BaseX-Talk

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6 participants
5250 discussions

Static context
by Marco Lettere 04 Feb '17

04 Feb '17

Hi BaseX community, I'm wondering whether there is the possibility to keep some kind of in-memory state among successive RestXQ invocations. I know I could use the session object but this comes at the risk of loosing the state at session expiration. I could of course use a DB but with this solution I'm not sure that paying the overhead of accessing a database is worth for the small checks I need to perform. I was thinking of using Java and create some sort of singleton but this would introduce an unnecessary dependency from a custom jar. Maybe with the Jobs module? Any other clue? Thanks, Marco.

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Adding a JAR to BaseX
by Kristian Kankainen 04 Feb '17

04 Feb '17

Hello! When using BaseX on a server, I only need to add JAR files to the bin/ folder. But can someone point me where I should put the JAR files when I want to reach them from the BaseX GUI. I use the rpm packaged for Fedora 22. I have limited internet access currently ... that's the reason why I can't use my usual work-flow on this. Thanks, Kristian K

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request/suggestion
by Rob Stapper 04 Feb '17

04 Feb '17

Hi Christian, For my recursive sequencer ( as I call it) I would like to have something like a 'hof:self()'-function. This "hof:self()"-function would return the (declared) function where it is used in. I have several functions that call another function with itself as one of the parameters: For instance: Declare function A( $p1) { X( $p1, ., A#1) } ; Declare function B( $p1, $p2) { X( $p1, ., B#2) } ; It would be nice if there was something like a "hof:self()"-function so that I could make these functions more generic. For instance: Declare function A( $p1) { X( $p1, ., hof:self()) } ; Declare function B( $p1) { X( $p1, ., hof:self()) } ; Is it something that would enrich the hof-module ? Like to hear from you. Rob Stapper

2 4

Change XSLT processor in GUI?
by Regine I. Heberlein 02 Feb '17

02 Feb '17

Hello everyone, Is it possible to change the XSLT processor in the GUI, either from a menu option or as an argument to xslt:transform() or in some other nifty way that I haven't been able to figure out on my own? xslt:version() returns 1.0, but I need it to use 2.0, i.e. I want to invoke Saxon. I've looked through the documentation, but all I can find is instructions on how to do this in standalone mode by adding the jar file to the classpath. Many thanks, and apologies if I've overlooked the obvious! Regine Regine Heberlein Principal Cataloger and Metadata Analyst, Rare Book Collections Princeton University Library One Washington Road Princeton, NJ 08540 609-258-6156

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What's wrong here?
by Marco Lettere 01 Feb '17

01 Feb '17

Hello all, when running the following query: hof:until( function($i){ $i = 10}, function($i){ (admin:write-log(xs:string(current-dateTime()) || " -- " || $i), prof:sleep(1000), $i + 1)}, 0 ) I get the following output: 19:49:07.400 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 0 19:49:08.400 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 1 19:49:09.401 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 2 19:49:10.402 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 3 19:49:11.403 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 4 19:49:12.404 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 5 19:49:13.405 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 6 19:49:14.406 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 7 19:49:15.407 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 8 19:49:16.408 SERVER admin INFO 2017-02-01T19:49:07.399+01:00 -- 9 I would expect current-dateTime() to return a dateTime that increases by one second on every output. What is wrong with my understanding? Thanks, Marco.

2 2

XQuery performance degradation as number of json files grows
by Baysdon, Joseph 31 Jan '17

31 Jan '17

The performance of XQuery updates degrades as the number of JSON resources in my BaseX instance grows. In what ways might the number of JSON resources affect the performance of an XQuery update for a particular XML resource? I was under the impression that JSON resource were not indexed. (Note: this particular performance degradation is most dramatic when the BaseX server points to an NFS mount for the BaseX database.) Thanks, Joe

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Is it possible to use indices in sub-queries
by Clemens Müthing 31 Jan '17

31 Jan '17

Hello everyone I’ve recently started to use and stumbled upon a problem with the indices in basex that I do not fully understand and was hoping for some clarification. So basically I’ve got a bunch of xml files in my database with medical ICD-10 codes that all look like this: <classification name=„some-name“ year=„2017“ > <code> <value>03R80JZ</value> <final>true</final> </code> <code> <value>2W3JX1Z</value> <final>false</final> </code> … ... </classification> The db can contain multiple of these files, one for each name and year, and each classification can contain up to 100k of those codes (all values are unique). What I’d like to do now is, given a list of codes, check if those codes actually exist in the classification for a given name and source. So I came up with this straight-forward piece of code: let $proc := ('F0723EZ','0JWS37Z','0W054JZ','0NQ00ZZ','03R80JZ','0PW537Z','0RW940Z','0PPD0KZ','2W3JX1Z','0D9B8ZZ','0SWC30Z','0PRJ4KZ','025R0ZZ','0T1347C','0S950ZX','008J4ZZ','0D110K4','0XUV4JZ','0GTN4ZZ','4A133J1’) for $p in $proc return /classification[@name=‚some-name‘ and @year=2017]/code[value = $p] This does work fine, however it takes roughly one second to evaluate the query, and in the Query Info Window I can see that the text index of the db is not being used. However I do see that the attribute index is being queried. Now I noticed that, if I drop the attribute index, the query is evaluated basically instantaneous and can see that the query is rewritten to use the text index as well. So my question is: Is this normal, i.e. is it not possible to use multiple indices in one query at once? Or is this a problem where the „sub-query“ …./code[value = $p] is only evaluated on the result of the first query, thus the text index is not being considered? If so, is there a way (without rewriting the whole query) to make basex use both indices when compiling the query? Thanks a lot already and all the best Clemens Müthing

2 4

Send multipart binary with http client
by Maximilian Gärber 30 Jan '17

30 Jan '17

Hi, I can't figure out how to send a file in binary (not base64) when using multipart [1] On the body, I've tried method="basex" because the docs says this would write raw bytes to the request Regards, Max [1] declare function _:send-multipart($url, $file-name, $path) as item()* { let $uri := file:path-to-uri($path || $file-name) let $type := fetch:content-type($uri) let $binary := file:read-binary($path || $file-name) let $boundary_id := concat("batch_", random:uuid()) let $req := <http:request method="post" send-authorization="false" override-media-type="text/plain"> <http:header name="Accept" value="application/json"/> <http:header name="Accept-Encoding" value="gzip, deflate"/> <http:multipart media-type="multipart/form-data" boundary="{$boundary_id}"> <http:header name="Content-Transfer-Encoding" value="binary"/> <http:header name="Content-Disposition" value="form-data; name='FILE'; filename='{$file-name}'"/> <http:header name="Content-Type" value="{$type}"/>  <http:body media-type="application/octet-stream" method="binary"> {$binary} </http:body> </http:multipart> </http:request> let $resp := http:send-request($req, $url) return json:parse($resp[2]) };

1 1

Whitespace
by meumapple 30 Jan '17

30 Jan '17

Hi, I have a problem with whitespace handling of the default BaseX XML parser. If I have: <s>and <a>this</a> is</s> the parser deletes the spaces after "and" and before "is". Why not preserving the space as default option here? This kind of space is very important. I know that with adding xml:space I can solve the problem, but this is not easy to do automatically (moreover I cannot do this with copy/modify because all spaces are deleted after adding xm:space ). Is there a parameter which forces the parser to keep the spaces, without modifying the file? And in general, can the behavior of the parser be changed?

3 3

BaseX 8.6: The Winter Edition
by Christian Grün 30 Jan '17

30 Jan '17

Dear all, BaseX 8.6 is out! The new version of our XML database system and XQuery 3.1 processor includes countless improvements and optimizations. Many of them have been triggered by your valuable feedback, many others are the result of BaseX used in productive and commercial environments. The most prominent new features are: LOCKING - jobs without database access will never be locked - read transactions are now favored (adjustable via FAIRLOCK) RESTXQ - file monitoring was improved (adjustable via PARSERESTXQ) - authentication was reintroduced (no passwords anymore in web.xml) - id session attributes will show up in log data DBA - always accessible, even if job queue is full - pagination of table results INDEXING - path index improved: distinct values storage for numeric types XQUERY - aligned with latest version of XQuery 3.1 - updated functions: map:find, map:merge, fn:sort, array:sort, ... - enhancements in User, Process, Jobs, REST and Database Module CSV DATA - improved import/export compatibility with Excel data Visit http://basex.org to find the latest release, and check out http://docs.basex.org/ to get more information. As always, we are looking forward to your feedback. Enjoy! Christian BaseX Team

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