BaseX-Talk

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4 participants
5268 discussions

Hanging when inserting attribute
by Alex Markin 13 Jun '12

13 Jun '12

Hello all. I've tried to execute query for $i in collection('stars')/csv/record return insert node (attribute {'id'} {generate-id()} ) into $i with this <http://www.onlinedisk.ru/file/889304/> file (1000000 strings with 3 integer in any in csv format). I had a hang of basex and onece got the following: Exception in thread "Thread-526" java.lang.OutOfMemoryError: Java heap space Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: GC overhead limit exceeded at java.awt.EventQueue.postEvent(EventQueue.java:261) at java.awt.EventQueue.postEventPrivate(EventQueue.java:215) Exception in thread "AWT-XAWT" java.lang.OutOfMemoryError: GC overhead limit exceeded Exception in thread "SIGTERM handler" java.lang.OutOfMemoryError: GC overhead limit exceeded and again - the folowing: Exception in thread "AWT-XAWT" java.lang.OutOfMemoryError: Java heap space at java.util.logging.LogRecord.<init>(LogRecord.java:151) at java.util.logging.Logger.log(Logger.java:607) at sun.awt.X11.XToolkit.processException(XToolkit.java:535) at sun.awt.X11.XToolkit.run(XToolkit.java:614) at sun.awt.X11.XToolkit.run(XToolkit.java:543) at java.lang.Thread.run(Thread.java:679) Hang was even when I changed generate-id() to "1". Seems like a bug. Markin Alex.

2 4

fn:trace() does not print
by Brock, David 08 Jun '12

08 Jun '12

Was using fn:trace() to print out warning statements during XQuery processing. Worked fine using SAXONICA XQuery, but does not print anything in BaseX. Is there a setting to get this to work, or is there some other call that I can make to do same? Thanks!

2 5

Getting node by index.
by Alex Markin 08 Jun '12

08 Jun '12

Hi all. I've got another question about attribute indexing. The function index:attributes() returns strings like ... <entry count="1">id152429</entry> ... but how can I get objects in my data base that contain these indexes? Markin Alex.

2 11

CHECK Cmd
by Henrique Oliveira 08 Jun '12

08 Jun '12

Hi guys, I am trying to execute the command Check, I am getting the follow exception: java.io.IOException: Database 'TRADE' was not found. Shouldn't it create a new one DB if it does not exist? Regards -- Henrique Oliveira

2 2

query execution
by Radim Bača 08 Jun '12

08 Jun '12

Hello, I'm interested about BaseX technical details and its query exectution techniques. BaseX uses structural joins such as XPath accelerator as a main tree-join for a location step execution? In other words, do you use some other type joins a as well (i.e. holistic joins such as TwigStack)? I investigated the execution plans however I was not able to find any information about indexes used by each operation. Can I observe it from the plan like this: <QueryPlan> <GFLWOR> <For var="$b"> <IterPath> <DBNode name="xmark" pre="0"/> <IterStep axis="child" test="*:site"/> <IterStep axis="child" test="*:regions"/> <IterStep axis="child" test="*"/> <IterStep axis="child" test="*:item"/> </IterPath> </For> <Let var="$k"> <AxisPath> <VarRef> <Var name="$b" id="0"/> </VarRef> <IterStep axis="child" test="name"/> <IterStep axis="child" test="text()"/> </AxisPath> </Let> <Order> <OrderByExpr dir="ascending" empty="greatest"> <FNSimple name="zero-or-one(item)"> <AxisPath> <VarRef> <Var name="$b" id="0"/> </VarRef> <IterStep axis="child" test="location"/> </AxisPath> </FNSimple> </OrderByExpr> </Order> <Return> <CElem> <QNm value="item" type="xs:QName"/> <CAttr> <QNm value="name" type="xs:QName"/> <VarRef> <Var name="$k" id="1"/> </VarRef> </CAttr> <AxisPath> <VarRef> <Var name="$b" id="0"/> </VarRef> <IterStep axis="child" test="location"/> <IterStep axis="child" test="text()"/> </AxisPath> </CElem> </Return> </GFLWOR> </QueryPlan> XQuery: for $b in /site/regions//item let $k := $b/name/text() order by zero-or-one($b/location) ascending empty greatest return <item name="{$k}">{$b/location/text()}</item> Thank you for any response, Radim

2 1

Help for parsing http:send-request response
by Philippe Rathé 07 Jun '12

07 Jun '12

Hello folks, I'm using the HTTP Module[1] for sending request. The response has he http:response element which is XML. Then at the end of that element is the body of the response. If your ask for text/plain then you will have the text just after the closing </http:response>. <http:response status="200" message="OK"> ... </http:response>Hello World! In my case the media-type of the response is XML. I have something like the following: <http:response status="200" message="OK"> ... </http:response><service> <hello/> </service> How am I suppose to parse this output? That is the EXPpath spec, I have to deal with that. But parsing it with BaseX give the following error: No elements allowed after closed root element. True, that is not valid XML document. What is the best solution to parse separately the http:response and the body? Thanks, -- Philippe [1]: http://docs.basex.org/wiki/HTTP_Module

2 7

Using BaseX to query proprietary DB
by Brock, David 06 Jun '12

06 Jun '12

Wanting to develop and XQuery interface to proprietary DB and was hoping to use BaseX core for implementation. Is there a well-defined API for implementing such a thing, or would it be more a brute-force source-code sort of effort? Licensing implications? Thanks!

2 1

Cycle detected: a cycle exists in the type hierarchy between Prop and AProp
by Brock, David 06 Jun '12

06 Jun '12

When I load the baseX project in Eclipse 3.6 I get the following issues in org.basex.core.Prop.java which creates errors in all derived classes Cycle detected: a cycle exists in the type hierarchy between Prop and AProp The hierarchy of the type AProp is inconsistent

3 6

how to cache a pre-compiled query?
by Mauricio S. Castro 06 Jun '12

06 Jun '12

I am trying to use QueryProcessor to compile and cache for later, in case no used modules have changed, is this ok? Can I concurrently use QueryProcessor within the same JVM in different threads? Thanks. -- Maurício Santiago de Castro mauricioscastro(a)hotmail.com <mailto:mauricioscastro@hotmail.com><http://br.linkedin.com/pub/mauricio-castro/17/275/a5b><http://www.delicious.com/mscastro><http://twitter.com/#%21/mauricioscastro>mauriciosantiagodecastro@facebook <http://facebook.com/mauriciosantiagodecastro><https://mscastro.startssl.com/>

2 1

BaseX Standalone -i flag may need clarification
by Philippe Rathé 06 Jun '12

06 Jun '12

Hello there, I'm using the CLI to load a xml file from my file system: java -cp basex.jar org.basex.BaseX -i myfile.xml myscript.xqy The first time I run the command, everything is fine, my file is loaded and my xquery script is executed. But the second time I run it, whenever I change the content of myfile.xml, it is not taken in consideration. I realized that it stores my file in the database the first time and after that it loads it from the database. I was confused because it worked the first time. Could it refresh the content of the database whenever a file exists? And fallback to open the file from database when the specified file does not exist? Whatever, maybe just a clarification about the behavior in the doc could prevent bad usage. Thanks.

2 6

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