BaseX-Talk March 2013

basex-talk@mailman.uni-konstanz.de

38 participants
59 discussions

Error in 7.6 !! but not in 7.5
by John Best 14 Mar '13

14 Mar '13

Hi there, for $x in (db:fulltext('work', 'string theory')/ancestor::*:Doc except db:fulltext('work', 'elastic')/ancestor::*:Doc) return substring(data($x/Publish/PubDate/@d), 7) I am storing Dates in YYYYMMDD Format as <PubDate d="20040608"> tag. The above query will return the Date of the Document published for the searched criteria. Using the BaseX 7.5, I was able to run the query correctly. But with 7.6, I am getting error *"Single item expected, ("20040608", "20040609") found"* -- Have a nice day JBest

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Re: [basex-talk] Bugreport: org.basex.server.ClientQuery.cache(ClientQuery.java:81)
by Bodo Hüsemann 13 Mar '13

13 Mar '13

Hi all, I apologize for the german post on this english mailinglist...So here we go in english: I have recently migrated my BaseX application from version 7.2 to 7.6 (and 7.6.1 Beta). The BaseX lib throws exceptions while running concurrent XQuery queries and updates (based on a threadpool), see the exceptions attached below (the specific numeric error-code changes slightly but the error occurs every time on the same line of code). The error itself seems to happen unter heavy concurrency (sequential queries have no problem) and not every time query executes. The application code is as follows (class de.infabswissarmy.control.XMLDBManagerBaseX.query): public ArrayList<String> query(String inQuery, String[][] inArgs){ ClientSession mySession = null; ClientQuery myQuery = null; ArrayList<String> tmpString = new ArrayList<String>(); try { mySession = getClientSession(); myQuery = mySession.query(inQuery); // bind variable if (inArgs != null){ for (int i=0; i < inArgs.length; i++){ myQuery.bind("$" + inArgs[i][0], inArgs[i][1]); } } while (myQuery.more()){ // **exception is in this line ** tmpString.add(myQuery.next()); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (myQuery != null){ try { myQuery.close(); } catch (BaseXException e) { // ignore } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return tmpString; } To be complete this is the used helper function: private static ClientSession getClientSession() throws IOException { ClientSession mySession = new ClientSession("localhost", 1984, "admin", "admin"); return mySession; } Version 7.2 is running without problems. In version 7.6 I have seen some rare Java heap space errors at the same location, and once I even saw a massive growth of the DB > 1GB (normal size would be 1MB), but this may be another error and I cannot reproduce it. I will try to deliver a selfcontained min-example, but this could be quite an effort to do (it will take some time to produce it). So I hope that you might find the problem with the delivered information. Many thanks once again for this great XML-DB and thanks in advance for your help! Bodo -- attached error stack with version 7.6.1 (in 7.6 the error occurs in row 79 instead of 81) org.basex.core.BaseXException: -146032 at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) org.basex.core.BaseXException: 0 at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) org.basex.core.BaseXException: java.lang.ArrayIndexOutOfBoundsException at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

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index usage while processing large xml file(s)
by EV Narasimham 13 Mar '13

13 Mar '13

Hi, I'm currently processing a 3GB xml file. Below is the Query that is being executed and the corresponding output count(db:open("ASEPXML", "A_SEPXML")/descendant::*:PmtInf[15]/*:CdtTrfTxInf/*:CdtrAgt/*:FinInstnId/*:BIC/text()) Output: 100000 The total time taken to evaluate the query is 210 secs. Below is the query plan. Compiling: - pre-evaluating db:open("ASEPXML", "A_SEPXML") Optimized Query: fn:count(document-node { "A_SEPXML" }/descendant::*:PmtInf[15]/*:CdtTrfTxInf/*:CdtrAgt/*:FinInstnId/*:BIC/text()) Result: - Hit(s): 1 Item - Updated: 0 Items - Printed: 6 Bytes - Locking: local [ASEPXML] Timing: - Parsing: 0.0 ms - Compiling: 0.28 ms - Evaluating: 210818.96 ms - Printing: 0.08 ms - Total Time: 210819.34 ms Query plan: <QueryPlan> <FNAggr name="count(item)"> <CachedPath> <DBNode name="ASEPXML" pre="0"/> <IterPosStep axis="descendant" test="*:PmtInf"> <Pos min="15" max="15"/> </IterPosStep> <IterStep axis="child" test="*:CdtTrfTxInf"/> <IterStep axis="child" test="*:CdtrAgt"/> <IterStep axis="child" test="*:FinInstnId"/> <IterStep axis="child" test="*:BIC"/> <IterStep axis="child" test="text()"/> </CachedPath> </FNAggr> </QueryPlan> The database ASEPXML has text index created. The structure of the xml is as follows: <root> <PmtInf> <CdtTrfTxInf> <CdtrAgt> <FinInstnId> <BIC>XXXXXX1A</BIC> </FinInstnId> </CdtrAgt> </CdtTrfTxInf> <CdtTrfTxInf> <CdtrAgt> <FinInstnId> <BIC>XXXXXX2A</BIC> </FinInstnId> </CdtrAgt> </CdtTrfTxInf> <CdtTrfTxInf> <CdtrAgt> <FinInstnId> <BIC>XXXXXX3A</BIC> </FinInstnId> </CdtrAgt> </CdtTrfTxInf> <CdtTrfTxInf> ... repeating node (100000) </PmtInf> <PmtInf> </PmtInf> ... repeating node (40) </root> Are there possibilities of reducing the response times and how do I detect if an index is being used or not ? Regards Nesh

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Make-Up Brushes
by sales32＠injoybeauty.NET 12 Mar '13

12 Mar '13

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Java Client - Error BXDB0006 while accessing a single document
by Carlos MARCOS LAGUNAR 11 Mar '13

11 Mar '13

Hello. I've just installed last version of BaseX and have built a Java Client to access it. This is my code: String query = "insert node <patient>EOEO</patient> into fn:doc(\"MG_USERS/58745896522DFEF.xml\")/vmr" ClientSession cSes = new ClientSession(URL, PORT, USER, PASS); ClientQuery cQuery = cSes.query(query); String res = cQuery.execute(); cQuery.close(); And I'm getting this error: [BXDB0006] Database path 'MG_USERS/58745896522DFEF.xml' must point to a single document. I'm pretty sure that there is only ONE document there, since I always execute a DELETE MG_USERS/58745896522DFEF.xml prior of that code you see above. Furthermore, just before executing that code, I check it with a REST call via Internet Explorer and I get just one doc. So I don't really understand why I get the BXDB0006 error. If I try the same but with the REST interface instead of Java Client, by using: <rest:query xmlns:rest=\"http://basex.org/rest\"> <rest:text> insert node <patient>EOEO</patient> into fn:doc(\"MG_USERS/58745896522DFEF.xml\")/vmr </rest:text> I get the same error. Could anybody help me with this, please?. Thank you and best regards, C. Carlos Marcos Lagunar Health Technical Consultant Research & Innovation carlos.marcos(a)atosresearch.eu <mailto:carlos.marcos@atosresearch.eu> Valladolid - Spain www.atosresearch.eu <http://www.atosresearch.eu/> es.atos.net ------------------------------------------------------------------ This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Atos group liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted. Este mensaje y los ficheros adjuntos pueden contener informacion confidencial destinada solamente a la(s) persona(s) mencionadas anteriormente pueden estar protegidos por secreto profesional. Si usted recibe este correo electronico por error, gracias por informar inmediatamente al remitente y destruir el mensaje. Al no estar asegurada la integridad de este mensaje sobre la red, Atos no se hace responsable por su contenido. Su contenido no constituye ningun compromiso para el grupo Atos, salvo ratificacion escrita por ambas partes. Aunque se esfuerza al maximo por mantener su red libre de virus, el emisor no puede garantizar nada al respecto y no sera responsable de cualesquiera danos que puedan resultar de una transmision de virus. ------------------------------------------------------------------

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BaseX Server
by zanzinger＠alice-dsl.de 11 Mar '13

11 Mar '13

Dear Sirs, I am coming from the "content-side" of xml, therefore please excuse the maybe simple questions. (I did a lot xml, xslt, now xquery; a lot vba; a little objective C and C - but not much client-cerver-things). I am trying out BaseX-features. This is, what I´ve done so far: - Installation (Mac-Version) was easy. - Creating a Database via the GUI was easy. - Testing XQuery in the GUI was easy as well. - Now I tried the server: First I started the server with the Gui-Menu-Commands: it works. Fine: I can access the Server by the Command-Line of the Gui, e.g. get an answer to the command "list" or get the answer on a "xQuery …" . The Problem is now: I am searching an easy tutorial or explanation, how I can access the Server from a Browser (e.g. Safari), or for example from a loaded webpage in the browser, which has appropriate xml-/xquery/javascript-code to access the database (how do I write that cods?). I already tried to connect to the server via Mac-webDAV: does not work, whereas from the Gui, I can connect to the server. In the Browser, I tried "http://localhost:1984/rest" :no response. Is there any easy tutorial, how jetty interacts with baseX-server? Are there books on how to set up the client-server architecture of baseX? Where (which directory) has a static html-page to be placed, which I can call via localhost? (That seemed to me the first simple step to access the server.) The next logical step would be to route the http:// - request to the database-server?! As far as I understand, this is done by the various APIs, e.g. php or node.js? Hope, you understand my needs... I am very interested in baseX as the results so far seem very promising to me. Thanks in advance for an answer (English or German). Dieter Zanzinger München zanzinger(a)alice-dsl.de

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Re: [basex-talk] Debugger for Xuery
by John Best 10 Mar '13

10 Mar '13

Hi, These link might help you - http://www.oxygenxml.com/xml_editor/xquery_debugger.html http://www.w3.org/TR/xpath-functions/#func-trace -- Have a nice day JBest

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Debugger for Xuery
by bhupesh patel 10 Mar '13

10 Mar '13

Hello All, I am looking for any free/paid version of debugger for XQuery while using BaseX server. Can anyone point me to any resources you guys know of? Thanks, Bhupesh

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BaseX 7.7 Beta
by Christian Grün 08 Mar '13

08 Mar '13

Dear all, we are very busy right now, finalizing Version 7.7 of BaseX. This is what you can expect from the upcoming release: – full XQuery 3.0 support, including enhanced (generalized) FLWOR expressions... http://docs.basex.org/wiki/XQuery_3.0 – a new XQUnit Module, which facilitates testing of complex XQuery applications: http://docs.basex.org/wiki/XQUnit_Module – improved concurrency control on database level: http://docs.basex.org/wiki/Transaction_Management You are invited to download the latest stable snapshot: http://files.basex.org/releases/latest/ Big thanks to our team member Leo for internalizing all the intricacies of XQuery 3.0, and providing a great implementation! And thank you all for letting BaseX grow and flourish, both as contributors, developers and users. Your feedback is welcome, Christian BaseX Team, 2013

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Bugreport: org.basex.server.ClientQuery.cache(ClientQuery.java:81)
by Bodo Hüsemann 08 Mar '13

08 Mar '13

Moin zusammen, ich habe meine Base-X Applikation von Version 7.2 auf 7.6 und versuchsweise auf 7.6.1 (Beta) umgestellt (embedded Base-X Server). Hierbei wirft die BaseX Lib bei parallelen XQuery Anfragen bei gleichzeitigen Inserts (ich verwende einen Threadpool) reproduzierbar die unten angehängte Fehlermeldung (in Variationen auch mit anderen Fehlercodes, aber immer an der gleichen Stelle/Zeile und beim gleichen Aufruf). Der Fehler tritt nicht bei jeder Anfrage auf (es scheint also eine bestimmte Concurrency Situation vorzuliegen). Die betreffende Funktion im Applikationscode ist wie folgt: public ArrayList<String> query(String inQuery, String[][] inArgs){ ClientSession mySession = null; ClientQuery myQuery = null; ArrayList<String> tmpString = new ArrayList<String>(); try { mySession = getClientSession(); myQuery = mySession.query(inQuery); // bind variable if (inArgs != null){ for (int i=0; i < inArgs.length; i++){ myQuery.bind("$" + inArgs[i][0], inArgs[i][1]); } } while (myQuery.more()){ // ** hier wird die Exception geworfen ** tmpString.add(myQuery.next()); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (myQuery != null){ try { myQuery.close(); } catch (BaseXException e) { // ignore } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return tmpString; } Hier noch getClientSession: private static ClientSession getClientSession() throws IOException { ClientSession mySession = new ClientSession("localhost", 1984, "admin", "admin"); return mySession; } In der Version 7.2 war noch alles ok. Wahlweise habe ich auch schon Java-Heap Space Fehler an gleicher Stelle bekommen. Und in einem Fall ist die Datenbank plötzlich auf über 1GB angewachsen (vielleicht ein anderes Problem). Bevor ich anfange hierzu einen Minimalcase zu produzieren (was vermutlich recht aufwändig werden wird, da der Fehler nur unter Lastbedingungen auftritt) liefere ich vorab schon mal diesen Fehlerbericht. Vielleicht fällt ja direkt ein Problem ins Auge.... Wie immer vielen Dank für diese Klasse XML-DB und viele Grüße, Bodo -- Anhang Fehlermeldungen mit Version 7.6.1 (in 7.6 war die Zeilennr: 79) org.basex.core.BaseXException: -146032 at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) org.basex.core.BaseXException: 0 at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) org.basex.core.BaseXException: java.lang.ArrayIndexOutOfBoundsException at org.basex.server.ClientQuery.cache(ClientQuery.java:81) at org.basex.server.Query.more(Query.java:74) at de.infabswissarmy.control.XMLDBManagerBaseX.query(XMLDBManagerBaseX.java:86) at de.infabswissarmy.control.XMLDBManagerBaseX.queryDoc(XMLDBManagerBaseX.java: 121) at de.infabswissarmy.control.QueryTask.httpQuery(QueryTask.java:180) at de.infabswissarmy.control.QueryTask.run(QueryTask.java:271) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

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BaseX-Talk March 2013