BaseX-Talk May 2016

basex-talk@mailman.uni-konstanz.de

36 participants
36 discussions

Open Document spreadsheets and column position
by Graydon Saunders 24 May '16

24 May '16

Hi all -- So in Open Document Spreadsheets, columns with empty cells may be collapsed: <table:table-row table:style-name="ro2"> <table:table-cell table:number-columns-repeated="3" table:style-name="ce454" /> <table:table-cell table:style-name="ce255" /> <table:table-cell table:style-name="ce255" office:value-type="string"> <text:p>label</text:p> </table:table-cell> <table:table-cell table:style-name="ce255" office:value-type="string"> <text:p>description</text:p> </table:table-cell> <table:table-cell table:number-columns-repeated="4" table:style-name="ce455" /> </table:table-row> Not all of the rows have have these collapsed empty cells; in some rows, all the cells are present because they've got values in them. And while I wouldn't care in the example row, sometimes more than one table:table-cell represents a collapsed column in a position I care about. All the labels are in column D and all the descriptions in column E (in spreadsheet terms), whether all the table:cell elements are present in the XML representation of the sheet or not, and I need to reliably find them so as to be able to convince myself that the XSLT transform is getting correct answers. (The spreadsheet is about 40 MiB; not so much by recent list standards, but still more than I can hope to read. :) declare function local:realPos($current as node()) as xs:integer { (: the horror, the horror :) xs:integer(path($current) ! tokenize(.,'/')[last()] ! replace(.,'.*\[(\p{Nd}+)\]','$1') ! xs:integer( .) + sum($current/preceding-sibling::table:table-cell/@table:number-columns-repeated) - count($current/preceding-sibling::table:table-cell/@table:number-columns-repeated) ) }; works, in the sense of "will get the cell corresponding to the intended spreadsheet column even when some of the columns have been collapsed with @table:number-columns-repeated". It's horribly slow and it hurts just to look at, though, so -- is there a better way? (The XSLT transform pre-processes all the collapsed table:table-cell elements back into place, among other tidying. I'm not at all sure that's a better way with XQuery.) Thanks! Graydon

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Stopping the http server
by France Baril 24 May '16

24 May '16

Hi, A client of mine has multiple users who are able to start/stop the server. The issue though is that the person who starts the server is the only one who can stop it. Some research led to this site that explains how to use secret keys to allow for stopping the server http://www.eclipse.org/jetty/documentation/current/runner.html. Configuring stop You can configure a port number for jetty to listen on for a stop command, so you are able to stop it from a different terminal. This requires the use of a "secret" key, to prevent malicious or accidental termination. Use the --stop-port and --stop-key parameters as arguments to the jetty-runner: > java -jar jetty-runner.jar --stop-port 8181 --stop-key abc123> java -jar jetty-runner.jar --stop-port 8181 --stop-key abc123 Then, to stop jetty from a different terminal, you need to supply the same port and key information. For this you’ll either need a local installation of jetty, the jetty-maven-plugin <http://www.eclipse.org/jetty/documentation/current/jetty-maven-plugin.html>, the jetty-ant plugin <http://www.eclipse.org/jetty/documentation/current/ant-and-jetty.html#jetty…>, or write a custom class. Here’s how to use a jetty installation to perform a stop: > java -jar start.jar --stop-port 8181 --stop-key abc123 --stop> java -jar start.jar --stop-port 8181 --stop-key abc123 --stop In our case, Jetty is started through the BaseX start script. Is there any way we can use a secret key as explained above through the BaseX start/stop server scripts? Thanks! -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com

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add resource from client
by Gilad Wagner 24 May '16

24 May '16

Hi There, I need to load our db from a client xml, the problem is the server cannot reach the client so remote url is not an option. I think I need to use the -I/-i options, but I couldn't find documentation about how to use it. Can you show me a little example? Thank you! Gilad.

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Creating db in restxq interface
by Henning Phan 23 May '16

23 May '16

Hi, My question is how do you create a new database in restxq?When trying to create a db I get the error msg:HTTP Error 400[XUST0001] element constructor: no updating expression allowed.Some digging around and I learned that I might need the "updating" annotation though even after the change it gives the same error.My file looks like this now:=========== File start ================ declare %rest:path("/start") %updating %output:method("xhtml") %output:omit-xml-declaration("no") %output:doctype-public("-//W3C//DTD XHTML 1.0 Transitional//EN") %output:doctype-system("http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd") function page:hello() as element(Q{http://www.w3.org/1999/xhtml}html) { <html xmlns="http://www.w3.org/1999/xhtml"> <title>Good day Sir!</title> <link rel="stylesheet" href="static/w3.css"/> <time>The current time is: { current-time() }</time> <body class="w3-container"> <ul class="w3-navbar w3-green"> <li><a href="#">Home</a></li> <li><a href="#">Link 1</a></li> <li><a href="#">Link 2</a></li> <li><a href="#">Link 3</a></li> </ul> <ul>{ for $result in db:open('factbook')//continent/@name return <li>{ data($result) }</li> }</ul> <li> { db:create("test") } </li> </body> </html> =========== File End ================

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Querying Basex from a web interface
by Bram Vanroy | KU Leuven 22 May '16

22 May '16

Hello all I have been reading through many emails on this list and I've learnt a lot about how Basex works and how others use it. A month or so back I have sent an email myself to this list concerning caching. Even though I have some more questions about that, I will leave that for another time. Today I am concerned about retrieving chunked input from Basex. (Question also found on StackOverflow, with a nice bounty! :) http://stackoverflow.com/questions/36675388/efficient-and-user-friendly-way- to-present-slow-loading-results) Case at hand: we use Basex to query a 50 million tokens corpus. We also make this available to other users through a website. The thing is that this is slow. For our own projects that's no problem, we dive straight into the back-end and run a search command from terminal and let the query run for all the time it needs. However, for users it is paramount that they get a quick response. At the moment it is taking too long. I don't blame BaseX. We love BaseX and are astounded by its efficiency and optimisations! However, we want to deliver the best user-experience to our users. We call a new session from PHP, wait to receive the results, do some post-processing and then load the result page. As said, this takes too much time. We've been looking into some solutions. The best one that I think should be possible, is returning chunks of the results. Do you know those websites that allow you to see results but only, like, 20 per page? I think something similar is appropriate. When a user has searched for a pattern, we only show the 20 or so first results just so they can get an idea of the results they'd find. Then, when they click a button, we should query for the twenty next results which are then appended to the list (JavaScript solution I guess), and so on. Until all results have been found. Additionally, I will also provide a button from which users can download all results in a text file. This is allowed to take a longer time. The main thing is that users should get early feedback and results on their query. Now the question is if something like this is possible in an efficient manner in BaseX. Can you form a query that only finds the 20 first results, and then the following 20 and so on - and is this faster than searching everything at once? In other words, when I am searching for the results 120-140 (after having pushed the button a couple of times), is BaseX smart enough to skip the search space it has already done to find the 120 previous hits? If so, that would be great. Could you help me on my way, with some PHP/XQuery code that is suitable? I also highly encourage you to participate on StackOverflow. As I said, I am offering a 200 bounty - for the people who are interested in Internet fame. :) Thank you for your time Kind regards Bram Vanroy http://bramvanroy.be

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dba lags on replace resource
by Marco Lettere 22 May '16

22 May '16

Hi all, I have a single resource in a db. I perform several replace operations on that resource. The dba interface shows an increasing number of resources available in the db according to the number of replace operations performed. To get the count of resources back to 1 I need to optimize the database. When opening the database the visible content is however correct (showing the only one resource). Feels like dba is somehow lagging the information displayed with respect to the db content .... Regards, Marco.

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RESTXQ and xsd validation strangeness
by Marco Lettere 22 May '16

22 May '16

Dear all, this question triggers a dejavu in my head and I'm pretty sure this has been discussed some time ago so I'm not sure why it strikes back at us ... With the latest snapshot (but with 8.4.4 it's the same) downloaded just few minutes ago I start the basehttp server. Then I add the foolowing RestXQ to the restxq.xqm file: declare %rest:path("/testxsd") %rest:POST("{$body}") %rest:consumes("application/xml") function page:testxsd($body){ validate:xsd-info($body, "xsd.xsd") }; I store the following dummy xsd as xsd.xsd in the webapp folder: <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="a"/> </xs:schema> I invoke the restxq with: curl -vd "<a/>" http://localhost:5000/testxsd -H "Content-type:application/xml" Getting back the following error: Error 400 Stopped at /tmp/basex/webapp/restxq.xqm, 12/20: [bxerr:BXVA0002] Validation could not be started: Resource "/tmp/basex/POST.xml (No such file or directory)" not found.</title> This happens no matter what xml and what xsd is used. If I change $body with <a/> in the call to validate:xsd-info everything works smoothly ... Any ideas? Thanks, Marco.

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Re: [basex-talk] Faceted search
by Finney, Tim 22 May '16

22 May '16

Hi All, I would love to see faceted search capability. Sorry, but I can't offer sponsorship. Two things I would love to see in BaseX are faceted search capability (fast, index-based) and role-based security. Best, Tim Finney ------ Hi Greg, currently there is no out-of-the-box functionality, yet there is an EXPath Specification that handles facets: http://expath.org/spec/facet We have not yet implemented it in BaseX, but we might eventually if there is enough interest and maybe even a sponsor :-) Would that module cover your needs? Best Michael

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connection question
by Wang, Genneva 22 May '16

22 May '16

Hi basex gurus, One other question. We internally have connection pools of 20 connecting to basex. While trying to do performance stress test using Jmeter, we found out that if we submit more than the configured connection pool, say submit 30 connections, we noticed that the connection will not be recovered and the connection pool size will be in a un-recovereable stage (to pool size 0 eventually). I was just wondering does basex does any queueing on the receiving the incoming transactions, or is this something that the application needs to handle? Any tips would be greatly appreciated! Thank you very much. Regards, —Genneva

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Basex: basexhttp Failing to Start with "Server is running or permission was denied"
by Sovello Hildebrand Mgani 22 May '16

22 May '16

Hi! I have downloaded BaseX 8.4.4 and running it on Ubuntu 14.04[.4] I have added basex/bin to $PATH so I can be able to run basex, basexhttp ecc. I can successfully run basex and basexserver. RUnning the HTTP server fails with this message *$ basexhttp* [main] INFO org.eclipse.jetty.server.Server - jetty-8.1.18.v20150929 [main] INFO org.eclipse.jetty.webapp.StandardDescriptorProcessor - NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet [main] INFO / - Aliases are enabled! Security constraints may be bypassed!!! Server was started (port: 1984). [main] INFO org.eclipse.jetty.server.AbstractConnector - Started SelectChannelConnector@0.0.0.0:8984 HTTP Server was started (port: 8984). Server is running or permission was denied. Server was stopped (port: 1984). and the output when I run *$ basexhttp -d* DEBUG: true BaseX 8.4.4 [HTTP Server] [main] INFO org.eclipse.jetty.server.Server - jetty-8.1.18.v20150929 [main] INFO org.eclipse.jetty.webapp.StandardDescriptorProcessor - NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet [main] INFO / - Aliases are enabled! Security constraints may be bypassed!!! WEBPATH: /opt/oim/basex/webapp DEBUG: true Server was started (port: 1984). [main] INFO org.eclipse.jetty.server.AbstractConnector - Started SelectChannelConnector@0.0.0.0:8984 HTTP Server was started (port: 8984). java.net.BindException: *Address already in use* at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:387) at java.net.ServerSocket.bind(ServerSocket.java:375) at java.net.ServerSocket.bind(ServerSocket.java:329) at org.basex.BaseXHTTP$StopServer.<init>(BaseXHTTP.java:430) at org.basex.BaseXHTTP.<init>(BaseXHTTP.java:147) at org.basex.BaseXHTTP.main(BaseXHTTP.java:52) Server is running or permission was denied. Server was stopped (port: 1984). Which shows address is already in use. I only have apache2 and have run apache2 and tomcat earlier on the same laptop without issues, and I don't have any service that is listening on that port 8984. (I have tried running BaseX from version 8.0 and get the same errors). Am not sure what is not OK. Can you give me pointers to resolve this? Cheers -- :: Sovello Hildebrand Mgani :: --If you teach man to fish, you'll feed him a lifetime--

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BaseX-Talk May 2016