BaseX-Talk

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6 participants
5269 discussions

Re: [basex-talk] Why am I getting this error with the prolog statement
by Christian Grün 04 Oct '17

04 Oct '17

Hi Dave (cc to the list), > I am creating xml on an IBM mainframe. The code page used on mainframes > is defined as EBCDIC 0037. https://en.wikipedia.org/wiki/EBCDIC_037 As EBCDIC 0037 is limited to 256 characters, a simple mapping should suffice to convert your text to ISO-8859-1 (see the mapping table in the Wikipedia entry you referenced). It should be lightning fast, no matter if you do it in assembler or in XQuery. Hope this helps, Christian

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Why am I getting this error with the prolog statement
by Dave Day 02 Oct '17

02 Oct '17

Hello list. Another newbie question. I am creating a file in UTF-16, Big-endian. I am putting a 2 byte BOM sequence of x'FEFF' as the 1st two bytes, followed by a prolog statement identifying this as UTF-16 code. I then ftp this file to my desktop in binary to maintain the encoding. Below is a cut-n-paste of the 1st few bytes as it looks on the mainframe box. --------------------------- Ú.<?xml encoding="UTF-16" ?> FF46A9948989889877EEC6FF7466 EFCF743055364957EF436016F0FE The way the display is within ISPF, each byte has one character on two lines, so the 1st byte, FE should be read as col 1 of both lines, and so forth. When I try to create a new database I get the following from Basex. Command: CREATE DB d100217 :zxpf.ftp.download/apf1.v2r3.xmldata Error: "d100217.xml" (Line 1): Content is not allowed in prolog. Help greatly appreciated. Regards, Dave Day

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Moving on to Java 8!
by Christian Grün 28 Sep '17

28 Sep '17

Thanks everyone for your feedback! I got replies from users who are still stuck to older versions of the JRE (even Java 6 and, thus, BaseX 7.9 is still used), but it seems that the majority of you is looking forward to the upgrade. I am glad to report that the first Java 8 snapshot is available for testing now [1]. Please don’t hesitate to give it a try. Have fun, Christian [1] http://files.basex.org/releases/latest/

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Moving on to Java 8?
by Christian Grün 27 Sep '17

27 Sep '17

Dear all, Java 9 has just been released. As you may know, the BaseX code base is still compatible with Java 7, because version 7 is still used in the wild (we even got various user complaints when we upgraded from Java 6 just a few years ago). There are several reasons why we will move along to Java 8 in the near future: * It is more and more unsafe to use Java 7, because Oracle has stopped support two years ago. * From the developer point of view, there are only advantages when working with more recent versions of a software: newer language features and standard libraries can be used, the code base can be reduced, etc. * We would like to switch to the newest version of Jetty, which requires Java 8. Before we approach further, we are interested in hearing your reactions: Do you still work with Java 7? Would some of you require longtime support for Java 7? Thanks in advance and all the best, Christian

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BaseX continuous integration
by Tim Thompson 27 Sep '17

27 Sep '17

Hello, Does anyone have an example they could share of an app using the BaseX Unit Module deployed on a continuous integration server (preferably Travis CI)? Thanks in advance. Tim -- Tim A. Thompson Discovery Metadata Librarian Yale University Library

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Re: [basex-talk] pyBaseX url
by Bridger Dyson-Smith 26 Sep '17

26 Sep '17

Hi Andreas, On Sep 26, 2017 10:48, "Andreas Doering" <ado(a)zurich.ibm.com> wrote: Hello all, I want to use BaseX in a python environment and found PyBaseX by Luca Lilianas. Unfortunately, the email address associated with github does not seem to exist. What is not clear to me how the url has to be formatted. I tried 'http://localhost:1984:/rest/' but got timeouts. Have you tried 'http://localhost:1984/rest/'; e.g. removing the trailing ':'? I started a basexserver (with default port/user/password) and I can create and work with my example database with the the textual client from BaseX. But I could not find out how I have to format the url parameter so that the python interface works. I created a client by c = BaseXClient('http://localhost:1984:/rest/',default_database= None,user='admin',password='admin') c.connect c.create_database('TestName') The last line hangs in socket read. The log file does not show anything of that. Furthermore, it seems, that the current code in github is python2 specific, or maybe some package it depends on. I remember that during installation on python3 something broke, so I am using python2 in the moment. Any plans to port to python3? Regards, Andreas I can't speak to the python3 question, apologies. Best, Bridger

2 1

pyBaseX url
by Andreas Doering 26 Sep '17

26 Sep '17

Hello all, I want to use BaseX in a python environment and found PyBaseX by Luca Lilianas. Unfortunately, the email address associated with github does not seem to exist. What is not clear to me how the url has to be formatted. I tried 'http://localhost:1984:/rest/' but got timeouts. I started a basexserver (with default port/user/password) and I can create and work with my example database with the the textual client from BaseX. But I could not find out how I have to format the url parameter so that the python interface works. I created a client by c = BaseXClient('http://localhost:1984:/rest/ ',default_database=None,user='admin',password='admin') c.connect c.create_database('TestName') The last line hangs in socket read. The log file does not show anything of that. Furthermore, it seems, that the current code in github is python2 specific, or maybe some package it depends on. I remember that during installation on python3 something broke, so I am using python2 in the moment. Any plans to port to python3? Regards, Andreas

1 0

map behavior ?
by jean-marc Mercier 26 Sep '17

26 Sep '17

Hello BaseX team, It has been a while since I last wrote to this mailing list ! Happy to report again :) I have a strange behavior concerning map, it doesn't seem to sort as I expected. Is there any explanation ? let $map as map(xs:double,xs:string) := map:merge(( map:entry(xs:double(0.1), "Sunday"), map:entry(xs:double(5.0), "Thursday"), map:entry(xs:double(2.0), "Monday"), map:entry(xs:double(3.0), "Wednesday"), map:entry(xs:double(0.5), "Tuesday"), map:entry(xs:double(6.0), "Friday"), map:entry(xs:double(7.0), "Saturday") )) return $map output : map { 2: "Monday", 3: "Wednesday", 5: "Thursday", 6: "Friday", 7: "Saturday", 0.1: "Sunday", 0.5: "Tuesday" } Cheers

2 2

OutOfMemoryError at Query#more()
by Simon Chatelain 22 Sep '17

22 Sep '17

Hello, I am facing an issue while retrieving some big amount of XML documents from a BaseX collection. Each document (as an XML file) is around 10 KB, and in the problematic case I must retrieve around 70000 of them. I am using Session#query(String query) then Query#more() and Query#next() to iterate through the result of my query. try (final Query query = l_Session.query(“query”)) { while (query.more()) { String xml = query.next(); } } If there is more than a certain amount of XML document in the result of my query I get a OutOfMemoryError (full stack trace in attached file) when executing query.more(). I did the test with BaseX 8.6.6 and 8.6.7, Java 8, VM arguments –Xmx1024m Increasing the Xmx value is not a solution as I don’t know what the maximum amount of data I will have to retrieve in the future. So what I need is a reliable way of executing such queries and iterate through the result without exploding the heap size. I also try to use QueryProcessor and QueryProcessor#iter() instead of Session#query(String query). But is it safe to use it knowing that my application is multithreaded and that each thread has its own session to query or add elements from/to multiple collections? Moreover, for now all access to BaseX are done through a session, so my application can run with an embedded BaseX or with a BaseX server. If I start using QueryProcessor, then it will be embedded BaseX only, right? I also attached a simple example showing the problem. Any advice would be much appreciated Thanks Simon

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Server Variables, cached vars, etc
by Erik Peterson 21 Sep '17

21 Sep '17

How can I create a variable that is evaluated only once but accessed across many RestXQ requests and sessions. I'm trying to cache data that comes from an integration with an expensive operation. Does BaseX support something similar to server variables like Mark Logic?

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