BaseX-Talk

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6 participants
5250 discussions

Separate Databases vs. Directories Within One Databse?
by Eliot Kimber 16 May '15

16 May '15

In the discussion of adding metadata to a bunch of files Christian points out that you can both limit queries to directories within a single database or apply a query to multiple databases. My question: when or why would you prefer one approach over the other? In my case I'm using BaseX to reflect the XML contents of git repositories. My current approach is to create a separate database for each repo/branch pair, my reasoning being that that makes it easiest to limit queries to just that branch. Because the BaseX data is intended to be a read-only reflecting of the git-managed source, it also makes it easy to clear the data for a branch if it's gotten out of sync (or I suspect it's gotten out of sync) by simply dropping the database. I have complete control over the queries (through a library of functions that understand the git nature of the databases), so I could just as easily use a single database with subdirectories that reflect the repos and branches. In this scenario, as an example, is there any compelling reason to use one approach or the other? I like having one database per branch because that seems like a natural mapping that generally keeps things simple and more or less obvious (e.g., doing "list" will show the list of databases, which reflect the repo and branch names in their names). In this application the scale will usually be relatively small: 1000s or 10s of 1000s of individual documents in any given branch but the querying and indexing, which supports maintaining knowledge of the links within the XML content, could get intense. Cheers, Eliot ————— Eliot Kimber, Owner Contrext, LLC http://contrext.com

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BaseX native User module
by Marco Lettere 16 May '15

16 May '15

Hi Christian, do you have any idea on the performances of the users module that comes with BaseX? Does it work properly with a count of users up to several hundreds? thousands? Any tests done so far? Thank you. BR, Marco.

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Lock/release question
by France Baril 14 May '15

14 May '15

Hi, I am trying to find documentation on functions to explicitly lock/unlock specific files stored in BaseX for a predefined user. Something like: db:lock('db, 'file.xml', 'user', 'write') Something like: db:get-lock-details('db', 'file.xml') would be interesting too. I couldn't find anything. Am I supposed to work with the ~webdav DB? We're trying to get away from the WebDAV interface. Thanks, France -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com

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BaseX Java examples
by Menashè Eliezer 14 May '15

14 May '15

Hello, The page http://docs.basex.org/wiki/Java_Examples is very detailed. However, I wonder in which cases one should use the BaseX XQJ API and not the standard client. e.g., which client offers a better performance? -- With kind regards, Menashè

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Joe Wicentowski collects sites that are powered by XQuery
by Alexander Holupirek 13 May '15

13 May '15

For those who have sites that are powered by BaseX/XQuery. > Begin forwarded message: > > From: Joe Wicentowski <joewiz(a)gmail.com> > Subject: [xquery-talk] @XQuery, #xquerypower, and related efforts > Date: 13. Mai 2015 21:03:56 MESZ > To: XQuery Talk <talk(a)x-query.com> > > Dear XQuery Talk, > > Friends of Jim Fuller may know that, after many years of excellent stewardship, Jim decided to give up his @xquery twitter account for @_jim_fuller. I've taken on the task of using the account to post links of interest to users and learners of XQuery, and promoting the use of XQuery. > > https://twitter.com/XQuery <https://twitter.com/XQuery> > > I'm currently posting a daily link to sites that are powered by XQuery. I've begun collecting these in a simple GitHub page. I would welcome all to submit pull requests. > > https://github.com/joewiz/xquerypower <https://github.com/joewiz/xquerypower> > > And I'd encourage anyone interested to follow @XQuery. I'll gladly retweet items of interest, and the easiest way for me to notice you is to use the term "XQuery"! > > Thanks, > Joe > _______________________________________________ > talk(a)x-query.com > http://x-query.com/mailman/listinfo/talk

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unexpected behaviour
by Rob Stapper 13 May '15

13 May '15

Hi Christian, Can you have a look at the attached program. Both items of the returned sequence of the program should do the same thing. Both do give the same, correct result: an empty sequence, but the first item unnecessarely triggers function: "local:f1#1" , while the second item doesn't. This a pity since "local:f1#1" could be a time-consuming function. Cheers, Rob --- Dit e-mailbericht is gecontroleerd op virussen met Avast antivirussoftware. http://www.avast.com

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Re: [basex-talk] unexpected behaviour
by Christian Grün 13 May '15

13 May '15

If I get it right, you would also expect '!' not to be output in the following query, right? declare function local:f($a, $b) { if($a) then $b else () }; local:f((), trace('!')) In this case, you'll have to wrap your trace call in a function: declare function local:f($a, $b) { if($a) then $b() else () }; local:f((), function() { trace('!') }) Best, Christian On Wed, May 13, 2015 at 11:44 AM, Rob Stapper <r.stapper(a)lijbrandt.nl> wrote: > Hi Christian, > > > > This is the best I can do without losing the essence of the issue. Sorry > about the import, forgot to remove that one. > > The clue is in the “Query Info”-window. It shows: > > > > Evaluating: > > f1: 1 > > Compiling: > > ……. > > > > So function “local:f1#1” is unnecessarely evaluated with value 1. > > > > Success, > > Rob > > > > *Van:* Christian Grün [mailto:christian.gruen@gmail.com] > *Verzonden:* woensdag 13 mei 2015 11:13 > *Aan:* Rob Stapper > *CC:* BaseX > *Onderwerp:* Re: [basex-talk] unexpected behaviour > > > > Hi Rob, > > > > It usually takes me some time to understand new code, so could you > possibly simplify the example as much as possible? For example, the import > cannot be resolved, an empty squence is bound to $a, which means that one > branch will never be called, and maybe you can simplify the partial > function application as well.. > > > > Thanks in advance, > > Christian > > > > > > > > On Wed, May 13, 2015 at 9:55 AM, Rob Stapper <r.stapper(a)lijbrandt.nl> > wrote: > > Hi Christian, > > > > Can you have a look at the attached program. > > Both items of the returned sequence of the program should do the same > thing. > > Both do give the same, correct result: an empty sequence, but the first > item unnecessarely triggers function: “local:f1#1” , while the second item > doesn’t. > > This a pity since “local:f1#1” could be a time-consuming function. > > > > Cheers, > > Rob > > > ------------------------------ > > [image: Afbeelding verwijderd door afzender. Avast logo] > <http://www.avast.com/> > > Dit e-mailbericht is gecontroleerd op virussen met Avast > antivirussoftware. > www.avast.com > > > > > > > ------------------------------ > [image: Avast logo] <http://www.avast.com/> > > Dit e-mailbericht is gecontroleerd op virussen met Avast > antivirussoftware. > www.avast.com > >

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Add metadata to a group of documents inside the database
by Menashè Eliezer 13 May '15

13 May '15

Hello, I have two groups of xml to be included in the same database. Usually the same query will be performed on both of them, but I need to able to query only one group. The difference between the groups is known only to add the xml files, e.g. the origin of the files. This information is not found inside the files, and I prefer not modifying their content. I was hoping to be able to define groups, using subfolders and base-uri or multiple collections, but I know it's not possible using Basex. Maybe I can tag them? The group type is both a property and a possible filter in a query, so I need a good performance. Right now I see two alternatives: 1. Using two separate databases. Once I need to query all files, I'll make the same query on multiple databases... 2. One database, but a query to a new xml document, which includes list of node-ids per group type, will be used both for knowing the type and for querying a subset. Any ideas, please? -- With kind regards, Menashè

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Re: [basex-talk] Problem with Variable having Numericvalue node comparison
by ankit kumar 13 May '15

13 May '15

Thanks for your reply. Actually, The comparison expression is coming from other side. So changing the expression is not possible for me. Thanks, Ankit On 13 May 2015 at 13:18, Marco Lettere <marco.lettere(a)dedalus.eu> wrote: > On 13/05/2015 09:40, ankit kumar wrote: > >> let $v3 :=<a>7900000.00</a> >> let $v2:=<a>930000.00</a> >> return $v2 <= $v3 >> > > Hi Ankit, > > is the following: > > let $v3 :=<a>7900000.00</a> > let $v2:=<a>930000.00</a> > return xs:float($v2) <= xs:float($v3) > > too much of a change for your use-case? > M. >

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Problem with Variable having Numericvalue node comparison
by ankit kumar 13 May '15

13 May '15

Hi, I am trying to compare two variable in basex as given, let $v3 :=<a>7900000.00</a> let $v2:=<a>930000.00</a> return $v2 <= $v3 I am expecting that it will give me true, But it is giving false. I think it is because of the comparison is only string comparison. Is it possible to configure basex for numeric comparison without changing the expression $V2 <= $V3 , or I have to explicitly convert variable value to decimal and then compare it. Thanks, Ankit

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