BaseX-Talk

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4 participants
5268 discussions

eval evil?
by Andy Bunce 29 Apr '12

29 Apr '12

Musing on the the usefulness of actions that update the database and return something, specifically in a web server with Xforms context, and the absence of XQuery scripting. I have been playing around with things like the following: let $s:=util:eval(' let $x:=copy $c:=db:open("listman","1.xml") modify (replace value of node $c/updated with current-dateTime()) return $c return db:replace("listman","1.xml",$x) ') return db:open("listman","1.xml") This works, but is it likely to stop working in the future? Is there a better way? /Andy

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Release 7.2.1: The Spring Edition
by Christian Grün 27 Apr '12

27 Apr '12

Dear all, once more, we are proud to announce a new version of BaseX! And once more, we can provide you with a whole bunch of new features: * Our value indexes now support string-based range queries: http://docs.basex.org/wiki/Indexes#Value_Indexes A big thank you to our sponsors who made this possible! * Our new XQJ API is based on Charles Foster's implementation. It fully utilizes the client/server architecture: http://xqj.net/basex * Import of XQuery modules has been simplified: http://docs.basex.org/wiki/Repository * Simplified invocation of Java code from XQuery: http://docs.basex.org/wiki/Java_Bindings * Full support for the XQuery 3.0 Regular Expressions syntax: http://www.w3.org/TR/xpath-functions-30/#regex-syntax * Updating functions can now return values: http://docs.basex.org/wiki/Database_Module#db:output * Unified handling of document and database URIs: http://docs.basex.org/wiki/Databases#Access_Resources * Pinning of opened database replaced by filesystem locking: http://docs.basex.org/wiki/Transaction_Management#Locking * REST, RESTXQ, WebDav: concurrency issues fixed As usual, we are looking to your feedback. Have fun, Christian BaseX Team http://basex.org

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Add a spatial index ?
by Haderer Nicolas 27 Apr '12

27 Apr '12

Hello I'am a phd student and i explore actually multiples no-sql solutions to store and process location data such as gml or gpx. I have already familiar with BaseX, and the combinaison XML/XQuery providing the flexibility needed for my project. However, process spatial data need spatial index such as R-tree in order to be processed efficiently. I would like to know if an implementation of spatial index into BaseX exist or are in project ? And if not, does the BaseX architecture allow to add new index easily ? Best regard Haderer Nicolas

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Fwd: Usin Basex for Desktop Application
by Lukas Kircher 26 Apr '12

26 Apr '12

Hi Anand, forwarding this to the list ... Regards, Lukas ---------- Forwarded message ---------- From: Anand Chiney <anandc.air(a)gmail.com> Date: Thu, Apr 26, 2012 at 10:25 AM Subject: Re: [basex-talk] Usin Basex for Desktop Application To: Lukas Kircher <lukaskircher1(a)googlemail.com> Hi Lukas, I want to know about the *maximum number of documents* that can be stored in the database and *Max. Size per Document... *I am planning to use baseX for my application which contains Resumes in XML format as data.* Also I am quite eager to know how will I UPDATE THE DB with new resumes..... * Have a nice day Regards Anand * * On Tue, Mar 27, 2012 at 2:54 PM, Lukas Kircher <lukaskircher1(a)googlemail.com > wrote: > Hi, > > It's generally possible to use BaseX as a standalone application. > You could start by taking a look at our local BaseX API examples > [1] in our documentation. > > Feel free to contact us, if you need any assistance. > > Regards, > Lukas > > [1] http://docs.basex.org/wiki/Java_Examples > > > > On Tue, Mar 27, 2012 at 9:29 AM, Sandeep Yohans <sandeepy.air(a)gmail.com>wrote: > >> Hello Sir/Madam, >> >> I am interested in using BaseX for my Desktop Application which I am >> developing using Java SE. >> >> Is it possible to use BaseX in a Desktop Application (Standalone >> Application) which will be installed on a computer with no internet >> connection or intranet? >> >> Looking forward to hear from you. >> >> -- >> Sandeep Yohans >> >> Developer >> AIR Infotech >> Nagpur - India >> www.airinfotech.in >> >> >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk(a)mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >> >> > -- Regards Have a nice day :) Anand Chiney

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a possible enhancement to program exit
by C. M. Sperberg-McQueen 24 Apr '12

24 Apr '12

In BaseX 7.2 just now, I pressed Command-Q to quit the program. My query had changed, so the program put up a dialog box to ask "Save changes to file?" with buttons for Yes, No, and Cancel. As I looked at the dialog box, I noticed that the query in question was not the one I had thought it was (for a project I was closing down) but a different one (the project I was intending to focus on next). So I didn't want to quit the program after all. I clicked on Cancel, expecting that my request to shut BaseX down would be canceled and BaseX would continue running with my query file still in place. But in fact BaseX exited anyway. As far as I can tell, it didn't save the query (no great loss, in this case, I think), so that Cancel effectively had the same effect as No. It's been a long time since I read anything about standard user interface idioms, so I don't want to go so far as to say that this is a bug. But it did surprise me, and so I suggest that it might be helpful to make the Cancel button in this dialog box cancel the quit action. Consider it a request for enhancement. Thanks! Michael -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

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Hallo
by lightning 24 Apr '12

24 Apr '12

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BaseXClient.py raised IOError
by Tarui, Kento 24 Apr '12

24 Apr '12

Hello guys, We came across the following error when we imported hundreds of thousands of xml documents. >>>>>>> Traceback (most recent call last): File "load.py", line 24, in <module> main(sys.argv) File "load.py", line 21, in main loadzip(session, path) File "load.py", line 12, in loadzip loadxml(session, info.filename, stream.read()) File "load.py", line 6, in loadxml session.replace(path, xml) File "/home/mwp/loader/BaseXClient.py", line 118, in replace self.sendInput(12, path, content) File "/home/mwp/loader/BaseXClient.py", line 205, in sendInput raise IOError(self.info()) IOError: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.2 Java: Sun Microsystems Inc., 1.6.0_23 OS: Linux, amd64 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: 2147483647 org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:401) org.basex.io.random.TableDiskAccess.insert(TableDiskAccess.java:278) org.basex.data.Data.insert(Data.java:970) org.basex.data.Data.insert(Data.java:744) org.basex.core.cmd.Add.run(Add.java:125) org.basex.core.Command.run(Command.java:345) org.basex.core.Command.run(Command.java:115) org.basex.core.cmd.Replace.run(Replace.java:64) org.basex.core.Command.run(Command.java:345) org.basex.core.Command.exec(Command.java:324) org.basex.core.Command.execute(Command.java:76) org.basex.core.Command.execute(Command.java:88) org.basex.server.ClientListener.execute(ClientListener.java:368) org.basex.server.ClientListener.replace(ClientListener.java:347) org.basex.server.ClientListener.run(ClientListener.java:150) >>>>>>> Our documents have the same structure and most of them are successfully imported, so it's unlikely to be something wrong in data. Can I ask you what this error actually indicates and what caused this? Our data is under contract so it's difficult to provide it directly. But if you have any questions about data, don't hesitate to ask us. Best regards, Kento

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why add large number file cause memory overflow?
by easy 23 Apr '12

23 Apr '12

I add more than 40000 file into database , use -Xmx14000m ,but still say memory not enough. do in basex,basexclient. -- 此致林晓东莫愁前路无知己，天下谁人不识君。

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GET for an application/query does not evaluate the query first
by Ludovic Kuty 22 Apr '12

22 Apr '12

Hi, I used an old version of BaseX (7.0 I think) and made HTTP GET requests to application/xquery ressources in the database which evaluated them before returning the result of the evaluation. That way I could used predefined XQuery queries stored in the database. The following sentence is written in the documentation at http://docs.basex.org/wiki/REST#Operations : "If a resource with content type application/xquery is addressed, it will be evaluated first, and the result will be returned." But it no more the case in 7.2 and instead I get the query verbatim, not the result of the evaluation. Indeed, Googling around I even found a bug correction made by Christian Grün ( https://github.com/BaseXdb/basex-api/blob/146d594931abe0143766203a329d8f682… ) to an old version of the code. We can see at lines 76 to 82 that an application/xquery ressource is evaluated first: if(type.equals(MimeTypes.APP_XQUERY)) { // execute raw file as query final ArrayOutput ao = new ArrayOutput(); session.setOutputStream(ao); session.execute(new Retrieve(ctx.dbpath())); query(ao.toString(), ctx); } Thus, I tried to find the same sort of code in the actual 7.2 version but could not. So I am wondering if this is a wanted omission, and thus the documentation is out of sync, or if it is an unwanted omission and needs to be corrected. The code I checked is at https://github.com/BaseXdb/basex-api/blob/master/src/main/java/org/basex/ht… The workaround I used is to put my queries as files in the HTTPPATH directory found in the .basex file. TIA for any clarification on that matter, Ludovic Kuty

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JSON/XML mapping
by Hans-Juergen Rennau 20 Apr '12

20 Apr '12

Hello, I have a couple of questions concerning the XML/JSON mapping, described in the documentation JSON Module/JSON Functions. 1) The text says: "As arrays have no names, <value/> is used as element name." But I suppose it should be "array members", rather than "arrays", as an array may of course be associated with a name as any other JSON item. Correct? 2) So are there all in all 6 reserved attributes names (type, numbers, booleans, nulls, objects, arrays) and 2 reserved element names (json, value)? Or have I forgotten some names? Thank you very much. Hans-Juergen

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