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Catching BXFE0001 when fetching binary
by Alexander von Bernuth 11 Jun '13

11 Jun '13

Hi folks, I'm a student working on my bachelor thesis. I use BaseX to read large XML files and forward them to a PostgreSQL database. Additionally I want to fetch images via URI and add them to the database-records. While fetching these images, I have to test three different file extensions for each image, as my source does not use one single image format (but jpg, png and gif). First I tried checking with fn:doc-available($uri) weather that certain URI is available, but this obviously only works for XML-documents. Then I wanted to catch the err:BXFE0001 that is thrown by fetch:binary($uri), but this does not work, either; the error-message is displayed and the script stops. > declare variable $baseuri := 'http://www.bricklink.com/ML/'; > declare variable $itemid := 'sw008'; > > try { > fetch:binary($baseuri || $itemid || '.png') > } > catch err:BXFE0001 { > try { > fetch:binary($baseuri || $itemid || '.gif') > } > catch err:BXFE0001 { > try { > fetch:binary($baseuri || $itemid || '.jpg') > } > catch err:BXFE0001 { > 0 > } > } > } In this example, only the .jpg-image exists. But all I get is > [BXFE0001] Resource "http://www.bricklink.com/ML/sw008.png" not found. > Information: > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> > <HTML><HEAD><TITLE>The page cannot be found</TITLE> … and so on I would be very glad if you could help me with this, either by pointing out my coding-error or by showing me another, better solution for doing this. Thank you and have a nice day, Alex PS: My sources on Try/Catch and fetching -- | Alexander von Bernuth | alexander.von-bernuth(a)student.uni-tuebingen.de

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baseX-core vs baseX-api
by David Dobbs 10 Jun '13

10 Jun '13

So, I have a couple of (hopefully simple) questions about the Java APIs provided by BaseX. Based on the comments in the examples, it looks like the function calls in the RunQueries.java example (https://github.com/BaseXdb/basex-examples/blob/master/src/main/java/org/bas…) are strictly local calls that operate directly on local XML documents - there's no BaseX server involved, no client communication, no files created in org.basex.path, etc. Is that correct? What's the difference between the queries in RunQueries.java and QueryCollection.java? My guess from skimming the documentation is that, per above, RunQueries just uses BaseX's XQuery API, without taking advantage of BaseX's indexing, etc capabilities, whereas QueryCollection creates a (local) BaseX server, indexes the document, and then its queries would be accelerated using those indexes. Is this also correct? Thanks, -David

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(x)query, db lookup, and update in one step
by buzz chopra 08 Jun '13

08 Jun '13

Hello All, I'm relatively new to basex and xquery - but am using basex as a large report repository. I'd like to try and perform the following xquery - but with some intermediate steps: xquery for $rep in collection('coll')/Report let $attr0 := $rep/@attr0 return (replace value of node $rep/@attr1 with 'zzz') The actual value represented by 'zzz' above must be based on a separate (physical) database lookup for each attribute value $attr0 in the collection ( i.e. the values of attr1 is a (non-trivial lookup) function of attr0. Is this a scenario in which multiple queries would have to be made based on the number of documents in the collection ? Perhaps there is some slick way of including a call out to some method to such that the 'zzz' above is replaced with something like: JavaModule.doLookup($attr0) ? I'm executing xquery from a jruby application so either the ruby or the java client can be used (perhaps that is somewhat irrelevant). Thanks in advance for any suggestions, Buzz

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Java binding for Enums?
by Andy Bunce 07 Jun '13

07 Jun '13

Hi, Is there a way to access Java Enums via the Java bindings. I am trying to implement something like [1] without writing any Java. I have: declare namespace File="java:java.io.File"; declare namespace ImageIO="java:javax.imageio.ImageIO"; declare namespace Scalr="java:org.imgscalr.Scalr"; declare namespace Mode="java:org.imgscalr.Scalr.Mode"; let $src:=File:new("C:\tmp\pic.jpg") let $bsrc:=ImageIO:read($src) let $small:=Scalr:resize($bsrc,*"??what here??"*,xs:integer(50)) let $dest:=File:new("C:\tmp\small.jpg") return ImageIO:write($small,"jpg",$dest) But I cant see a way to supply the Enum Scalr.Method required by resize.[2] The tempting $Mode:AUTOMATIC does not work. /Andy [1] http://programming.mvergel.com/2013/01/resize-images-using-java.html#.UbHQw… [2] http://www.jarvana.com/jarvana/view/org/imgscalr/imgscalr-lib/4.2/imgscalr-…

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Comments after XML declaration cause XQQueryException
by Dustin Schultz 06 Jun '13

06 Jun '13

Hi, I'm noticing an issue where an XQQueryException is thrown if there are comments after XML declaration. I noticed it since license headers often go in this location (e.g. Apache License 2.0) Here is an example program that demonstrates the issue https://gist.github.com/dustinschultz/5718281 I believe the bug resides within the xqj-basex code but I have no idea where post bug reports and the source doesn't seem to be available. (Is it possible to get the source?) Thanks, Dustin

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External variable of type document-node in GUI
by Dustin Schultz 06 Jun '13

06 Jun '13

Hi, I can't seem to figure out how to bind an external variable as a document. I've searched all of the docs and am at a bit of loss. Is the following possible? possible? I've tried the following: http://pastebin.com/sbekQZNP With the following XQuery: http://pastebin.com/W8ZcMxJ9 But it always results in the error 'Invalid cast from xs:untypedAtomic to document-node()' - how does one tell it to be an document-node and not an xs:untypedAtomic. I've also tried setting it to doc('path/to/xml') with no luck Thanks, Dustin

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server time out
by Cerstin Elisabeth Mahlow 05 Jun '13

05 Jun '13

Hi, I run several web applications using various CGI scripts to read and update BaseX databases via various XQUERIES. I use the "basexserver -S" command to start the server on a CentOS Server. Maybe this is not the very best idea. I already split the data into various databases to avoid concurrent reading and writing. And I have a simple cron job running, that tests whether the BaseX server is still running and restarts it if it isn't running any more. However, my users get (or rather create) a time out from time to time. If the basex server then shut's down, the cron job would restart it and everything is fine again. In the last weeks, however, I discovered that after such a time out the Basex server seems to still be running, but doesn't answer any xquery any more. So I have to kill the process by hand and restart it again. Could you recommend a better solution to ensure smooth running of the Basex server even it sometimes a time out occurs? Thanks in advance and best regards Cerstin -- Dr. phil. Cerstin Mahlow Universität Basel Departement Sprach- und Literaturwissenschaften Fachbereich Deutsche Sprach- und Literaturwissenschaft Nadelberg 4 4051 Basel Schweiz Tel: +41 61 267 07 65 Fax: +41 61 267 34 40 Mail: cerstin.mahlow(a)unibas.ch Web: http://www.oldphras.net

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Using an XSD with BaseX (to provide extra type information)
by Ludovic Kuty 05 Jun '13

05 Jun '13

Hello, I would like to know if BaseX will use the XSD referenced in an XML document to get extra informations about types (he PSVI) and if it will validate the document in the process. If it does so, where do I have to store the XSD ? I would like to store it inside the database itself (or another one). I could also store it in the Web application provided by BaseX and make my URL point to it. In my opinion, the use of the validation module should not be necessary as it should happen automatically. Thank in advance for your insights and informations, Ludovic Kuty

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Logging Modules/Framework for XQuery
by Dustin Schultz 04 Jun '13

04 Jun '13

Hi, I'm wondering if there are any logging frameworks available for XQuery? I've searched around and can't find much other than the built in fn:trace and fn:error functions. I'm looking for something that can log to different levels (e.g. INFO, DEBUG, ERROR) but also be disabled for no output. I was thinking it would be something built around fn:trace and fn:error. I've considered writing a RESTful logging service – have others used this approach? Thanks, Dustin

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led under water light offer
by crystal2 04 Jun '13

04 Jun '13

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