BaseX-Talk November 2014

basex-talk@mailman.uni-konstanz.de

35 participants
59 discussions

Easy to catch pattern?
by France Baril 10 Nov '14

10 Nov '14

Hi, For many reasons, we often encounter this pattern: 1) A process runs that tries to update the same .xml file twice within a single updating function. Or a writer may save a file or import a file from translation that is not well formed. Result: the .xml file is now saved as a raw file. 2) A second process (or the same process) tries to update that file again. Result: Improper user? Potential big? issue. Because we can't seem to catch the error on the 1st run (or maybe I'm trying the wrong way?), we might carry for a while without knowing that an issue occured. Then we get the second message, which is not very helpful because it doesn't help us catch the issue that caused the error. Would it be possible to improve the error handling on this issue, mostly to catch it on step 1? Here is a small test function to replicate the scenario. First call it with $x !='C' Then, change the test condition to $x = 'C' and call it again for the improper use error. *declare* %rest:path('tests/tries2') %rest:GET %output:method('html') %output:html-version('5.0') *updating* *function* *tries:controller2*(){ *try* { *for **$x* *in *('A', 'B', 'C') *return if* (*$x* != 'C') *then **db:replace*('en-us', 'test-updates.xml', <div>Hi!</div> ) *else *() } *catch* *** { (: This does not catch the issue in db:replace for a double update on the same file :) *db:replace*('en-us', 'errors.xml', <div *style*=*"color:red;"*> <h1>Error</h1> <p>{*$err:code*}: {*$err:description*}</p> <div>{*$err:value*}</div> </div>) } }; Regards, France -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com

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Re: [basex-talk] Use BaseX in embedded mode on tomcat
by Christian Müller 10 Nov '14

10 Nov '14

Hi again, I just noticed that this error only occurs in 8.0-Snapshot but not in the latest official release 7.9... Unfortunately I need the array module in my use case which was added in 8.0 Christian On Mon, Nov 10, 2014 at 9:14 PM, Christian Müller < christianmue1980a(a)gmail.com> wrote: > Hi all, > > I just want to ask shortly whether it is generally possible to run BaseX > in embedded mode within a webapp on tomcat? > > Using a very simple examle like this: > https://github.com/BaseXdb/basex/blob/master/basex-examples/src/main/java/o… > > Throws me an error on > Context context = new Context(); > > java.nio.file.FileSystemNotFoundException > at > com.sun.nio.zipfs.ZipFileSystemProvider.getFileSystem(ZipFileSystemProvider.java:171) > at > com.sun.nio.zipfs.ZipFileSystemProvider.getPath(ZipFileSystemProvider.java:157) > at java.nio.file.Paths.get(Paths.java:143) > at org.basex.util.Prop.homePath(Prop.java:142) > at org.basex.util.Prop.<clinit>(Prop.java:96) > at org.basex.core.GlobalOptions.<clinit>(GlobalOptions.java:20) > at org.basex.core.Context.<init>(Context.java:77) > at org.basex.core.Context.<init>(Context.java:69) > ........ > > The same code works great when executing locally (e.g. within JUnit > tests). Do you have any ideas? Is it generally possible or do I need to > deploy the war application? > > Thanks in advance, > Christian > > >

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Use BaseX in embedded mode on tomcat
by Christian Müller 10 Nov '14

10 Nov '14

Hi all, I just want to ask shortly whether it is generally possible to run BaseX in embedded mode within a webapp on tomcat? Using a very simple examle like this: https://github.com/BaseXdb/basex/blob/master/basex-examples/src/main/java/o… Throws me an error on Context context = new Context(); java.nio.file.FileSystemNotFoundException at com.sun.nio.zipfs.ZipFileSystemProvider.getFileSystem(ZipFileSystemProvider.java:171) at com.sun.nio.zipfs.ZipFileSystemProvider.getPath(ZipFileSystemProvider.java:157) at java.nio.file.Paths.get(Paths.java:143) at org.basex.util.Prop.homePath(Prop.java:142) at org.basex.util.Prop.<clinit>(Prop.java:96) at org.basex.core.GlobalOptions.<clinit>(GlobalOptions.java:20) at org.basex.core.Context.<init>(Context.java:77) at org.basex.core.Context.<init>(Context.java:69) ........ The same code works great when executing locally (e.g. within JUnit tests). Do you have any ideas? Is it generally possible or do I need to deploy the war application? Thanks in advance, Christian

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Origami - simple templating module
by Marc van Grootel 10 Nov '14

10 Nov '14

Hi, I've just uploaded a small templating module to https://github.com/xokomola/origami Currently tested for BaseX 8.0 beta b863b4f but I will test with the latest snapshot later. With this module I wanted to see if there's a better way to do simple templating in pure XQuery taking advantage of the higher order functions that XQuery 3.0 offers. At the moment it only provides very simple selectors like "*" (match every element), "@*" matches every attribute and simple named elements and attributes. At the moment it's BaseX specific but should be adaptable to other databases that support XQuery 3.0. Happy to receive comments and improvements. In an upcoming blog post I will provide some more info. --Marc

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stream binary responses from http:module
by Johan Mörén 10 Nov '14

10 Nov '14

Hi I have built a small client in XQuery that fetches zip files from another remote service using the http-module and stores them on disk with the help of the file-module. Some of the returned zip files are really large and BaseX seems to need to materialize the files in memory before writing them to disk resulting in out of memory errors for some files. Is there some way read the response in a more streamable fashion when using the http-module? I tried using the fetch:binary function successfully but i really need the more extended functionality of the http-module. #results in out of memory if the zip file is too large file:write-binary("file.zip", http:sendrequest(...)[2]) #works all the time. file:write-binary("file.zip", fetch:binary(...)) Regards, Johan

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Cross-platform deployment of BaseX
by David Leigh 10 Nov '14

10 Nov '14

I used BaseX in a Windows-only project a couple of years ago (ver 6.5 or some such thing). I found it to be excellent for rapid text queries. I'm planning on re-writing the application but would like it to be cross-platform and ideally in native binaries. I've had some "anti-Java" feedback that makes me want to see if there is a way to package/compile BaseX so that the Java is all "self-contained" in an executable(s) with no other dependencies. I think of how I understand sqlite to work and wonder if BaseX can be packaged in the same way. I see in the documentation that Maven is mentioned but I'm not really sure if that is what I'm looking for since I'm not familiar with Maven. I'm at the edges of my understanding of how a Java-based program can be packaged so please be gentle with my inexperience and ignorance. I guess the bottom line is that I'd like someone to be able to install my application on Windows, Linux or Mac without having to think about if they have Java installed on their machine or what version it is or anything. I also don't want to force someone to install Java on their machine if they specifically don't want to. Is that possible with BaseX? Thank you so much! --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com

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Tomcat - Multiple BaseX Services - Startup Problems
by Bridger Dyson-Smith 10 Nov '14

10 Nov '14

Hi all, I know that there aren't many Tomcat users on this list, and that I'm echoing previous emails to the list but I wanted to see if anyone here had encountered this issue. Some pieces of this may be steps forward to solving problems that others on the list have mentioned; I've cc'd you in the hopes that the information is helpful. Tomcat can be configured to multiple services, on varying ports, in the $TOMCAT_HOME/conf/server.xml file; e.g. [1]. I have two nearly-identical WARs in the following directory structure: $TOMCAT_HOME/ \__conf/ \__ [1] example server.xml: <Server port="8005" shutdown="SHUTDOWN"> <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on"/> <Listener className="org.apache.catalina.core.JasperListener"/> <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/> <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/> <GlobalNamingResources> <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml"/> </GlobalNamingResources> <Service name="Catalina"> <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" maxThreads="125" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" acceptCount="100"/> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/> <Engine name="Catalina" defaultHost="localhost"> <Realm className="org.apache.catalina.realm.LockOutRealm"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> </Realm> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true"> <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t "%r" %s %b"/> </Host> </Engine> </Service> <Service name="Catalina2"> <Connector port="18080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="18443"/> <Connector port="18009" protocol="AJP/1.3" redirectPort="18443"/> <Engine name="Catalina2" defaultHost="localhost"> <Realm className="org.apache.catalina.realm.LockOutRealm"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> </Realm> <Host name="localhost" appBase="webapps2" unpackWARS="true" autoDeploy="true"> <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs2" prefix="localhost_Cat2_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b"/> </Host> </Engine> </Service> </Server>

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Executing commands on Nov 6 snapshot
by Carl Leitner 10 Nov '14

10 Nov '14

Hi, Is anyone experiencing difficulties in the Nov 6 snapshot with running commands like: basex -Vc “create database junk" where I get output like: Stopped at , 1/7: Syntax: CREATE [BACKUP|DATABASE|EVENT|INDEX|USER] [...] Create database, index, user, backup or event. Creates a new database, index, user, backup or event: - BACKUP [name]: creates a backup of the database [name] - DATABASE [name] ([input]): creates the database [name] with an optional [input] - EVENT [name]: creates the event - INDEX [TEXT|ATTRIBUTE|FULLTEXT]: creates the specified index - USER [name] ([password]): creates the specified user This has been tried on a couple of machine (Ubuntu, Mac OS X, CentOS) including clean installs. It does not happen with the Oct 28 snapshot. Cheers. -carl

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Dynamic Evaluation of XQUERY
by Mansi Sheth 10 Nov '14

10 Nov '14

Hello, I want to devise a generic xquery script, which accepts actual XPATH to be run across all documents in all databases, from command line. Something like: curl -i " http://localhost:8984/rest?run=get_query_result.xq&n=/root/*//calls/@name/s… " Basically, parameter "n" would hold the query. I am trying this using xquery module eval method. But, am not succeeding in it. I have my script something as under: declare variable $n as xs:string external; declare option output:item-separator "
"; let $aList := for $db in db:list() let $vars := map {'db_name':$db , 'query' : $n} let $query_to_execute := "db:open($db_name)$query" return xquery:eval($query_to_execute,$vars) return distinct-values($aList) My questions are: 1. Can we assign dynamic values as a value to a map's key ? 2. Can I map have more than one key, in query:eval ? Please point me in right direction, or explain what am I doing wrong in above code .. - Mansi

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unexpected behaviour
by Rob Stapper 08 Nov '14

08 Nov '14

Hi, Running the attached program produces the next evaluation. Evaluating: - elementSeq: <A ref="var1"><B><X1/></B></A> - content0: <X1/> - content2: <X1/> - elementSeq: <A ref="var1"><B><X2/></B></A> - content0: <X2/> - content2: <X1/> I can't explain the value of the last "- content2: "-trace. I expect it to be the same value as the last "- content0: "-trace. What's happening here? - Rob Stapper --- Dit e-mailbericht bevat geen virussen en malware omdat avast! Antivirus-bescherming actief is. http://www.avast.com

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BaseX-Talk November 2014