- BaseX-Talk - mailman.uni-konstanz.de

XPath child::node() axis sequence order
by Tojo Rakotoarison 10 Dec '13

10 Dec '13

Hi ! In BaseX, is the result of the child::node() axis always in document-order ? Thanks ! -- Tojo Rakotoarison *@tojo_rs <https://twitter.com/#%21/tojo_rs>*

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Re: [basex-talk] Seeking help on how to update XML file(INSERTION)
by Charles Foster 09 Dec '13

09 Dec '13

Hi Cong, BaseX XQJ supports XQuery 3.0, XQuery Update Facility as well as XQuery Full Text. If you are executing an XQuery Update expression and the BaseX XQJ driver is producing an XQException where BaseX was never even contacted in the first place, then this is a bug in BaseX XQJ. Bugs found in any XQJ driver from xqj.net can be reported at: http://xqj.net/issues To find out for sure, I would suggest turning debug mode to its highest level, with code along the lines of: XQDataSource ds = new BaseXXQDataSource(); ds.setProperty("logLevel", "TRACE"); ds.setLogWriter(new PrintWriter(System.out, true)); XQConnection xqc = ds.getConnection(); /** execute your update expression **/ Regarding the second problem, to make sure your XQResultSequences produced from an XQConnection instance is scrollable, you could use: XQConnection xqc = ds.getConnection(); XQStaticContext xqsc = xqc.getStaticContext(); xqsc.setScrollability(XQConstants.SCROLLTYPE_SCROLLABLE); xqc.setStaticContext(xqsc); /** execute expressions via xqc **/ Alternatively, you can create a scrollable copy of any type of XQSequence via the createSequence method, for instance: XQResultSequence rs = executeQuery(); XQSequence scrollableCopy = xqc.createSequence(rs); Hope this helps. Kind Regards, Charles > ---------- Forwarded message ---------- > From: Liu Cong <p5j6npaa(a)126.com> > Date: Sat, Dec 7, 2013 at 8:23 PM > Subject: [basex-talk] Seeking help on how to update XML file(INSERTION) > To: basex-talk(a)mailman.uni-konstanz.de > > > Hi all, > > Nice to be in this community! > > We are currently doing a project on XML database using BaseX and using > XQJ API to develop it in eclipse. What troubled us now is that when we > doing an insertion or deletion, there is actually nothing changed in > the XML file. Then I checked that it seems that XQJ is not available > to XQuery update. Is it really like that? Otherwise, how can we write > or delete things in the XML file? > > Another problem: when we want to show what has been changed for the > cached XML file, I get this notification: > '' > According to the XQJ 1.0 Specification, executing expressions via > XQPreparedExpression or XQExpression implicitly closes the previously > created XQResultSequence object which was tied to the parent > XQConnection object. > To keep a XQResultSequence alive and accessible, you could either > create an immutable XQSequence by using > XQConnection.createSequence(XQResultSequence) or modify the > XQStaticContext's Scrollability property to ensure that future > XQResultSequence objects will be "SCROLLABLE" (cached) and not > "FORWARD_ONLY" (streamed). > Please read the XQJ.NET documentation for further details.' > > I understand what does it mean but do not quite understand how to use > XQConnection.createSequence(XQResultSequence) or modify the > XQStaticContext's Scrollability property. Could you kindly give me > some guidance on that? > > My code is like:" > XQPreparedExpression aaa =xqc.prepareExpression(.......); > XQPreparedExpression bbb =xqc.prepareExpression(.......); > > XQResultSequence rs = aaa.executeQuery(); > XQResultSequence as = bbb.executeQuery(); > > while(rs.next()) > System.out.println(rs.getItemAsString(null)); > System.out.println(as.getItemAsString(null));" > > Many thanks! > > Cong Liu > > > > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

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Re: [basex-talk] PP PE and all kinds of excellent plastic material from gold supplier
by angelina＠andexintrade.com 09 Dec '13

09 Dec '13

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欧美国家纯电池移动电源产品空运快递专家不需要任何电池文件
by jacky-msi 08 Dec '13

08 Dec '13

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Issue with backup
by John Best 08 Dec '13

08 Dec '13

Hi team, The backup have some problem... After taking multiple backups, all the previous backups get affected... Suppose, I took backup, say B1, then I made some changes and took another backup say B2.. Then the backup B1 is also getting affected... -- Have a nice day JBest

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some questions over the profile module
by jean-marc Mercier 07 Dec '13

07 Dec '13

Hello Christian, I have some small questions over the profile module. 1) The following code declare function local:sequence($nb){for $i in 1 to xs:integer($nb) return $i}; prof:time(fn:count(local:sequence(1000000000000000000))) return 4.94 ms. It means that you lazy evaluate the query "{for $i in 1 to xs:integer($nb) return $i" ? (I recall that you already mentioned this point that but I would like a confirmation, since it might be a profiler issue) 2) It seems that you somehow call the fn:trace function in the profile module. Is there a way to catch the returned values of these functions ? The motivation is for profiling purposes. To be more specific, I would like to treat the output results as <output @function = "my_function">{prof:time( "xquery" ) }</output> to be able to aggregate results at a higher level of call, i.e. something like for $output in $prof//output let $fun := data($output/@function) group by $fun return element-name{$fun}{sum(data($output) ) } Thanks Jean-Marc

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Seeking help on how to update XML file(INSERTION)
by Liu Cong 07 Dec '13

07 Dec '13

Hi all, Nice to be in this community! We are currently doing a project on XML database using BaseX and using XQJ API to develop it in eclipse. What troubled us now is that when we doing an insertion or deletion, there is actually nothing changed in the XML file. Then I checked that it seems that XQJ is not available to XQuery update. Is it really like that? Otherwise, how can we write or delete things in the XML file? Another problem: when we want to show what has been changed for the cached XML file, I get this notification: '' According to the XQJ 1.0 Specification, executing expressions via XQPreparedExpression or XQExpression implicitly closes the previously created XQResultSequence object which was tied to the parent XQConnection object. To keep a XQResultSequence alive and accessible, you could either create an immutable XQSequence by using XQConnection.createSequence(XQResultSequence) or modify the XQStaticContext's Scrollability property to ensure that future XQResultSequence objects will be "SCROLLABLE" (cached) and not "FORWARD_ONLY" (streamed). Please read the XQJ.NET documentation for further details.' I understand what does it mean but do not quite understand how to use XQConnection.createSequence(XQResultSequence) or modify the XQStaticContext's Scrollability property. Could you kindly give me some guidance on that? My code is like:" XQPreparedExpression aaa =xqc.prepareExpression(.......); XQPreparedExpression bbb =xqc.prepareExpression(.......); XQResultSequence rs = aaa.executeQuery(); XQResultSequence as = bbb.executeQuery(); while(rs.next()) System.out.println(rs.getItemAsString(null)); System.out.println(as.getItemAsString(null));" Many thanks! Cong Liu

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BaseX Failing After a Number of Requests
by Jeremy Moseley 06 Dec '13

06 Dec '13

Hi Guys, We have implemented BaseX to provide a REST API to access specific information out of the database. Databases range in size from hundreds to 6000+ XML files, and the APIs use the attribute index to quickly locate nodes and return information about them. We have been noticing that BaseX has been randomly failing after a number of requests in the range of several hundred. I can replicate the failure in a few minutes by looping curl requests from the command line. The failure is made apparent by a valid request returning a Jetty 404 Error: HTTP ERROR 404 > > Problem accessing { redacted URL }. Reason: > > No function found that matches the request. > > ------------------------------ > *Powered by Jetty://* > This message is the same message that is thrown when requesting a URL that does not have a matching path, but this request is valid, and has been used before. It appears that the issue is the BaseX server failing somehow, but I can't track the reason. No information is logged at the time of the crash. If I connect to the BaseX server (on port 1984) using the basexclient, it connects, but reports that there are no databases available. Once I restart the service, I can reconnect, and it lists all databases as it should. Any ideas what might be causing these issues? Thanks, Jeremy

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BaseX Evaluation for Big Data
by Huband, Gary W *HS 06 Dec '13

06 Dec '13

I'm evaluating BaseX to use in a project that involves 10s of TB of xml data. Our goal is to be able to return a small amount of data from a query within a few seconds. Is BaseX capable of handling this much data? My initial evaluation of 1GB of data met our requirements. But, when I evaluated BaseX using about 20GB of data I get an out of memory message when I run a query. I'm running Windows 7 Pro on a Core i7, 8GB memory, and using the BaseX GUI. Thanks for your time Gary

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Re: [basex-talk] BaseX Evaluation for Big Data
by jean-marc Mercier 06 Dec '13

06 Dec '13

Hi Gary, Maybe you should wait for BaseX team members advises over this topic. Telling from my own experience, I can remember also having met some problem trying to insert 20 Gb of data into BaseX through the GUI. I had to achieve this into smaller steps, using batch commands (see http://docs.basex.org/wiki/Commands) in order to free memory. i.e. I first inserted the xml into 4 or 5 passes. Then created some indexes, etc...In that way it was possible to run the insertion, even with 4Gb machines. Hope this helps Jean-Marc 2013/12/6 Huband, Gary W *HS <GWH2SJ(a)hscmail.mcc.virginia.edu> > I still get an out of main memory when I try to create attribute indexes. > > I originally added the xml data with no indexes. > > Gary > > ________________________________ > From: jean-marc Mercier [jeanmarc.mercier(a)gmail.com] > Sent: Friday, December 06, 2013 9:37 AM > To: Huband, Gary W *HS > Cc: basex-talk(a)mailman.uni-konstanz.de > Subject: Re: [basex-talk] BaseX Evaluation for Big Data > > I meant I am NOT a baseX member ! sorry for the mistyping ! > > > 2013/12/6 jean-marc Mercier <jeanmarc.mercier(a)gmail.com<mailto: > jeanmarc.mercier(a)gmail.com>> > Hi Gary > > I am a BaseX team member, but have you sized up your JVM to run "Big Data" > ? > > See the files BaseX/basex*.bat. I am currently using set VM=-Xmx6g > > Hope this helps > > Jean-Marc > > > 2013/12/6 Huband, Gary W *HS <GWH2SJ(a)hscmail.mcc.virginia.edu<mailto: > GWH2SJ(a)hscmail.mcc.virginia.edu>> > > I'm evaluating BaseX to use in a project that involves 10s of TB of xml > data. Our goal is to be able to return a small amount of data from a query > within a few seconds. Is BaseX capable of handling this much data? > > My initial evaluation of 1GB of data met our requirements. But, when I > evaluated BaseX using about 20GB of data I get an out of memory message > when I run a query. > > I'm running Windows 7 Pro on a Core i7, 8GB memory, and using the BaseX > GUI. > > Thanks for your time > > Gary > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de<mailto: > BaseX-Talk(a)mailman.uni-konstanz.de> > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > > > >

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