uni konstanz homepage. > > Any ideas whats wrong? I don't think its realy the .class file > > thanks and kind regards > Martina > > > > ________________________________________ > Von: Andreas Weiler [andreas.weiler(a)uni-konstanz.de] > Gesendet: Samstag, 14. August 2010 10:34 > An: Hänzi Martina (s) > Cc: basex-talk(a)mailman.uni-konstanz.de > Betreff: Re: [basex-talk] Starting Server --> Exception in thread > > Hi Martina, > > if you just want to start the BaseXServer you have to download BaseX61.jar > and call it with: > java -cp BaseX61.jar org.basex.BaseXServer > > if you want to use the JAX-RX Interface to communicate with the BaseXServer > have a look at this documentation page: > http://www.inf.uni-konstanz.de/dbis/basex/rest > > Kind regards, > Andreas > > martina.haenzi(a)students.fhnw.ch schrieb: > >> Hi >> >> I have a problem with starting the Server on my MacBook. >> If I execute the Unix-File from basex-api (startjaxrx) the Terminal displays: >> "Exception in thread "main" java.lang.NoClassDefFoundError: StartJaxRx >> logout" >> >> And if I execute the Jar-File (BaseX61-jaxrx.jar) this Error displays on the console: "Faild to load Main-Class manifest attribut from >> /Applications/basex-api/BaseX61-jaxrx.jar" >> >> >> If I'm using BaseX on my virtual machine (Windows XP professional) there ist a similar problem. The MS-DOS-File displays: >> "Exception in thread "main" org.jaxrx.core.JaxRxException >> at org.jaxrx.StartJetty.<init>(StartJetty.java:46) >> at StartJaxRx.main(StartJetty.java:41)" >> >> What am I doing wrong? >> >> Thanks for your help. >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk(a)mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >> >> > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > >

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processing large file and saving results in GUI
by Gérard Dupont 15 Aug '10

15 Aug '10

Hi all I'm trying to process some large XML file (~6.5Go). It goes quite fine thanks to the stateless approach of Xquery. But then when I want to save the results, I face some difficulty. The process freeze for a time (few minutes) but the final file is empty and I got no error on the console. The results it self should be quite small (~50 to 70Mo max) but I can't get it saved... That's a pity since the process has been achieved (note that I'm using the GUI). Is there any way to specify in the query to save the result in a file ? Should I use the CLI ? Any advices are welcome, I just start with BaseX. cheers -- Gérard Dupont Information Processing Control and Cognition (IPCC) - EADS DS http://weblab.ow2.org Document & Learning team - LITIS Laboratory

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Starting Server --> Exception in thread
by martina.haenzi＠students.fhnw.ch 14 Aug '10

14 Aug '10

Hi I have a problem with starting the Server on my MacBook. If I execute the Unix-File from basex-api (startjaxrx) the Terminal displays: "Exception in thread "main" java.lang.NoClassDefFoundError: StartJaxRx logout" And if I execute the Jar-File (BaseX61-jaxrx.jar) this Error displays on the console: "Faild to load Main-Class manifest attribut from /Applications/basex-api/BaseX61-jaxrx.jar" If I'm using BaseX on my virtual machine (Windows XP professional) there ist a similar problem. The MS-DOS-File displays: "Exception in thread "main" org.jaxrx.core.JaxRxException at org.jaxrx.StartJetty.<init>(StartJetty.java:46) at StartJaxRx.main(StartJetty.java:41)" What am I doing wrong? Thanks for your help.

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Re: [basex-talk] Bugs von Standardnamespace!
by Lukas Kircher 13 Aug '10

13 Aug '10

Ich schicke deine Mail mal noch als CC an die Mailing Liste. > Wie kann ich einstellen, damit zwei XML-Dateien mit dem gleichen Namen > aber mit verschiedenen Pfäden in einer Datenbank gespeichert werden? Das funktioniert mit Hilfe von Collections. Du kannst folgendermassen Dokumente zu einer Collection hinzufuegen: 1. Falls alle Dokumente in einem Verzeichnis liegen kannst du aus dem obersten Ordner per Create Command eine Datenbank erstellen [1]. 2. Zu einer bestehenden Collection kannst du ein Dokument hinzufuegen per XQuery Update, z.B.: insert node doc(<uri>) into doc(<collection name>) ... oder ueber den BaseX Command Add [2]. Dokumente mit gleichem Namen aber unterschiedlichem Pfad kannst du mit Hilfe von document-uri() auseinanderhalten - siehe Beispiel: for $i in collection() return document-uri($i) Ich hoffe dir ist damit geholfen. Ich leite die Mail ebenfalls an die Liste weiter, damit mich andere korrigieren oder etwas hinzufuegen koennen. Gruesse, Lukas [1] http://www.inf.uni-konstanz.de/dbis/basex/commands#create [2] http://www.inf.uni-konstanz.de/dbis/basex/commands#add

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