BaseX-Talk July 2010

basex-talk@mailman.uni-konstanz.de

26 participants
48 discussions

Feature Requests
by Swaminathan S 06 Jul '10

06 Jul '10

Hi Christian, Please find below my feature requests: 1) Support constraints (xsd validation and user defined constraints (like support for database triggers)) 2) Transaction support - a rollback feature 3) CData declarations to be retained Thanks Swaminathan Sahiram

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BaseX embedded
by Charles F. Munat 06 Jul '10

06 Jul '10

I'm working on a Maven web project and I'd like to use BaseX in embedded mode to store XML and XHTML documents. I've experimented with other databases in embedded mode, and generally I include a jar (hopefully via Maven, though not always), then I can use the API to create a session, create databases, collections, and documents, run queries, etc. I found the well-hidden Maven configuration to add Maven to the pom.xml file, but I am having a hard time finding any documentation or examples that show me how to use the API. The examples I have found use sockets to connect to a running instance of the database server. This is not what I had in mind. Is it the only way to use BaseX, or am I missing a more direct way? Thanks for clarification... Chas.

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Reminder about your invitation from sayali Kulkarni
by sayali Kulkarni (LinkedIn Invitations) 06 Jul '10

06 Jul '10

LinkedIn ------------ This is a reminder that on June 21, sayali Kulkarni sent you an invitation to become part of his or her professional network at LinkedIn. Follow this link to accept sayali Kulkarni's invitation. https://www.linkedin.com/e/87foxj-gbacdcas-1u/doi/1401339739/ZCnLLJ4a/gir_8… Signing up is free and takes less than a minute. On June 21, sayali Kulkarni wrote: > To: [basex-talk(a)mailman.uni-konstanz.de] > From: sayali Kulkarni [sayalikulkarni7(a)gmail.com] > Subject: sayali Kulkarni wants to stay in touch on LinkedIn > > I'd like to add you to my professional network on LinkedIn. > > - sayali Kulkarni The only way to get access to sayali Kulkarni's professional network on LinkedIn is through the following link: https://www.linkedin.com/e/87foxj-gbacdcas-1u/doi/1401339739/ZCnLLJ4a/gir_8… You can remove yourself from sayali Kulkarni's network at any time. -------------- ------ (c) 2010, LinkedIn Corporation

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Feature Requests?
by Christian Grün 05 Jul '10

05 Jul '10

Hi everyone, thanks for your continuous and diligent feedback on BaseX and its development. As we are currently rescheduling priorities for new features, we invite you to give us a summary, or list, of the features you'd want to have integrated most desperately in BaseX. There is always enough to do anyway. Don't hesitate to get visionary, or greedy, though; the more serious input we get, the better we'll be able to serve everyone's needs in future. All the best, Christian ___________________________ Christian Grün University of Konstanz Department of Computer & Information Science D-78457 Konstanz, Germany Tel: +49-7531-88-4449, Fax: +49-7531-88-3577 http://www.inf.uni-konstanz.de/~gruen

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Passing java objects as XQuery parameters using XQJ
by Stefano Santoro 03 Jul '10

03 Jul '10

Hi, I am having trouble binding a java object to an XQuery external variable. Here is my simple java class: public class Provami { private int items; private String name; public Provami() { } public Provami(String name, int items) { this.items = items; this.name = name; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public int getItems() { return this.items; } public void setItems( int items) { this.items = items; } } and here is my XQuery sample declare namespace provami = "java:Provami"; declare variable $bar as xs:anyAtomicType external; let $foo := provami:new() return element a { element i {provami:setName($foo, 'nome'), provami:getName($foo)}, element i {provami:getName($bar)} } I have tried two approaches with XQJ: 1) to create an atomic type groovy:000> otype = conn.createAtomicType(XQItemType.XQBASETYPE_ANYATOMICTYPE, new QName("java:Provami"),null) groovy:000> ixpr.bindObject(new QName("bar"), new Provami("passato", 4), otype) ERROR org.basex.api.xqj.BXQException: No mapping known for 'Provami'. at org.basex.api.xqj.BXQAbstract.create (BXQAbstract.java:128) at org.basex.api.xqj.BXQDynamicContext.bindObject (BXQDynamicContext.java:147) at groovysh_evaluate.run (groovysh_evaluate:13) ... 2) I have also tried to create an item groovy:000> itm = conn.createItemFromObject(new Provami('roba',4), null) ERROR org.basex.api.xqj.BXQException: No mapping known for 'Provami'. at org.basex.api.xqj.BXQAbstract.create (BXQAbstract.java:128) at org.basex.api.xqj.BXQDataFactory.createItemFromObject (BXQDataFactory.java:231) at org.basex.api.xqj.BXQDataFactory.createItemFromObject (BXQDataFactory.java:39) at groovysh_evaluate.run (groovysh_evaluate:13) ... Could you please advice on how I may successfully bind the parameter. Thanks Stefano

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Re: [basex-talk] Newbie questions
by Andreas Weiler 02 Jul '10

02 Jul '10

Dear Nigel, > 1. Where is the main body of BaseX documentation? Our homepage (docs & publications), the mailing list, and the source code all serve as documentation; due to lack ofresources, we can't offer you more. > 2. I can’t see a service on my machine called “BaseX”. What’s doing > the server-side work? I’m using Windows 7. You have to start the BaseXServer in a console and then you can talk to it with your client. A service functionality which runs in the background of windows isnt available yet. > 3. The PHP example does this... $cmd = "xquery 1 to 10" which it sends > to the sever and gets a result. As far as I know that’s not a normal > valid xquery command yet it returns a result ok. I would expect $cmd = > "1 to 10" to work ok but not $cmd = "xquery 1 to 10". Do all queries > to BaseX using the PHP API have to start with the string “xquery “, > followed by the xquery itself? You have to send the "xquery" keyword to the server for identify the correct command you want to execute. There are a lot of commands additional to "xquery" (see http://www.inf.uni-konstanz.de/dbis/basex/commands). If you use the QueryIteratorExample you can just send the query itself, like 1 to 10, cause here you can only execute queries and no other commands. > 4. Where’s the documentation for the PHP API so I can find the answer > to the above question myself? There is a readme file (https://svn.uni-konstanz.de/dbis/basex/trunk/api/etc/) and the code files it self are documented. > 5. Is there a web-based forum for BaseX? There is just this mailing-list, but your questions will be answered really fast. I hope this helps, dont hesitate to ask for more. Kind regards, Andreas Nigel Alderton schrieb: > > Hi, I’m a BaseX newbie struggling with the basic “Hello world” type > stuff and struggling to find documentation to answer my questions... > > 1. Where is the main body of BaseX documentation? > > 2. I can’t see a service on my machine called “BaseX”. What’s doing > the server-side work? I’m using Windows 7. > > 3. The PHP example does this... $cmd = "xquery 1 to 10" which it sends > to the sever and gets a result. As far as I know that’s not a normal > valid xquery command yet it returns a result ok. I would expect $cmd = > "1 to 10" to work ok but not $cmd = "xquery 1 to 10". Do all queries > to BaseX using the PHP API have to start with the string “xquery “, > followed by the xquery itself? > > 4. Where’s the documentation for the PHP API so I can find the answer > to the above question myself? > > 5. Is there a web-based forum for BaseX? > > Thanks > > Nigel > > ------------------------------------------------------------------------ > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

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Newbie questions
by Nigel Alderton 01 Jul '10

01 Jul '10

Hi, I'm a BaseX newbie struggling with the basic "Hello world" type stuff and struggling to find documentation to answer my questions... 1. Where is the main body of BaseX documentation? 2. I can't see a service on my machine called "BaseX". What's doing the server-side work? I'm using Windows 7. 3. The PHP example does this... $cmd = "xquery 1 to 10" which it sends to the sever and gets a result. As far as I know that's not a normal valid xquery command yet it returns a result ok. I would expect $cmd = "1 to 10" to work ok but not $cmd = "xquery 1 to 10". Do all queries to BaseX using the PHP API have to start with the string "xquery ", followed by the xquery itself? 4. Where's the documentation for the PHP API so I can find the answer to the above question myself? 5. Is there a web-based forum for BaseX? Thanks Nigel

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Re: [basex-talk] Abstürze basex/DeepFS bei vielen Dateien
by Christian Grün 01 Jul '10

01 Jul '10

Hallo Markus, im aktuellen DeepFS-Code kenne ich mich nicht bis ins Detail aus. Ich leite Deine Mail mal an Bastian L. und Alex weiter; vielleicht haben sie ein paar Ideen? Grüße, Christian ___________________________ 2010/6/17 Markus Roth <markus.roth(a)uni-konstanz.de>: > Hallo Christian, > > ich bin derzeit ein wenig am Rumspielen mit DeepFS und es tritt > kontinuierlich ein Fehler auf (immer zum gleichen Zeitpunkt): too many open > files. > Wenn ich das Limit für offene file handles hochsetze per ulimit -n (standard > in der bash sind 1024), dann kommt der Fehler später, aber trotzdem. > Siehe dazu weiter unten. > Warum sollte baseX aber so viele offene file handles haben? Mit dem > Lesen/Schreiben zusammen sollten es ja nicht so arg viele sein. Oder werden > u.U. (da die Traversierungs-Fkt. wohl rekursiv sein dürfte) je nach Tiefe > des aktuellen Pfades die Ascendants offen gelassen? Da der Fehler in der > Konsole mehrfach ausgegeben wird bis zum Abbruch: gibt es mehrere parallele > "crawler"/Indexer? > Inwiefern die Volltext-Indexierung bzw. inkludieren der Textdaten Einfluß > hat habe ich noch nicht betrachtet (also die folgenden Daten/Fehler sind mit > den Standardvoreinstellungen von DeepFS OHNE Volltext-Indexierung und > Inklusion von Text entstanden). > > > Gruß, > Markus > > > Linux (CentOS 5.4 final) || basex 6.1 & 6.1.5 -> too many open files > ca. 115k Dateien > XML-Nodes: ulimit: > 1,74Mio 1024 > 1,75Mio 2048 > 1,77Mio 4096 > 1,91Mio 16384 > 3,38Mio 200000 > > Windows XP SP3 hatte mit ca. 73k Dateien keine Probleme (konnte auch nicht > rausfinden wie hoch da das OFH ist) > > > Auszug aus der Fehlermeldung: > > java.io.FileNotFoundException: /root/BaseXData/DeepFS/tbli.basex (Too many > open files) > at java.io.FileOutputStream.open(Native Method) > at java.io.FileOutputStream.<init>(FileOutputStream.java:209) > at java.io.FileOutputStream.<init>(FileOutputStream.java:160) > at org.basex.io.DataOutput.<init>(DataOutput.java:49) > at org.basex.io.DataOutput.<init>(DataOutput.java:38) > at org.basex.io.TableDiskAccess.flush(TableDiskAccess.java:77) > at org.basex.data.DiskData.flush(DiskData.java:122) > at org.basex.data.DiskData.cls(DiskData.java:134) > at org.basex.data.Data.close(Data.java:128) > at org.basex.core.proc.Close.close(Close.java:46) > at org.basex.core.proc.Close.run(Close.java:29) > at org.basex.core.Proc.run(Proc.java:139) > at org.basex.core.Proc.run(Proc.java:163) > at org.basex.core.proc.Open.run(Open.java:30) > at org.basex.core.Proc.run(Proc.java:139) > at org.basex.core.Proc.run(Proc.java:163) > at org.basex.core.proc.CreateFS.run(CreateFS.java:54) > at org.basex.core.Proc.run(Proc.java:139) > at org.basex.core.Proc.exec(Proc.java:109) > at org.basex.core.Proc.exec(Proc.java:123) > at org.basex.gui.GUICommands$49.run(GUICommands.java:931) > /root/.basexwin could not be written. > >

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BaseX-Talk July 2010