BaseX-Talk November 2016

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20 participants
24 discussions

Preparing BaseX 8.5.4 (please don't forget Issue #1341)
by Jan Dölle 20 Feb '18

20 Feb '18

Hi, we noticed you prepare release 8.5.4. Please don't forget to fix issue: SQL with BaseX 8.5.3 #1341 Thx Jan -- Jan Dölle E-Mail: basex-list(a)id1.de Telefon +49-69-244502-0 Home: www.id1.de Information Design One AG, Baseler Straße 10, 60329 Frankfurt am Main Registereintrag: Amtsgericht Frankfurt am Main, HRB 52596 Vorstand: Robert Peters, Aufsichtsrat: Christian Hecht (Vorsitz)

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standalone vs GUI character parsing
by Bridger Dyson-Smith 13 Jun '17

13 Jun '17

Hi all - I'm able to create a database with the GUI from an XML document that contains an invalid character (U+0000) -- I guess BaseX does some character scrubbing, which is awesome :). When I try creating a database with the same input XML document from the commandline (using the basex executable), I get an error message. Here are my commands in standalone mode: BaseX 8.5.3 [Standalone] Try 'help' to get more information. > create db test-bad-char /usr/home/bridger/src/another-test.xml "/usr/home/bridger/src/another-test.xml" (Line 4): An invalid XML character (Unicode: 0xb) was found in the element content of the document. > xquery db:create("test-bad-char", "/usr/home/bridger/src/another-test.xml", "/usr/home/bridger/src/", map { "chop": false() }) Stopped at ., 1/10: [FODC0002] "/usr/home/bridger/src/another-test.xml" (Line 4): An invalid XML character (Unicode: 0xb) was found in the element content of the document. > This isn't a surprise (I'm more surprised (pleasantly) by the GUI behavior); is there a way to apply the same "scrubbing" from the GUI in standalone mode? I'm sure there is, but I'm not able to figure out which option to apply. As always, thank you for your time and trouble, and thanks for BaseX. Best, Bridger

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C# Client - Updating query
by Chris Speare 29 Nov '16

29 Nov '16

Hi all, Trying to use the C# client available from https://github.com/BaseXdb/basex/tree/master/basex-api/src/main/c%23 to perform an update query, however I must be missing the obvious - query runs and no exceptions are raised, however the XML remains un-changed. Code snippet (as this is held on a different machine): String base_update_query = @"xquery version '3.0'; let $invoice := db:open('{0}')/CommercialDocument[Customer/@id={1}] return replace value of node $invoice/InvoiceNumber with '{2}'"; .... Session session = new Session("localhost", 1984, "admin", "my_pass"); Query q = session.Query( String.Format( base_update_query, String.Concat("billing_run_", billing_run_id), customer_id, invoice_number ) ); .... >From the BaseX logs I then see entries: QUERY[1] xquery version '3.0'; let $invoice := db:open('billing_run_506')/CommercialDocument[Customer/@id=437] return replace value of node $invoice/InvoiceNumber with '28443' so I know the query reached the server, and the response seems to be "not error" as no exception is being raised - however the XML document hasn't been updated. Yet if I run the same query in either the client or web client it works (document updates) - provided I switch the query to "updating" not read-only. Is there a flag I've missed, or is .Query of Session the wrong method to use Kind regards Chris Speare 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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XQuerry Help on Collections
by Mike Maul 29 Nov '16

29 Nov '16

I'm struggling a bit with XQuery especially in terms of collections. How would one take q query like for $x in doc('src/main/resources/xml/input.xml')//li return data($x) and apply it to a database with a collection of documents? What I'm after is something like: for $x in doc(*)//li return data($x) Also how are namespaces referenced/specified in queries? Finally if anyone as any good XQuery resources would appreciate if if you could pass them along...

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No namespace for multiple commands in POST?
by Arjan Loeffen 27 Nov '16

27 Nov '16

I'm trying to REST POST a sequence of commands in accordance with http://docs.basex.org/wiki/Commands#XML_Syntax I get the error response: *cvc-elt.1: Cannot find the declaration of element 'commands'.* Is there a namespace for <commands> wrapper element? I'd expect it to be http://basex.org/rest but the same message is returned on the qualified name: *cvc-elt.1: Cannot find the declaration of element 'basex:commands'.* Using Basex 8.5.3 Thanks in advance, -- Arjan Loeffen, Armatiek BV 06-12918997

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docker images broken?
by Maximilian Gärber 25 Nov '16

25 Nov '16

Hi, I tried the image on a new server and I get: basex_1 | Creating /srv/BaseXWeb/WEB-INF/web.xml basex_1 | java.nio.file.NoSuchFileException: /srv/BaseXWeb/WEB-INF/web.xml basex_1 | at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86) is the image broken? Regards, Max

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Large text files
by Tim Thompson 25 Nov '16

25 Nov '16

Hello, I have a large file[1] (3.5G unzipped) in the n-triples RDF format that I would like to work with in BaseX. When I try to read in the file using file:read-text(), I get the following error: Error: Version: BaseX 8.6 beta 8fa97ca Java: Oracle Corporation, 1.8.0_73 OS: Linux, amd64 Stack Trace: java.lang.NegativeArraySizeException at java.util.Arrays.copyOf(Arrays.java:3236) at org.basex.util.TokenBuilder.addByte(TokenBuilder.java:247) at org.basex.util.TokenBuilder.add(TokenBuilder.java:176) at org.basex.io.in.TextInput.cache(TextInput.java:143) at org.basex.io.in.TextInput.content(TextInput.java:132) at org.basex.query.value.item.StrStream.materialize(StrStream.java:71) at org.basex.query.value.item.StrStream.string(StrStream.java:44) at org.basex.query.expr.ParseExpr.toToken(ParseExpr.java:273) at org.basex.query.expr.ParseExpr.toEmptyToken(ParseExpr.java:261) at org.basex.query.func.fn.FnSubstring.item(FnSubstring.java:22) at org.basex.query.expr.ParseExpr.iter(ParseExpr.java:44) at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:99) at org.basex.query.scope.MainModule$1.next(MainModule.java:122) at org.basex.query.QueryContext.cache(QueryContext.java:648) at org.basex.query.QueryProcessor.cache(QueryProcessor.java:116) at org.basex.core.cmd.AQuery.query(AQuery.java:87) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:255) at org.basex.core.Command.execute(Command.java:93) at org.basex.gui.GUI.exec(GUI.java:479) at org.basex.gui.GUI.access$3(GUI.java:433) at org.basex.gui.GUI$7.run(GUI.java:421) When I try to create a text database using the GUI, I get an error stating that the file could not be parsed. Is it possible to work with text files that are this large using BaseX? Thank you, Tim [1] Available for download here: http://www.bne.es/es/Inicio/Perfiles/Bibliotecarios/DatosEnlazados/Descarga… (http://datos.bne.es/datadumps/autoridades.nt.bz2) -- Tim A. Thompson Metadata Librarian (Spanish/Portuguese Specialty) Princeton University Library

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Re: [basex-talk] questions webfrontend icw BaseX-queryserver bachend
by Christian Grün 25 Nov '16

25 Nov '16

Hi Rob (cc to the list), > Thanx fort the quick reply. It sure helps but the db:output suggestion is not doing what I have in mind. > > - rest versus restxq. In that case I'll use the rest namespace. > - so it is a matter of choice. "Separation of concerns" would be my guideline in this. > - Yep, I want to return the save data to the client as a confirmation of the data that has been stored. This data is also enriched with f.e. an unique code. My problem with "db:output" is that the argument of the function is evaluated before the pending updates have been processed and I would like this evaluation take place on the updated data, like some kind of "reread"-functionality. I could not make this work with db:output. Am I overlooking something here? You are completely right, it is not possible to access the result of an update within the same query (because the pending updates will always be executed after query evaluation). This is what can be done instead: • You can use db:output(web:redirect(...)) to call another RESTXQ function that will generate the user feedback. This pattern is a good one for web applications anyway, because the result URL will be different from the updating URL. • An alternative is to create the result in main-memory and then a) write it to the database and b) pass it on to the client. Here is an arbitrary example: declare %updating %rest:POST %rest:path('/city/$city/$population') function local:update($city, $population) { let $city := db:open('factbook')//city[name = $city] let $updated-city := $city update { replace value of node population with $population } return ( replace node $city with $updated-city, db:output($updated-city) ) }; Does this help? Christian

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questions webfrontend icw BaseX-queryserver bachend
by Rob Stapper 24 Nov '16

24 Nov '16

Hi, I'm working on this POC of a XML-database application with a web based frontend in Basex. I have a few questions: - what is the difference between the rest- and the restxq- prefix? Do they refer to different namespaces? - should I call database-functions in the backend- server through a client-server connection? If I call the database functions directly from my restxq-functions it just works. But is this a correct configuration in a multi-user environment? - in case of adding or changing data in the database, is it possible to retrieve the saved data form the dababase in the same session and return it to the webpage? The saved data is enriched with f.e. an unique identification that I want to return to the webpage. TIA for yout reply. Rob Stapper

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"No function found that matches the request, " basexhttp, OS X El Capitan, and brew
by lambert strether 20 Nov '16

20 Nov '16

I first installed basex using the brew script recommended under "Other Distributions" here: http://basex.org/products/download/all-downloads/ basexgui worked fine, but when I ran basexhttp and went to localhost:8984 (and 127.0.0.1:8984) I got the following error: "No function found that matches the request" Rather than debug that, I uninstalled the brew installation and downloaded the BaseX 8.5.3.zip to my Home directory (/Users/...). Everything worked flawlessly out of the box, including basexhttp. Mac users: Don't worry about no *.dmg file. In my experience, the zip file should be fine (assuming your system requirements are fine, like an up-to-date Java). * * * Every communication from this account is off the record, unless explicitly put on the record.

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BaseX-Talk November 2016