- BaseX-Talk - mailman.uni-konstanz.de

correction function to retrieve images and .class files
by Wang, Yvonne 08 Jul '16

08 Jul '16

Hi, We are using bin:decode-string(db:retrieve to retrieve binary file such as text and json files. However, it does not work for images and .class files. Any suggestion on the correction functions to use to retrieve images and .class files? Thanks Yvonne

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Seeing this error a lot lately (since 8.5-snapshots)
by Marc van Grootel 07 Jul '16

07 Jul '16

Hi, With the 8.5 branch i've started seeing the following error a lot lately. [XUDY0016] Documents in path 'docbook/chapters/mu.xml' can only be replaced once. This is the example function I used to trigger this. declare %updating function local:import() { for $file in file:list($srcdir, true(), '*.xml') let $path := $srcdir || $file where not(file:is-dir($path)) return db:replace('docbook', $file, doc(trace($path,'X: '))) }; (lifted from the BaseX documentation example on file:list) Note that the path exists and contains several XML files. It happened a lot too on a work project so I've seen this in several situations now. On the latter project it went away after going back to a 8.4 build. Sorry for not reporting sooner as I was under severe time pressure at the time. I tried switching MIXUPDATES on and off. That doesn't make a difference. I have two XML files in this $srcdir and when I put a trace around $path I see that both of them are listed before it stops with an error message that includes the path of the first one. X: "/Users/marcvangrootel/projects/xml/book/chapters/mu.xml" X: "/Users/marcvangrootel/projects/xml/book/chapters/test.xml" Stopped at /Users/marcvangrootel/projects/xml/c4/test/demo.xq, 30/20: [XUDY0016] Documents in path 'docbook/chapters/mu.xml' can only be replaced once. Odd! --Marc

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German Article about BaseX at informatik-aktuell.de
by Maximilian Gärber 07 Jul '16

07 Jul '16

Hi, for our german readers this might be another helpful high-level intro to BaseX http://www.informatik-aktuell.de/betrieb/datenbanken/nosql-basex-eine-xml-d… Regards, Max

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ArrayIndexOutOfBoundsException withe BaseX version 8.5
by Simon Chatelain 07 Jul '16

07 Jul '16

Hello, I just updated BaseX to the last version (8.5), and I am now facing some issues, while with the previous version (8.4.4) my application was working flawlessly. My application receive XML documents from a TCP socket and store them in BaseX, in parallel and upon user request the same collection is queried. For both adding new documents and querying the collection, I am using a LocalSession, each one in its own thread. The problem is that the following exception occurs very often, and when it happens, it seems to corrupt definitely the DB. I wrote 2 simple test cases. The ArrayExceptionTest.java exhibits the problem while NoArrayExceptionTest.java does not. The only difference between the 2 is: · ArrayExceptionTest.java uses LocalSession for adding documents to and querying the collection · NoArrayExceptionTest.java uses LocalSession only for querying the collection, adding documents in the collection is done by using directly the Context. org.basex.core.BaseXException: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.5 Java: Oracle Corporation, 1.7.0_80 OS: Windows 7, x86 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: 2147483647 at org.basex.io.random.TableDiskAccess.fpre(TableDiskAccess.java:501) at org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:452) at org.basex.io.random.TableDiskAccess.read2(TableDiskAccess.java:155) at org.basex.data.Data.nameId(Data.java:360) at org.basex.data.Data.name(Data.java:375) at org.basex.query.value.node.DBNode.name(DBNode.java:169) at org.basex.query.expr.path.NameTest.eq(NameTest.java:92) at org.basex.query.func.db.DbAccess$1.next(DbAccess.java:67) at org.basex.query.func.db.DbAccess$1.next(DbAccess.java:62) at org.basex.query.iter.Iter.value(Iter.java:53) at org.basex.query.expr.ParseExpr.value(ParseExpr.java:68) at org.basex.query.QueryContext.value(QueryContext.java:417) at org.basex.query.expr.path.CachedPath.nodeIter(CachedPath.java:36) at org.basex.query.expr.path.AxisPath.iter(AxisPath.java:78) at org.basex.query.expr.path.AxisPath.iter(AxisPath.java:51) at org.basex.query.expr.gflwor.For$1.next(For.java:109) at org.basex.query.expr.gflwor.OrderBy$1.sort(OrderBy.java:76) at org.basex.query.expr.gflwor.OrderBy$1.next(OrderBy.java:57) at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:96) at org.basex.query.func.fn.FnCount.item(FnCount.java:27) at org.basex.query.expr.ParseExpr.iter(ParseExpr.java:44) at org.basex.query.MainModule.iter(MainModule.java:118) at org.basex.query.QueryContext.iter(QueryContext.java:340) at org.basex.query.QueryProcessor.iter(QueryProcessor.java:91) at org.basex.core.cmd.AQuery.query(AQuery.java:94) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:253) at org.basex.core.Command.execute(Command.java:99) at org.basex.api.client.LocalSession.execute(LocalSession.java:132) at org.basex.api.client.Session.execute(Session.java:36) at basextest.ArrayExceptionTest$1.run(ArrayExceptionTest.java:57) at org.basex.core.Command.execute(Command.java:100) at org.basex.api.client.LocalSession.execute(LocalSession.java:132) at org.basex.api.client.Session.execute(Session.java:36) at basextest.ArrayExceptionTest$1.run(ArrayExceptionTest.java:57) Regards Simon

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Collation in BaseX and Java
by Kristian Kankainen 06 Jul '16

06 Jul '16

Hello! In a lexicographic application I need a custom collation for ordering. The documentation for XML, Xquery and XSLT all somehow state that system available collations are to be used and all seem to support custom collations by specifying the URI. Is this possible also for custom created Java collators? I have been looking at the Java docs [1] and it looks easy enough for me, but I would like to get an affirmative from this list that it does work with BaseX. My initial guesses is that I'd need to package my collator class as a jar and install it in the Xquery module repository [2]. But how to use it from there I'm not sure. Is BaseX able to automatically use it correctly if I specify the correct URI as collation in the prolog "|declare| |default| |collation 'URI';|"? I'd me more than glad to write about it in the documentation/wiki if I get it working. Cheers! Kristian [1] http://docs.oracle.com/javase/7/docs/api/java/text/RuleBasedCollator.html [2] http://docs.basex.org/wiki/Repository

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BaseX 8.5: The Summer Edition
by Christian Grün 05 Jul '16

05 Jul '16

Dear all, A new Summer Edition of BaseX is available! Our XML database system and XQuery 3.1 processor provides the following new stunning features: DATABASE JOBS - all registered database jobs are now centrally administered - jobs can be scheduled (periodical execution, start/end time) - job results can be cached and retrieved later on - new Jobs Module: XQuery functions for managing jobs - new commands: JOBS [LIST|RESULT|STOP] - DBA: visualization of currently registered jobs XQUERY - parallel execution via xquery:fork-join (thank you, James Wright!) - alignments with the latest changes in the XQuery 3.1 specification - easy chaining of update operations with the 'update' keyword - numerous optimizations, smarter rewritings and heuristics XQUERY MODULES - File, Conversion, Fetch Module: handling of invalid XML characters - Inspection Module: inspect:function-annotations added OPTIONS - LOGPATH: custom path for logging data - CACHETIMEOUT: timeout for dropping cached job results - AUTHMETHOD: `custom` added to skip authentication Visit http://basex.org to find the latest release, and check out http://docs.basex.org/ to get more information. Have fun, Christian BaseX Team

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Remote IP access or configuration tweak?
by Chris Speare 05 Jul '16

05 Jul '16

I have BaseX installed and running happily on my desktop and trying to connect from java on my laptop to port 1984 (unchanged). Using the web interface (http://192.168.17.28:8984/dba/login) works happily enough, however I just get "connect timed out" when using the java API. I can't see anything in the config that indicate I need to "enable" remote access (unlike MySQL which only binds to localhost initially), so I was expecting this to just "work out the box". Am I missing something obvious? The information contained in the email and any files transmitted with it is confidential and intended for the addressee only. If you have received this email in error please accept our apologies and notify the originator. Any disclosure, copying, distribution or any other use of this communication is strictly prohibited and may be unlawful. We reserve the right to monitor and intercept communications for lawful business purposes. Wireless Innovation Ltd , Unit D2, Churcham Business Park, Churcham, Gloucestershire, GL2 8AX, Great Britain. Company Registration Number 5240202, Place of Registration Companies House Cardiff.

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Rounding Issue
by prasad gavhane 04 Jul '16

04 Jul '16

Hi, I am using BaseX 8.4.3. I found some discriminating results while executing following query in two different ways : Query : round(((( $V1 * $V2 )+( $V3 * $V4 )+( $V5 * $V6 ))div( $V1 + $V3 + $V5 ))*10000) div 10000 1. Type 1 (standalone values) let $V1 := 1500000000 let $V2 := 0.0926 let $V3 := 1000000000 let $V4 := 0.082 let $V5 := 500000000 let $V6 := 0.0931 let $V7 := 0.0892 return round(((( $V1 * $V2 )+( $V3 * $V4 )+( $V5 * $V6 ))div( $V1 + $V3 + $V5 ))*10000) div 10000 Output : 0.0892 2 : Type 2 (values from input xml attached in this mail - val.xml) let $V1 := data/V1 let $V2 := data/V2 let $V3 := data/V3 let $V4 := data/V4 let $V5 := data/V5 let $V6 := data/V6 let $V7 := data/V7 return round(((( $V1 * $V2 )+( $V3 * $V4 )+( $V5 * $V6 ))div( $V1 + $V3 + $V5 ))*10000) div 10000 Output : 0.0891 Is this a bug or am I doing something wrong? Thanks, Prasad Gavhane.

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XQuery questions
by meumapple 01 Jul '16

01 Jul '16

Does anyone knows why () != (1) evaluates to false? And why substring("aas", 1, 2) instance of function(*) evaluates to false? Thanks! Joseph

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Starting multiple sessions in BaseX with Perl: compilation failed at Carp.pm
by Bram Vanroy | KU Leuven 30 Jun '16

30 Jun '16

Hi there BaseX people! Original post on StackOverflow: http://stackoverflow.com/questions/38086358/starting-multiple-sessions-in-ba sex-with-perl-compilation-failed-at-carp-pm I wanted to see if I could start multiple BaseX sessions (on a single server) to try some things out, but I can't even get the sessions to launch - heck, I can't even get the Perl script to compile! This is odd to me, because the same code works perfectly without multiple sessions. Let's say I have a subroutine that creates sessions given an amount. E.g. the following code would create 3 sessions (variables for dbhost, user and password left out): CreateSessions(3); # For testing my $session = $sessions[0]; sub CreateSessions { my ($amountofsessions) = @_; our @sessions = (); for (my $i = 0; $i < $amountofsessions; $i++) { my $session = Session->new($dbhost, 1950, $usr, $pw); push(@sessions, $session); } } I also tried other approaches, e.g. creating each session individually and assigning it to a variable, and then building an array with these variables. The same problem occurs: Compilation failed in require at /usr/share/perl5/Carp.pm line 33. When I look up that file and that line, it states: eval { require Carp::Heavy }; Which, I guess, means that I don't have the Carp module installed? But I do not understand why I would need this, and why that the Perl script works when I only create one session. Is it possible to launch multiple sessions from Perl that can work simultaneously, and if so, how do you launch these sessions and access them? It's important to note that in PHP, for another project but the same database, having multiple sessions does work. In other words, there I can have multiple sessions that run in parallel. We're on BaseX 7.9 and Perl 5.10.1. (Old, I know, but I can't change it.) Thank you for your time! Bram

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