BaseX-Talk January 2014

basex-talk@mailman.uni-konstanz.de

43 participants
60 discussions

A free-form XQuery through RESTXQ?
by Neven Jovanović 11 Jan '14

11 Jan '14

Hello, my name is Neven Jovanovic, and I have beginner's problems with BaseX RESTXQ interface. We'd like to have a textarea form where users would compose their own XQueries to be executed over our database (just querying it, no updating etc). I have already written a cgi Perl script which does this through BaseX REST interface. Now I'd like to do the same with RESTXQ, but I'm missing something. For testing purposes, we use the .zip version of 7.7.2 release, on Linux Mint Debian (locally), started with .basexhttp. Everything works OK, the db is there etc. Here is the form added to the existing restxq.xqm: <h3>Write an XQuery</h3> <p>Compose your own XQuery.</p> <form method="post" action="compoxq"> <p>XQuery:<br /> <textarea name="query" rows="5" cols="80"></textarea><br/> <input type="submit" /></p> </form> Here is the function added to the restxq.xqm: (:~ : A free-form XQuery. :) declare %rest:path("/compoxq") %rest:POST %rest:form-param("query","{$query}", "(no query)") function page:cpxq-postman( $query as xs:string*) { let $q := $query return element q { collection("crobib")//$q } }; Submitting the following form string: //*:person I get these results at <http://localhost:8984/compoxq>: <q> //*:person //*:person //*:person //*:person //*:person (lots more...) </q> Some query obviously is being performed, but instead of results, I get the query string. Appreciating your help, Neven Neven Jovanovic University of Zagreb Hrvatska / Croatia

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Possible bug in BaseX interpreter, might be the introspection module ?
by jean-marc Mercier 11 Jan '14

11 Jan '14

Hello, I have a quite strange behavior, that might be a bug in the introspection module. I am just describing it, and will work a bit to produce a reproductible code if you don't have a quick clue about the problem. I created a map of string to functions, called $common:MapIntrospecting, generated by the introspection module. The following code works perfectly (you can't run it, but believe me :) declare variable $map := map:entry("Alimentation:nodes#1",Alimentation:nodes#1); declare variable $nodes := a big node... let $fun_1 := map:get($map,"Alimentation:nodes#1") let $fun_2 := map:get($common:MapIntrospecting,"Alimentation:nodes#1") return $fun_2($nodes) And now, the following code (I just cut the useless first line) produces a spurious and ferocious exception let $fun_2 := map:get($common:MapIntrospecting,"Alimentation:nodes#1") return $fun_2($nodes) Any clue ? Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.8 beta 132460f Java: Oracle Corporation, 1.7.0_45 OS: Windows 7, amd64 Stack Trace: java.lang.ClassCastException: org.basex.query.value.type.AtomType cannot be cast to org.basex.query.value.type.FuncType at org.basex.query.func.InlineFunc.item(InlineFunc.java:261) at org.basex.query.func.InlineFunc.value(InlineFunc.java:280) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFuncCall.evalArgs(StaticFuncCall.java:154) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:203) at org.basex.query.func.FuncCall.invoke(FuncCall.java:96) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFuncCall.evalArgs(StaticFuncCall.java:154) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFuncCall.evalArgs(StaticFuncCall.java:154) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:203) at org.basex.query.func.FuncCall.invoke(FuncCall.java:96) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:203) at org.basex.query.func.FuncCall.invoke(FuncCall.java:96) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.var.StaticVar.value(StaticVar.java:129) at org.basex.query.var.StaticVarRef.value(StaticVarRef.java:58) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFuncCall.evalArgs(StaticFuncCall.java:154) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.expr.List.value(List.java:133) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:203) at org.basex.query.func.FuncCall.invoke(FuncCall.java:96) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:130) at org.basex.query.func.FuncCall.invoke(FuncCall.java:96) at org.basex.query.func.FuncCall.value(FuncCall.java:52) at org.basex.query.QueryContext.value(QueryContext.java:366) at org.basex.query.MainModule.value(MainModule.java:79) at org.basex.query.QueryContext.value(QueryContext.java:323) at org.basex.query.QueryContext.iter(QueryContext.java:309) at org.basex.query.QueryProcessor.iter(QueryProcessor.java:81) at org.basex.core.cmd.AQuery.query(AQuery.java:89) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:329) at org.basex.core.Command.execute(Command.java:94) at org.basex.server.LocalSession.execute(LocalSession.java:121) at org.basex.server.Session.execute(Session.java:37) at org.basex.core.Main.execute(Main.java:146) at org.basex.BaseX.<init>(BaseX.java:119) at org.basex.BaseX.main(BaseX.java:38)

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restxq file upload with no file selected
by Andy Bunce 11 Jan '14

11 Jan '14

Hi, In the case where I submit a form with an input type= "file" without selecting a file. The server side map [1] has one entry with empty name and content. It seems to me it would be more useful to return an empty map in this case. Regards /Andy [1] http://docs.basex.org/wiki/RESTXQ#File_Uploads

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tiny request
by Rob Stapper 11 Jan '14

11 Jan '14

Hi, I've a tiny request. It concerns the inputbar in the BaseX-GUI in query-mode with a opened database. It used to work that after typing a slash ( '/') in the inputbar all the child-elementtypes were shown in a dropdown box. Now this only works for the root (initial slash) but not anymore for under laying elements . For these elements the dropbox is only presented after typing a character. The dropbox then only contains the child-elementtypes that start with this character(s). So I'm not presented with all the child-elementtypes anymore, which is too bad because I used this option for finding my way within the XML-structure. For example: <a> <b> <d1> </d1> <e1> </e1> </b> <c> </c> </a> Inputbar: / gives a dropbox with 'b' and 'c'. That's nice. Inputbar: /b/ gives nothing. I would like to see: 'd1' and 'e1' Inputbar: /b/d gives a dropdown with 'd1'. Could this be fixed? I think it's such a nice little option. Thnx and greetz, Rob Stapper --- Dit e-mailbericht bevat geen virussen en malware omdat avast! Antivirus-bescherming actief is. http://www.avast.com

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Java bindings - ambiguous Signature
by Andy Bunce 11 Jan '14

11 Jan '14

Hi, In my ongoing attempts to use various Java libraries, without writing any Java myself, I have trying Apache Tika. (http://tika.apache.org/1.4/api/org/apache/tika/Tika.html). With the tika jar on the classpath I hoped the following would work: import module namespace tika = "java:org.apache.tika.Tika"; declare namespace File="java:java.io.File"; let $file :=File:new("xx.pdf") return tika:parse($file) It generates the error Signature 'org.apache.tika.Tika.parse' is ambiguous Which maybe it is from some perspectives :-). I hoped some type information might be available in the $file variable to resolve this, but it appears not. I was wondering about the possibility of using Java type at the XQuery level e.g. let $file as java:java.io.File :=File:new("xx.pdf") Is there any way to avoid writing the couple of line Java class shim for this and similar cases? Regards /Andy

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Incremental fulltext update?
by Florent Heyworth 11 Jan '14

11 Jan '14

Hi all I've been experimenting with BaseX - and I'm quite pleased with its capabilities - however I'm hitting a wall where the fulltext index is concerned. Here's the use-case: - Web application analyzing media (news, etc.) on a large scale - Frequent inserts (metadata about news) by many clients (ca. 40+ million documents per year) - Online Full-text search is a must Every time data is inserted into a database the full-text index is invalidated. Because of the online full-text search capability requirement a 2-stage update process (store to temporary database, batch update to main database and optimize full-text index afterwards) is unfortunately not an option. Are there plans to provide for incremental full-text update capacity or is this not an option? Thanks for any feedback and kind regards Florent

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bug in QueryCollection.java example
by Morris 11 Jan '14

11 Jan '14

Hi there I tried out the QueryCollection example from github and discovered there is a bug in line 47 ``` for $doc in collection() ``` causes [FODC0002] No default collection available. I think it should be ``` for $doc in collection("Collection") ``` then the error is gone.

2 1

add-dayTimeDuration-to-date
by jean-marc Mercier 11 Jan '14

11 Jan '14

Hello, I am trying to add dates and duration through BaseX, in conformance with http://www.w3.org/TR/xpath-functions-30/#func-add-dayTimeDuration-to-date. However, BaseX interpreter does not recognize the function add-dayTimeDuration-to-date, nor op:add-dayTimeDuration-to-date. Did I misunderstood something ? Thanx for your answer, Cheers, Jean-Marc

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Urgent Help, concurrently update db cause db error, how???
by easy 11 Jan '14

11 Jan '14

Hi,all, I have a restxq web service to do insert or update xml doc , which is called by many clients to provide xml data to db, there will be 500000 files to provide to basex server. I have found some problem few times : 1) often, after insert tens of thousands xml file, the db "list" will cause error,cause db corrupt, I don't know why, How, please help me. I don't know how to control the concurrently update db. 2) I often found there will automatically startup a basexhttp service in the server even the manually started service still run. ???, maybe the "basexhttp stop" command can't stop the service though it say stopped. the restxq service code as fellow: ---------------------------------------------------------- declare %output:method("xml") %output:omit-xml-declaration("no") %output:media-type("application/xml") %updating %rest:path("/add_ehr_doc") %rest:POST("{$body}") %rest:header-param("pid","{$pid}") %rest:header-param("doc_id","{$doc_id}") %rest:header-param("op","{$op}","APND") function ehr:add_ehr_doc( $body,$pid as xs:string,$doc_id as xs:string,$op as xs:string ) { let $dbname: ='myehr' let $fp:=substring($pid,1,6)||'/'||substring($pid,7,8)||'/'||substring($pid,15)||'.xml' (: pid is a patient id code as: area_code-section_code-serialnumber :) return try{ if (db:exists($dbname,$fp)) then ( insert node ($body//*:DataSet) into (doc($dbname||"/"||$fp)//*:BasicDataset), db:output(<msg><Ack>200:append</Ack><Url>{$fp}</Url></msg>) ) else ( db:add($dbname, $body,$fp),db:output(<msg><Ack>200 new add</Ack><Url>{$fp}</Url></msg>) ) } catch *{ db:output(<msg><Ack>201 error</Ack></msg>) } }; -- 此致林晓东莫愁前路无知己，天下谁人不识君。

2 1

query function like matches can't work fast as = op , how to optimizer it? how to create range index?
by easy 11 Jan '14

11 Jan '14

hi,all, I found the @attribute='value' operation will fast after create attribute index, but function like matches,contains,starts-with has no effect even after create text index. how to optimum it , how to create path index, range index? thanks. -- 此致 easy 莫愁前路无知己，天下谁人不识君。

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BaseX-Talk January 2014