BaseX-Talk

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13 participants
5244 discussions

Handling saving errors
by Ramzi Hammouda 06 Jul '20

06 Jul '20

Hello BaseX team, We're developing an application where a command can result in saving data on multiple xml documents in the same database. We're using Rest APIs. Now, We're looking on handling saving errors. For example, if there were an error in saving data on a one document, then the saving of data on other documents must be canceled (even if there were successful updates, they must be canceled). How can this be implemented? Thanks. P Respectons ensemble l'environnement. N'imprimez ce message que si n?cessaire. Let's respect the environment together. Only print this message if necessary.

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OverlappingFileLockException error for BaseX version 9.2.4
by Pham Huu Bang 02 Jul '20

02 Jul '20

Hello, I have a Java web application which relies on BaseX library to mostly read XML files (they are quite big, e.g: 20 MB per file) by XQuery. The XQuery is also quite complicated. It takes ~3 seconds to query. Configuration file .basex: https://pastebin.com/3EH7MJi5 I got the error below when multiple requests are processed in parallel. I wonder how BaseX can work in this case without error like this? Thanks, Version: BaseX 9.2.4 Java: Oracle Corporation, 1.8.0_222 OS: Linux, amd64 Stack Trace: java.nio.channels.OverlappingFileLockException at sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java:255) at sun.nio.ch.SharedFileLockTable.add(FileLockTable.java:152) at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1107) at org.basex.io.random.TableDiskAccess.lock(TableDiskAccess.java:147) at org.basex.io.random.TableDiskAccess.<init>(TableDiskAccess.java:79) at org.basex.data.DiskData.init(DiskData.java:125) at org.basex.data.DiskData.<init>(DiskData.java:84) at org.basex.core.cmd.Open.open(Open.java:99) at org.basex.core.cmd.Open.run(Open.java:48) at org.basex.core.Command.run(Command.java:257) at org.basex.core.Command.execute(Command.java:93) at org.basex.core.Command.execute(Command.java:116)

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RbaseX Client software, reading from a socket
by Ben Engbers 30 Jun '20

30 Jun '20

Hi, I have no idea if it is used by others, but last march my most recent version of my RbaseX library was accepted by CRAN. To my knowledge there are no errors (all tests are passed). The only problem is that performance is bad ;-(. Uploading a file or downloading the result from a query can take several minutes. I can understand why it takes so long. According to the server protocol, the end of a stream is indicated by a terminating 0-byte. And to distinguish a 'regular' 0-byte in a binary stream from the stop-0, 0-bytes (and FF-bytes) are preceded by an extra FF-byte. The only way to deal in R with these FF-byte was to proces each character/byte separately and that takes much time. I am trying to speed up everything by using C++ for all direct read/write operations. But I never have worked with C++ before. And neither do I understand exactly how streams are to be used. According to some posts on internet, when reading from a stream the first 8 bytes are used to pass information on the length of the stream. My question is if this a standard way to pass information on that length? Or is it specific to C++ or Java? Ben

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How to serialize HTML as text
by Emmanuel Chateau 27 Jun '20

27 Jun '20

Hi, I’ve got an XQuery question more than a BaseX question. I need to output a JSON object with HTML content without a parent element. Weird idea I grant you, but required by the people I work with. Working from a map, in the map value, the content should not appear in a parent element. Instead of : ``` map { ‘key' : ‘value’, ‘content’ : <span>this is some <hi>content</hi> etc</span> } ``` I would like to output something like ``` map { ‘key' : ‘value’, ‘content’ : 'this is some <hi>content</hi> etc' } ``` Is there a way to output some HTML content without the parent element in XQuery ? Thanks a lot for your help, Best regards, Emmanuel

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Re: [basex-talk] FW: inline issue
by Christian Grün 26 Jun '20

26 Jun '20

Hi Rob, Glad to you hear you are fine. If you want to ensure that arguments of user-defined functions are not evaluated before the function is evaluated, you should work with function items: let $check := function( $pred as item(), $true as function() as item()*, $false as function() as item()* ) { if ($pred) then $true() else $false() } return $check(true(), true#0, function() { error((), 'false') }) In the specific case you brought up, you can instead call the built-in function util:if: util:if(true(), 'true', error((), 'false')) The third argument will only be considered if the supplied condition fails. Hope this helps, Christian > It has been a while. I hope all is well over there. > Yep, still using BaseX and still loving it. It is a great product. > > However lately I encounter an issue with the %basex:inline annotation ☹ and it is bugging me. > > Consider both snippets [snip1], [snip2]. Both should give the same result. However they don’t and worse a can’t make the second snippet [ snip2] work conform the first snippet{snip1]. > > [snip1]: > ====== > if ( true() ) > then "true" > else error((),"false") > > [snip2]: > ====== > %basex:inline(0) > %basex:lazy > function( $pred > , $true > , $false > ) > { > if ( $pred) > then $true > else $false > } ( true() > , "true" > , error((),"false") > ) > > Can you please have a look at this? > TIA. > Greatings, > Rob Stapper > PS. As I remember this used to work fine. > I remember we had a discussion concerning inlining and laziness on 2015-06-17.

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FW: inline issue
by RobStapper 26 Jun '20

26 Jun '20

Sent from Mail for Windows 10 From: RobStapper Sent: Thursday, June 25, 2020 1:33 PM To: basex-talk(a)mailman.uni-konstanz.de Subject: inline issue Hi Cristian, It has been a while. I hope all is well over there. Yep, still using BaseX and still loving it. It is a great product. However 😉 lately I encounter an issue with the %basex:inline annotation ☹ and it is bugging me. Consider both snippets [snip1], [snip2]. Both should give the same result. However they don’t and worse a can’t make the second snippet [ snip2] work conform the first snippet{snip1]. [snip1]: ====== if ( true() ) then "true" else error((),"false") [snip2]: ====== %basex:inline(0) %basex:lazy function( $pred , $true , $false ) { if ( $pred) then $true else $false } ( true() , "true" , error((),"false") ) Can you please have a look at this? TIA. Greatings, Rob Stapper PS. As I remember this used to work fine. I remember we had a discussion concerning inlining and laziness on 2015-06-17. Sent from Mail for Windows 10 -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

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Websites that use BaseX
by Jonathan Robie 25 Jun '20

25 Jun '20

I have recommended BaseX to some people who are writing an application. The developers, who are more comfortable with SQL, have asked for a list of websites that use BaseX. I imagine they would be happy with other happy customers too, they want to have basic confidence in the tool. So which users should give people confidence that BaseX is the tool for them? They know about my own happy experience with BaseX, they want to know more about other projects. Jonathan

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Websites that use BaseX
by Dieter Zanzinger 24 Jun '20

24 Jun '20

We use BaseX for a inhouse scan- and data-capture solution. Dieter Zanzinger Finanzgericht Muenchen > Am 24.06.2020 um 12:00 schrieb basex-talk-request(a)mailman.uni-konstanz.de: > > Send BaseX-Talk mailing list submissions to > basex-talk(a)mailman.uni-konstanz.de > > To subscribe or unsubscribe via the World Wide Web, visit > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > or, via email, send a message with subject or body 'help' to > basex-talk-request(a)mailman.uni-konstanz.de > > You can reach the person managing the list at > basex-talk-owner(a)mailman.uni-konstanz.de > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of BaseX-Talk digest..." > Today's Topics: > > 1. Websites that use BaseX (Jonathan Robie) > 2. Re: Websites that use BaseX (Chris Yocum) > 3. Re: Websites that use BaseX (Joe Wicentowski) > 4. Re: Websites that use BaseX (Liam R. E. Quin) > 5. Re: Websites that use BaseX (Marco Lettere) > <mime-attachment> > <mime-attachment> > <mime-attachment> > <mime-attachment> > <mime-attachment>

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how to start and configure Jetty?
by Nicholas 22 Jun '20

22 Jun '20

I don't quite understand what it means for Jetty to be "embedded" in or with BaseX, but presumably there's a configuration? I see: |DEBUG =falseDBPATH =/home/nicholas/basex/data LOGPATH =.logs REPOPATH =/home/nicholas/basex/repo LANG =EnglishLANGKEYS =falseFAIRLOCK =falseCACHETIMEOUT =3600#Client/ServerArchitectureHOST =localhost PORT =1984SERVERPORT =1984USER =PASSWORD =SERVERHOST =PROXYHOST =PROXYPORT =0NONPROXYHOSTS =IGNORECERT =falseIGNOREHOSTNAME =falseTIMEOUT =30KEEPALIVE =600PARALLEL =8LOG =trueLOGMSGMAXLEN =1000#HTTP ServicesWEBPATH =/home/nicholas/basex/webapp RESTPATH =RESTXQPATH =PARSERESTXQ =3HTTPLOCAL =falseSTOPPORT =8985AUTHMETHOD =Basic but there's nothing actually at WEBPATH, no directory. Perhaps RESTXQPATH requires configuration? Really, just guessing. See also: https://askubuntu.com/q/1252599/847449 If I installed BaseX with apt, should it also pull in Jetty, then? thanks, Nick |

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trying to rename all node elements from <foo/> to <bar/>
by Nicholas 21 Jun '20

21 Jun '20

Hi, How do I rename all the "record" nodes in a database? I'm trying: for $x in db:open("bccdc_covid19") return return rename node $x//record as "baz" but this gives back Stopped at ., 1/13: [XPDY0002] bc.rename.xq: no context value bound. or [XPST0003] Unexpected end of query: 'rename node $x/...'. depending whether it's run from within the basex console. thanks, Nick

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