BaseX-Talk

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6 participants
5269 discussions

BaseX XML interface
by NewIntellectual 24 Jul '10

24 Jul '10

Godmar Back asks: I'm still curious what XML interface I'm missing. While I agree that published interfaces should work properly, I think a simple point is being completely missed. Both XML and XQuery are, by their nature, human readable text, regardless of their complexity. That means that queries can be sent simply as text strings, and results of any size can also be returned in that way and then parsed as XML fragments in any number of myriad ways, including parsing to an in-memory DOM. I successfully use this approach to query an XML database representing close to 200,000 pages of text and to retrieve pretty large XML fragments (actually documents with a single root element) quickly. This may be a simple approach but there is no loss of generality by using it - in other words, using a more complex interface will not let you do some XQuery processing that cannot be done with this approach. You can use the following code to access BaseX for example (in this case to a local server using default permissions). I am prefixing text to make the result string an XML document but your code may not need it: package [...]; import java.io.*; import java.util.*; import org.basex.server.ClientSession; public class QueryText { public String doQuery(String xquery) { ClientSession session; String result; ByteArrayOutputStream buffer = new ByteArrayOutputStream(); session=null; result="NO RESULT"; try { session = new ClientSession("localhost", 1984, "admin", "admin"); session.execute(xquery, buffer); result="<?xml version='1.0' encoding='UTF-8'?>"+buffer.toString("UTF-8"); } catch(Exception e) { ... } finally { try { session.close(); } catch(Exception e) { ... } } } }

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Addendum to last post
by NewIntellectual 23 Jul '10

23 Jul '10

The code I posted accidentally omitted a critical step - add a 'return result;' as the last statement in the doQuery method.

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working with XML databases (BaseX) in Java
by Godmar Back 23 Jul '10

23 Jul '10

Hi, I'd like to follow up for the benefit of the list on this comment by Christian: > As mentioned, our DOM interfaces haven't been tested very much, but > your focus on DOM and XQJ might inspire other users to play around > with this interface as well, and give us more feedback. Could people share their approaches to working with XML in Java? My (apparently outdated) knowledge is that only two approaches are in wide use: those that use an in-memory representation of an XML document (or fragment) - e.g., either XOM, org.w3c.'s DOM, JDOM, etc. or approaches that use a stream-based approach (SAX). Naively, I would have expected that XML databases such as BaseX would provide excellent support for at least one of the widely used DOM interfaces. (In fact, Christian made an earlier comment that BaseX uses an "optimized" (albeit incomplete) implementation of org.w3c.'s DOM classes.) Are there other existing approaches besides DOM that would allow me to retrieve and update XML documents, and represent portions of them in memory? - Godmar

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Re: [basex-talk] How to start BaseX server windows from the command line?
by Andreas Weiler 16 Jul '10

16 Jul '10

Hi Nigel, > 2. Is there a way I can close the command prompt window but leave BaseX > server running as a process in the background? there is no option in windows like the nohup option in linux which puts the commands in background. So you have to create a service with the basex startup on your machine and start this. Another way is to start it like this: start /B java -cp basex.jar org.basex.BaseXServer this will let you get back to the command line (with enter). But when you close the console the server is closed too. Another way is to install cygwin (http://www.cygwin.com/) and run it like on a linux machine: nohup java -cp basex.jar org.basex.BaseXServer & Kind regards, Andreas Nigel Alderton schrieb: > Thanks very much. That worked. > > But unfortunately it doesn't return to the command line prompt, and if I > manually close the command window, the BaseX server stops. > > 1. Is this behaviour intentional? > 2. Is there a way I can close the command prompt window but leave BaseX > server running as a process in the background? > > Thanks again. Sorry to bother you with such newbie questions! > > Nigel > > -----Original Message----- > From: Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] > Sent: 16 July 2010 11:48 > To: Nigel Alderton > Cc: basex-talk > Subject: Re: [basex-talk] How to start BaseX server windows from the command > line? > > Dear Nigel, > > yes you need to download the basex.jar file. > Then you have to execute: java -cp BaseX61.jar org.basex.BaseXServer > > See for more information: http://www.inf.uni-konstanz.de/dbis/basex/server > > I hope this helps. > > Kind regards, > Andreas > > Nigel Alderton schrieb: > >> Thanks Andreas, I tried that but an error appeared: >> >> C:\Program Files\BaseX>java -cp basex.jar org.basex.BaseXServer >> Exception in thread "main" java.lang.NoClassDefFoundError: >> org/basex/BaseXServer >> Caused by: java.lang.ClassNotFoundException: org.basex.BaseXServer >> at java.net.URLClassLoader$1.run(Unknown Source) >> at java.security.AccessController.doPrivileged(Native Method) >> at java.net.URLClassLoader.findClass(Unknown Source) >> at java.lang.ClassLoader.loadClass(Unknown Source) >> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) >> at java.lang.ClassLoader.loadClass(Unknown Source) >> Could not find the main class: org.basex.BaseXServer. Program will exit. >> >> I only have one file: BaseX.exe in c:\program files\BaseX. Do I need to >> download basex.jar to get the standalone server version of BaseX? >> >> Is there any online documentation regarding configuring an running BaseX >> > on > >> windows? >> >> Nigel >> >> -----Original Message----- >> From: Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] >> Sent: 16 July 2010 11:32 >> To: Nigel Alderton >> Cc: basex-talk(a)mailman.uni-konstanz.de >> Subject: Re: [basex-talk] How to start BaseX server windows from the >> > command > >> line? >> >> Dear Nigel, >> >> just start it with: java -cp basex.jar org.basex.BaseXServer >> >> Kind regards, >> Andreas >> >> Nigel Alderton schrieb: >> >> >>> Hi, >>> >>> How can I start the windows version of the BaseX server from the >>> command line ie. **without** using the client user interface File - >>> Server Administration - Start? >>> >>> I want to configure BaseX server to start when my PC starts? Can this >>> be done, if so how? >>> >>> I have BaseX Version 6.1. >>> >>> 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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Re: [basex-talk] How to start BaseX server windows from the command line?
by Andreas Weiler 16 Jul '10

16 Jul '10

Dear Nigel, yes you need to download the basex.jar file. Then you have to execute: java -cp BaseX61.jar org.basex.BaseXServer See for more information: http://www.inf.uni-konstanz.de/dbis/basex/server I hope this helps. Kind regards, Andreas Nigel Alderton schrieb: > Thanks Andreas, I tried that but an error appeared: > > C:\Program Files\BaseX>java -cp basex.jar org.basex.BaseXServer > Exception in thread "main" java.lang.NoClassDefFoundError: > org/basex/BaseXServer > Caused by: java.lang.ClassNotFoundException: org.basex.BaseXServer > at java.net.URLClassLoader$1.run(Unknown Source) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > Could not find the main class: org.basex.BaseXServer. Program will exit. > > I only have one file: BaseX.exe in c:\program files\BaseX. Do I need to > download basex.jar to get the standalone server version of BaseX? > > Is there any online documentation regarding configuring an running BaseX on > windows? > > Nigel > > -----Original Message----- > From: Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] > Sent: 16 July 2010 11:32 > To: Nigel Alderton > Cc: basex-talk(a)mailman.uni-konstanz.de > Subject: Re: [basex-talk] How to start BaseX server windows from the command > line? > > Dear Nigel, > > just start it with: java -cp basex.jar org.basex.BaseXServer > > Kind regards, > Andreas > > Nigel Alderton schrieb: > >> Hi, >> >> How can I start the windows version of the BaseX server from the >> command line ie. **without** using the client user interface File - >> Server Administration - Start? >> >> I want to configure BaseX server to start when my PC starts? Can this >> be done, if so how? >> >> I have BaseX Version 6.1. >> >> 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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Re: [basex-talk] How to start BaseX server windows from the command line?
by Andreas Weiler 16 Jul '10

16 Jul '10

Dear Nigel, just start it with: java -cp basex.jar org.basex.BaseXServer Kind regards, Andreas Nigel Alderton schrieb: > > Hi, > > How can I start the windows version of the BaseX server from the > command line ie. **without** using the client user interface File – > Server Administration – Start? > > I want to configure BaseX server to start when my PC starts? Can this > be done, if so how? > > I have BaseX Version 6.1. > > 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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How to start BaseX server windows from the command line?
by Nigel Alderton 16 Jul '10

16 Jul '10

Hi, How can I start the windows version of the BaseX server from the command line ie. *without* using the client user interface File - Server Administration - Start? I want to configure BaseX server to start when my PC starts? Can this be done, if so how? I have BaseX Version 6.1. Thanks, Nigel

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Results scoring/ranking
by Maciej 15 Jul '10

15 Jul '10

Hello, I have a collection of XML documents formated with respected to a pre-defined stable schema (WSDLs---Web service definitions). I need to execute (from PHP) search over XML documents. I wonder whether xBase: (1) scores relevance of whole matching XML documents and ranks them (in any way) ? (2) allows to identify (in matching document) XML elements with matched query terms and than navigate to parental/children nodes in XML structure ? (3) provides a way to give more weight to some XML element types during relevance scoring ? Best regards, Maciej

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Results ranking
by mgawinecki＠gmail.com 15 Jul '10

15 Jul '10

I have a collection of XML documents formated with respected to a pre-defined stable schema (WSDLs---Web service definitions). I need to execute (from PHP) search over XML documents. I wonder whether xBase: (1) scores relevance of whole matching XML documents and ranks them (in any way) ? (2) allows to identify (in matching document) XML elements with matched query terms and than navigating to parental/children nodes in XML structure ? (3) provides a way to give more weight to some XML element types during relevance scoring ? Best regards, Maciej

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Feature Request
by Andy Chambers 14 Jul '10

14 Jul '10

Hi Christian, A while ago, you were soliciting feature requests so here's mine :-) It would be nice if there was some way to perform XSLT transforms on the results of a query. I'd be happy to implement this if you gave me a few pointers about where you think it would fit in the best. My guess would be to make a XSLT filter and attach it to the OutputStream that is passed to Proc.exec. I'm not sure about how to decide when to apply which stylesheets so I'm open to suggestions here. From a user point of view, I think it would be nice to have a "style" parameter on the REST interface that allows one to specify a stylesheet. Cheers, Andy

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