BaseX-Talk November 2013

basex-talk@mailman.uni-konstanz.de

38 participants
54 discussions

JSON or JSONML output formatting
by Zachary Pride 16 Jul '14

16 Jul '14

Hello, I've been playing with BaseX lately and all-in-all am very impressed. Something I'm wrestling with however is the JSON output options. I've got various web applications that would really be simplified by receiving JSON straight away for the obvious scripting benefits. The JSON method has been giving me a lot of grief, stipulating rules I'm not sure how to follow. right now I have an element that "is typed as string and cannot be nested." I've been able to get JSONML to output but the JSON is this morass of nested Arrays... Attributes seem to get transformed into Objects but elements/tags and their values are pushed into Arrays for some rationale - which I suppose is on purpose. My question is how can I get Objects for simple key:value properties from <tag>value</tag> 's. Are there options I'm not utilizing? Would it be feasible to transform the XML output to some middle form first - setting it up to become Objects, before serializing it to JSON? Thanks! Zach Pride Associate Software Engineer Ultra Electronics, ProLogic 1000 Green River Drive, Ste. 201 Fairmont, WV 26554 zachary.pride(a)ultra-prologic.com Tel: +1 304 333 2680 ext.308 www.ultra-prologic.com This e-mail from Ultra Electronics, ProLogic and any attachments to it are confidential to the intended recipient and may also be privileged or controlled by U.S. export control laws and regulations. No technical data, information or other items provided by Ultra Electronics, ProLogic in connection with this email shall be shared or provided to any foreign persons, entities, or subsidiaries without the expressed written authorization of Ultra Electronic, ProLogic. If you have received it in error please notify the sender and delete it from your system. If you are not the intended recipient you must not copy it or use it for any purpose nor disclose or distribute its contents to any other person. All communications may be subject to interception or monitoring for operational and/or security purposes. Please rely on your own virus checking as the sender cannot accept any liability for any damage arising from any bug or virus infection. This e-mail from Ultra Electronics, ProLogic and any attachments to it are confidential to the intended recipient and may also be privileged or controlled by U.S. export control laws and regulations. No technical data, information or other items provided by Ultra Electronics, ProLogic in connection with this email shall be shared or provided to any foreign persons, entities, or subsidiaries without the expressed written authorization of Ultra Electronic, ProLogic. If you have received it in error please notify the sender and delete it from your system. If you are not the intended recipient you must not copy it or use it for any purpose nor disclose or distribute its contents to any other person. All communications may be subject to interception or monitoring for operational and/or security purposes. Please rely on your own virus checking as the sender cannot accept any liability for any damage arising from any bug or virus infection. Please consider the environment before printing this email.

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Dynamic Module Loading
by Jean-philippe Magué 19 May '14

19 May '14

Hello, Exist-db has an util:import-module<http://exist-db.org/exist/apps/fundocs/view.html?uri=http://exist-db.org/xq…>function that allows to dynamically import an XQuery module at run time. I haven't found anything equivalent in BaseX. Is that right ? I have also tried to see how to implement such a function directly in Java, but as far as I understand the module parsing process, functions prefix are checked at compile time. That would compromise any attempt to write such a function. Am I right ? Best, Jean-Philippe -- Jean-Philippe Magué Maître de Conférences en Humanités Numériques Responsable de l'Atelier des Humanités Numériques : ahn.ens-lyon.fr Ecole Normale Supérieure de Lyon +33 (0)4 26 23 38 08 -- "Using computers will therefore lead us to a more profound and systematic knowledge of human expression; in principle, it can help us to be more humanistic than before." Busa, 1980.

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query function like matches can't work fast as = op , how to optimizer it? how to create range index?
by easy 11 Jan '14

11 Jan '14

hi,all, I found the @attribute='value' operation will fast after create attribute index, but function like matches,contains,starts-with has no effect even after create text index. how to optimum it , how to create path index, range index? thanks. -- 此致 easy 莫愁前路无知己，天下谁人不识君。

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map:module. Behavior of maps of nodes
by jean-marc Mercier 23 Dec '13

23 Dec '13

Hello, The following query map:size(map:new(({<dummy>dummy</dummy>:""},{<doudou>dummy</doudou>:""}))) returns ..1. Does it means that the map module uses the function fn:data() to compute keys for nodes ?? Cheers Jean-Marc

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strange behaviour of the BaseXgui-editor
by Rob Stapper 14 Dec '13

14 Dec '13

Hi, I encountered a few (3) problems with the BasexGui-editor. I use the 7.8 beta release but the issue's also occur in previous versions. Problem 1: this is a minor problem but maybe related to problem 2 which is ( for me) a major problem: If I open two ( small) packages of which one has no errors and one has errors then the errorstatus-message at the bottom of the editor doesn't synchronize correctly when switching files. If I switch from the incorrect packagefile to the correct packagefile the errormessage doesn't refresh to 'ok' until I edit this file. Even after closing an activated incorrect packagefile the errormessage stays active. Clicking on the message even reopens the incorrect packagefile. Switching the focus from the correct packagefile to the incorrect packagefile however, doesn't show this behavior. In that case the errorstatus-message changes to the appropriate errormessage of the incorrect file. Problem 2: which is a major problem when working with big files ( 80 kB) I found that when editing a large(r) packagefile the Basexgui-editor doesn't recognize errors that occur after a certain point in the file. If errors occur after this point the errorstatus-message shows 'ok' but I know that the file contains errors and if I try to install the file as a package I get an window with the message below. If the error occurs before that certain point then I get an correct errormessage. However if I delete the code which contains the error the error-message remains. Clicking on the message brings the cursor to the point where the deleted code with the error used to be, even after saving and closing the file. Errormessage ============================================================================ ============================================== Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.8 beta Java: Oracle Corporation, 1.7.0_45 OS: Windows Vista, x86 Stack Trace: java.lang.NullPointerException at org.basex.query.func.StaticFuncs.check(StaticFuncs.java:121) at org.basex.query.QueryParser.finish(QueryParser.java:312) at org.basex.query.QueryParser.parseLibrary(QueryParser.java:253) at org.basex.query.QueryContext.parseLibrary(QueryContext.java:197) at org.basex.query.util.pkg.RepoManager.installXQ(RepoManager.java:230) at org.basex.query.util.pkg.RepoManager.install(RepoManager.java:70) at org.basex.core.cmd.RepoInstall.run(RepoInstall.java:37) at org.basex.core.Command.run(Command.java:344) at org.basex.core.Command.exec(Command.java:320) at org.basex.core.Command.execute(Command.java:77) at org.basex.core.Command.execute(Command.java:89) at org.basex.gui.dialog.DialogProgress$1.run(DialogProgress.java:178) ============================================================================ ============================================== Being a responsible Basex-user I does what it says and give you some feedback J Problem 3: This is an old issue that I addressed e few months ago but which you could not reproduce. I found a new clue which might help you solving this issue. The issue was when working in fullscreen mode (F11) in the BasexGUI and then saving a file with 'save as .' The save-messagebox gets the focus but disappears behind fullscreen basexgui-window. This has something to do with using a dual monitorsystem. On a single monitor system it works ok: The save-box is placed on top of the fullscreen Basexgui-window and gets the focus. On a dualmonitorsystem the save-box is placed behind the fullscreen Basexgui-window and gets the focus. I hope this insight helps you tackle this minor issue. Well, that's all folk. I hope you can solve the editor-problem soon because I have a really hard time debugging my (large(r)) programs. Regards, Rob Stapper

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Is there a better way to do develop or test with c/s mode server?
by easy 13 Dec '13

13 Dec '13

Hi, all I found the Gui can only work with local mode, but I want do some xquery test / sandbox with basex server, only found can do in client mode, Is there some other way ?esp for restful web mode. thanks -- 此致 easy 莫愁前路无知己，天下谁人不识君。

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user.dir and BaseX Add Command
by Simon Görke 03 Dec '13

03 Dec '13

Hi together, I have a question regarding the baseX add command. We change the user.dir system property in the basexserver.bat as shown below: java -Duser.dir=c:/tmp -cp "%CP%" %VM% org.basex.BaseXServer %* This is done with the background of defining an export/import directory without using absolute paths with the add command itself (we deploy our setup from version control to different directory environments, and it should work "out-of-the-box"). 1. With exporting, this seems to work fine except for a minor issue: in addition to the successful export to c:\tmp, an empty folder is created in the basex/bin directory with the name of the exported db. 2. With adding, we always get the error message " Resource "C:/tmp/test.xml" not found.", even if test.xml exists in the filesystem at c:\tmp. However, if we copy test.xml to the basex/bin-folder, the add command is successful. It seems that though the error message relates to the correct (modified) path, baseX uses the default one when trying to add the file? Would it be possible to fix this issue, or is there another way to achieve the intended behavior? Best Regards Simon

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Decoupling custom code with restxq
by Wiemer, Sebastian 02 Dec '13

02 Dec '13

3 6

Perf issue
by jean-marc Mercier 01 Dec '13

01 Dec '13

Hello, I am encountering a performance issue with BaseX interpreter, illustrated by the snippet code above. This code first creates a sequence of 100000 integers, taking more than a minute with my environment. Then it creates a BaseX map of 100000 integers, taking 0.1 sec. This issue seems to be due to a poor performance of the operator () (see function local:id below). This could be an issue for the BaseX interpreter, or a problem with my environment, but might be also a XQUERY 3.0 "leak". Have you any idea ? cheers Jean-Marc declare function local:id($el) as function() as item()* {function(){ $el }}; declare function local:new() {local:id(())}; declare function local:new($map,$item) {local:id(($map(),$item))}; let $nb := 100000 return let $testid := fn:fold-left(for $i in 1 to $nb return $i,local:new(), function($map,$entry){local:new( $map,$entry )}) let $basexmap := fn:fold-left(for $i in 1 to $nb return map:entry($i,$i),map:entry(0,0), function($entry,$map){map:new( ($map,$entry) )}) return (fn:count(prof:time( $testid )),fn:count(prof:time( $basexmap )))

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default element namespace and restxq
by sechel＠math.tu-berlin.de 29 Nov '13

29 Nov '13

Hi, I'm experiencing problems using a default element namespace in a restxq module. Here is a working example taken from the default restxq module. All I addded is the namespace of the response element. module namespace page = 'http://basex.org/modules/web-page'; declare namespace test = 'http://test-namespace.org'; declare %rest:path("/ajax/hello/{$world}") %rest:GET function page:hello($world as xs:string) as element(test:response) { <test:response> <test:title>Hello { $world }!</test:title> <test:time>The current time is: { current-time() }</test:time> </test:response> }; If I now introduce a default element namespace just to simplify notation, I get a NullPointerException module namespace page = 'http://basex.org/modules/web-page'; declare default element namespace 'http://test-namespace.org'; declare %rest:path("/ajax/hello/{$world}") %rest:GET function page:hello($world as xs:string) as element(response) { <response> <title>Hello { $world }!</title> <time>The current time is: { current-time() }</time> </response> }; java.lang.NullPointerException at org.basex.query.expr.Arr.has(Arr.java:46) at org.basex.query.func.StaticFuncCall.has(StaticFuncCall.java:137) at org.basex.query.QueryContext.mainModule(QueryContext.java:203) at org.basex.http.restxq.RestXqResponse.create(RestXqResponse.java:66) at org.basex.http.restxq.RestXqModule.process(RestXqModule.java:108) at org.basex.http.restxq.RestXqFunction.process(RestXqFunction.java:100) at org.basex.http.restxq.RestXqServlet.run(RestXqServlet.java:31) at org.basex.http.BaseXServlet.service(BaseXServlet.java:58) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) Best regards Stefan -- Stefan Sechelmann DFG-Forschungszentrum Matheon Mathematik für Schlüsseltechnologien Technische Universität Berlin Sekretariat MA 8-3 Tel. 030/314 29 486 Straße des 17. Juni 136 Fax 030/314 79 282 10623 Berlin sechel(a)math.tu-berlin.de http://www.math.tu-berlin.de/~sechel

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BaseX-Talk November 2013