BaseX-Talk

basex-talk@mailman.uni-konstanz.de

6 participants
5269 discussions

BaseX 8.6.7
by Christian Grün 21 Sep '17

21 Sep '17

Hi all, As we’ll tackle BaseX 8.7 in the next weeks, we’ve released yet another patch release today [1]. As usual, it contains minor performance tweaks (better typing in FLWOR expressions) and bug fixes (pre-evaluation of fn:tail, GUI XQuery highlighting). Have fun, Christian [1] http://basex.org/download/

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DBA deployed on JBoss (Wildfly)
by Marco Lettere 21 Sep '17

21 Sep '17

Hi all, We created an application web app based on the BaseX .WAR distribution. If we deploy it under tomcat we can access all DBA related functionalities after the login prompt. If we try to do the same under WildFly 10, the application starts without errors but trying to access the DBA pages the browser is just bounced back to the login page. Please check the snippets at [1] and [2] to observe the behaviour reflected in the log files. After arriving to the final page one more request to login?path=databases is received. Is there anyone having experience with running BaseX under Jboss / Wildfly? Thanks a lot, Marco. [1] Tomcat DBA login 18:49:13.754 0:0:0:0:0:0:0:1:55352 admin 302 76.47 ms 18:49:13.754 0:0:0:0:0:0:0:1:55352 admin 200 0.1 ms 18:49:13.756 0:0:0:0:0:0:0:1:55352 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/databases 18:49:13.778 0:0:0:0:0:0:0:1:55352 admin 302 21.5 ms 18:49:13.778 0:0:0:0:0:0:0:1:55352 admin 200 0.08 ms 18:49:13.780 0:0:0:0:0:0:0:1:55352 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/login?path=databases 18:49:13.792 0:0:0:0:0:0:0:1:55352 admin 200 11.91 ms 18:49:13.806 0:0:0:0:0:0:0:1:55352 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/style.css 18:49:13.808 0:0:0:0:0:0:0:1:55353 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/js.js 18:49:13.821 0:0:0:0:0:0:0:1:55352 admin 200 15.94 ms 18:49:13.824 0:0:0:0:0:0:0:1:55353 admin 200 16.12 ms 18:49:13.827 0:0:0:0:0:0:0:1:55352 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/basex.svg 18:49:13.841 0:0:0:0:0:0:0:1:55352 admin 200 14.16 ms 18:49:50.466 0:0:0:0:0:0:0:1:55510 admin REQUEST [POST] http://localhost:8080/mywebapp/dba/login-check 18:49:50.537 0:0:0:0:0:0:0:1:55510 admin INFO DBA user was logged in: admin 18:49:50.537 0:0:0:0:0:0:0:1:55510 admin 302 71.72 ms 18:49:50.537 0:0:0:0:0:0:0:1:55510 admin 200 0.09 ms 18:49:50.540 0:0:0:0:0:0:0:1:55510 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/databases 18:49:50.577 0:0:0:0:0:0:0:1:55510 admin 200 37.53 ms 18:49:50.591 0:0:0:0:0:0:0:1:55510 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/style.css 18:49:50.594 0:0:0:0:0:0:0:1:55511 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/js.js 18:49:50.605 0:0:0:0:0:0:0:1:55510 admin 200 14.41 ms 18:49:50.607 0:0:0:0:0:0:0:1:55511 admin 200 12.49 ms 18:49:50.613 0:0:0:0:0:0:0:1:55511 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/basex.svg 18:49:50.622 0:0:0:0:0:0:0:1:55511 admin 200 9.8 ms [2] Wildfly DBA login 18:57:29.915 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/ 18:57:30.594 127.0.0.1:57601 admin 302 681.49 ms 18:57:30.594 127.0.0.1:57601 admin 200 0.18 ms 18:57:30.599 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/databases 18:57:30.660 127.0.0.1:57601 admin 302 61.28 ms 18:57:30.660 127.0.0.1:57601 admin 200 0.1 ms 18:57:30.663 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/login?path=databases 18:57:30.684 127.0.0.1:57601 admin 200 20.65 ms 18:57:30.699 127.0.0.1:57602 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/js.js 18:57:30.699 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/style.css 18:57:30.718 127.0.0.1:57601 admin 200 19.23 ms 18:57:30.721 127.0.0.1:57602 admin 200 21.71 ms 18:57:30.723 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/basex.svg 18:57:30.745 127.0.0.1:57601 admin 200 22.75 ms 18:57:50.379 127.0.0.1:57601 admin REQUEST [POST] http://localhost:8080/mywebapp/dba/login-check 18:57:50.442 127.0.0.1:57601 admin INFO DBA user was logged in: admin 18:57:50.442 127.0.0.1:57601 admin 302 63.28 ms 18:57:50.442 127.0.0.1:57601 admin 200 0.1 ms 18:57:50.446 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/databases 18:57:50.463 127.0.0.1:57601 admin 302 17.4 ms 18:57:50.463 127.0.0.1:57601 admin 200 0.09 ms 18:57:50.466 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/login?path=databases 18:57:50.476 127.0.0.1:57601 admin 200 10.89 ms 18:57:50.490 127.0.0.1:57602 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/js.js 18:57:50.493 127.0.0.1:57601 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/style.css 18:57:50.502 127.0.0.1:57602 admin 200 11.72 ms 18:57:50.505 127.0.0.1:57601 admin 200 12.17 ms 18:57:50.509 127.0.0.1:57602 admin REQUEST [GET] http://localhost:8080/mywebapp/dba/static/basex.svg 18:57:50.523 127.0.0.1:57602 admin 200 13.51 ms

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Library for BaseX
by Eliúd Santiago Meza y Rivera 20 Sep '17

20 Sep '17

Hi! I've been using BaseX for a while mainly for personal purpose and I have written this library to read and make simple updates for Open Office Open Workbook files (Excel files), I hope someone could find it useful, and all comments are welcome. I leave the link below: https://github.com/eliudmeza/OOXML-Library-XQuery-BaseXdb Regards! -- LSC Eliud Santiago Meza y Rivera

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db:text() vs XPath
by Giuseppe Celano 19 Sep '17

19 Sep '17

I am using BaseX 8.6.4 and I am trying to do a group-by/order-by operation, and I see that two logically equivalent queries perform very differently: one cannot see the end, while the other can (and fast). I can provide further details if necessary, but these are the queries (look at the last line of both, where the difference is): (This does not work:) declare variable $p := db:open("db2")/text/line/text(); (: returns a list of values like ΠΕΡΙ#n-s---mv- :) for $u in db:open("db1")/text/s/t let $a := $u/f/text() (: returns one value like ΠΕΡΙ :) let $b := $u/(a)o/data(.) (: returns one value like n-s---mv- :) group by $k := $a || "#" || $b (: builds a value like ΠΕΡΙ#n-s---mv- :) let $n := count($u) order by $n descending return if ($p = $k) then $k || " " || $n else () (This works:) for $u in db:open("db1")/text/s/t let $a := $u/f/text() (: returns one value like ΠΕΡΙ :) let $b := $u/(a)o/data(.) (: returns one value like n-s---mv- :) group by $k := $a || "#" || $b (: builds a value like ΠΕΡΙ#n-s---mv- :) let $n := count($u) order by $n descending return if (db:text("db2", $k)) then $k || " " || $n else () The problem is with directly accessing the database with db:text() or indirectly using XPATH. I would tend to use XPATH and expect to get an underlying translation into db:text(), but this seems not to happen: why? Best, Giuseppe

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java.lang.NoClassDefFoundError: Could not initialize class java.nio.file.FileSystems$DefaultFileSystemHolder
by Liam R. E. Quin 18 Sep '17

18 Sep '17

It seems with the latest Java 1.8 - java-1.8.0-openjdk-headless-1.8.0.144-0.b01.el7_4.x86_64 on Centos 7, I can no longer drop a database, any ideas? This is with both 8.5.3 and 8.6.6, and also with the latest snapshot, BaseX867-20170824.195627.zip [[ $ bin/basexclient -p 1994 Username: admin Password: BaseX 8.6.6 [Client] Try 'help' to get more information. > open rdf Database 'rdf' was opened in 1.61 ms. > close Database 'rdf' was closed. > drop db rdf Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.5.3 Java: Oracle Corporation, 1.8.0_131 OS: Linux, amd64 Stack Trace: java.lang.NoClassDefFoundError: Could not initialize class java.nio.file.FileSystems$DefaultFileSystemHolder at java.nio.file.FileSystems.getDefault(FileSystems.java:176) at java.nio.file.Paths.get(Paths.java:84) at org.basex.io.IOFile.toPath(IOFile.java:335) at org.basex.io.IOFile.delete(IOFile.java:243) at org.basex.io.IOFile.delete(IOFile.java:240) at org.basex.core.cmd.DropDB.drop(DropDB.java:77) at org.basex.core.cmd.DropDB.run(DropDB.java:46) at org.basex.core.Command.run(Command.java:253) at org.basex.core.Command.execute(Command.java:99) at org.basex.server.ClientListener.run(ClientListener.java:136) > open rdf Database 'rdf' was opened in 1.56 ms. > xquery count(//image) 7370 Query executed in 68.2 ms. ]] -- Liam Quin, W3C, http://www.w3.org/People/Quin/ Staff contact for Verifiable Claims WG, XQuery WG Web slave for http://www.fromoldbooks.org/

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SQL2XML
by iCloud 18 Sep '17

18 Sep '17

Hello, I wrote a small app for my own needs to convert any kind of MS-SQL tables to a XML file. Feel free to download it, use it, distribute it. FREE OF CHARGE ! Still be a BETA for the moment !! Thanks for your feedback This is the download area : https://rink.hockeyapp.net/apps/71fcf4452594429d8cf81e5f2569e8e8 Have fun Michel

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A few general questions about BaseX
by Anastasiou A. 18 Sep '17

18 Sep '17

Hello everyone I am trying to load BaseX with a large number of XML files (~500), each one a few hundreds of MBs big. BaseX fails with a message along the lines "This is too big for one database". Can I please ask: 1) Are there any logs, beyond the DB logs? If yes, where can I find them? a. The reason I am asking is because once basexgui gives the message, there is no indication about the error. Ideally, I would like to know if this is a limitation on memory amount or number of items (?). 2) The parser options include reading XML files from archives, which is very convenient, but once the file has been parsed, does BaseX require the "originals" for queries / returning results? 3) Is it possible to do federation with BaseX? In other words, let's say I split a database in two large parts (as per #1), is it possible to launch two baseX servers and then have them talk to each other so that ultimately I just query one of them and get back unified results? All the best

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retrieving the name of the archive?
by Graydon Saunders 18 Sep '17

18 Sep '17

Hello -- BaseX will happily consume zip archives; this is just splendid for loading up a bunch of docx files. Now I find myself wanting the name of the docx file -- the original name of the archive -- and I don't know how to retrieve that. (or if it can be!) But I think it must be there somewhere because db:path repeats the standard OOXML file paths: [Content_Types].xml word/document.xml word/footnotes.xml word/footer1.xml word/endnotes.xml word/theme/theme1.xml word/settings.xml docProps/custom.xml customXml/itemProps2.xml docProps/app.xml customXml/item2.xml customXml/itemProps1.xml word/fontTable.xml customXml/item1.xml customXml/item3.xml customXml/itemProps3.xml customXml/item4.xml customXml/itemProps4.xml word/numbering.xml word/styles.xml word/webSettings.xml docProps/core.xml word/people.xml over and over; if they were all going to exactly that there'd be one copy, and all several hundred docx files are there by content. (db:list-details tells me about > 4000 individual xml files.) If I can get the name of the original archive, how do I do that? Thanks! Graydon

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Basex Inner Workings
by Anastasiou A. 18 Sep '17

18 Sep '17

Hello everyone Quick question: Is there any document / URL where I could find out more about how does Basex access the disk during its operation? For example, are there any reads to be expected during executing a query? Through iotop, I can see 3-4 processes reading during startup, then another 2, very briefly firing when opening the database and then during querying there are periodic writes (?) but of very brief duration. I was wondering if there is anything that could be done from the point of view of the hardware to speed up queries (?) (except a more powerful machine at the moment) All the best Athanasios Anastasiou

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Is there any documentation on the narrow limits of XQuery index optimization in BaseX?
by Omar Siam 18 Sep '17

18 Sep '17

Hi list! Recently I started to wonder why functions in my XQuery modules make no use of indexes unless I force them to by using the respective function like db:text(). Now I just did some I think minimal changes to the example for text index at: http://docs.basex.org/wiki/Indexes#Text_Index. If I just change it like below I loose almost all index optimization. The only optimizations left are: * Using db:open or collection with a string but not one in a variable of a for FLOWR expression or the simple map operator. * Using xquery:eval and passing a context with db:open or collection Is there any chance that this will change any time soon? Is this a fundamental restriction? Best regards Omar xquery version "3.1"; declare namespace _ = "urn:local:namespace:_"; import module namespace functx = "http://www.functx.com"; declare function _:_1st_example($ctx as document-node()) { $ctx//*[text() = 'Germany'] }; declare function _:_2nd_example($file as xs:string) { doc($file)//name[. = 'Germany'] }; declare function _:_3rd_example($dbname as xs:string+) { ( for $c in ($dbname!collection(.))//country where $c//city/name = 'Hanoi' return $c/name, $dbname!xquery:eval("//*[text() = 'Vietnam']", map {'': db:open(.)})) }; ( (: 1st example :) _:_1st_example(.), (: 2nd example :) _:_2nd_example('factbook.xml'), (: 3rd example :) _:_3rd_example(('factbook', 'factbook')), xs:string(_:_1st_example) ) Optimized Query: (let $ctx_314 := . return $ctx_314/descendant::*[(text() = "Germany")], db:open-pre("factbook",0)/descendant::name[(. = "Germany")], (for $c_317 in (("factbook", "factbook") ! collection(.))/descendant::country[(descendant::city/name = "Hanoi")] return $c_317/name, (("factbook", "factbook") ! xquery:eval("//*[text() = 'Vietnam']", map { "":db:open(.) }))), _:_1st_example cast as xs:string?) Compiling: [...] - RUNTIME: pre-evaluate root() to document-node() - RUNTIME: rewrite descendant-or-self step(s) - RUNTIME: apply text index for "Vietnam" - RUNTIME: pre-evaluate root() to document-node() - RUNTIME: rewrite descendant-or-self step(s) - RUNTIME: apply text index for "Vietnam"

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