BaseX-Talk

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6 participants
5269 discussions

IDs management
by Ioan Fericel 17 Nov '14

17 Nov '14

Hello all, I would like to ask your advice on the best practice to use the IDs in BaseX, somewhat in the classic style of relationships between records in different nodes or documents. I have not found a simple way to create autoincrement IDs, and indexes generated by BaseX I understand that it's possible to suffer changes in case of optimization actions or database recovery. So I can not count on them. I try to do it using attributes as unique identifiers in repetitive elements, like: <products> . . . <product id="123" name="abc" description="xyz"/> <product id="124" name="bbbb" description="xxxxxxx"/> </products> <product-template> <product id="" name="" description="" ... /> </product-template> When adding a new product, I need to calculate the max from products/product/@id, incremented by 1 and replaced with this value (125) the id of the product template. After that, the updated product template should be inserted in the node products. I try to do all this in a single restxq function, in many ways, but fail. Please give me, first, an general idea of how the problem should be approached in working with BaseX. Many thanks, Ioan

3 3

Connecting to BaseX with PHP client
by Paul Swennenhuis 17 Nov '14

17 Nov '14

Hi, I have successfully deployed BaseX on an Amazon Web Services instance using the "Elastic Beanstalk application container" and the BaseX79.WAR distribution. The REST interface works as is demonstrated by going to http://drpbasex2.elasticbeanstalk.com/rest/?run=xq/countries.xq&country=^a Now I try to connect to BaseX using the PHP implementation of a BaseX Client (BaseXClient.php). I can't figure out what connection parameters to use though. For "host" I tried drpbasex2.elasticbeanstalk.com (the web address), ec2-54-93-168-77.eu-central-1.compute.amazonaws.com (used for SSH connecting) and 54.93.168.77 (the public IP address Amazon Web Services indicates for this instance) For "port" I tried 1984 (default) and 8984 For "user" and "password" I used the BaseX defaults (admin/admin) I tried any combination of the above parameters but I always get an "can't connect to targe computer" in the socket_connect() line of BaseXClient.php (running from localhost) I can think of a number of reasons why the connection is refused: Credentials Should the credentials be something different from admin/admin? Should I maybe actively set credentials for the REST interface in web.xml? Inbound ports In the BaseX instance on Amazon Web Services(AWS) I can configure ports for inbound traffic, for example port 22 for SSH access. It might be needed to allow access for port 1984 or 8984, but the only way to do that is to use a 'Custom TCP' protocol. I already did that and it makes no difference. What protocol should be used? No connection allowed from localhost? Maybe connecting from localhost is not allowed? Any help pointing me in the right direction is appreciated. Paul

1 1

Origimi 0.3: Extractors
by Marc van Grootel 17 Nov '14

17 Nov '14

Hi, I just tagged the code for Origami as 0.3 (https://github.com/xokomola/origami) In this 'release' I added Extractors. With these you can build node extraction functions from composable selectors. This still doesn't make Origimi a full templating library but it's starting to be useful, for example, for screen-scraping HTML as I will show in an upcoming blog post. I did have to let go of BaseX 7.9 compatibility which means it now only runs on recent snapshots (I tested on yesterday's snapshot). It may work on older snapshots but I do not know which. Welcome to the cutting edge ;-) Happy to receive comments and improvements. --Marc

1 0

fn:outermost bug?
by Marc van Grootel 16 Nov '14

16 Nov '14

Hi, I think I bumped into a bug (on 8.0 snapshot) let $input := <ul> <li id="first">item 1</li> <li>item 2</li> <li id="last">item 3</li> </ul> return outermost(( $input//li[@id = 'last'], $input//li, $input//li[@id = 'first'] )) => <li id="first">item 1</li> <li>item 2</li> <li id="last">item 3</li> <li id="last">item 3</li> <li id="last">item 3</li> This is in document order but duplicates are not eliminated. The same happens with fn:innermost. According to the spec[1] "takes as input a sequence of nodes, and returns every node within the sequence that does not have another node within the sequence as an ancestor; the nodes are returned in document order with duplicates eliminated." [1] http://www.w3.org/TR/xpath-functions-30/#func-outermost --Marc

2 3

http PUT
by pw＠themail.co.uk 13 Nov '14

13 Nov '14

Hello list is there an http "PUT" function in BaseX? Thanks Peter

3 2

Re: [basex-talk] stream binary responses from http:module
by Christian Grün 12 Nov '14

12 Nov '14

Hi Johan, thanks for replying. I don't know if it's still relevant to you, but… > The main features was authentication Did you also try to specify the credentials in the URL (via http://name:password@...)? > and the ability to control headers of > the request and response. Do you have more information on that requirement? Christian On Tue, Nov 11, 2014 at 10:17 PM, Johan Mörén <hutchkintoot(a)gmail.com> wrote: > Hi Christian! > > The main features was authentication and the ability to control headers of > the request and response. > > Regards, > Johan > > On Mon, Nov 10, 2014 at 3:00 PM, Christian Grün <christian.gruen(a)gmail.com> > wrote: >> >> Hi Johan, hi Florent, >> >> Maybe 8 months ago, I have opened a new issue for extending HTTP >> client functionality in BaseX. The main requirement was that HTTP >> responses should be streamable. As HTTP responses are currently >> returned as elements, it is not possible (at least in BaseX) to >> include streamable sub elements. We could either… >> >> * provide HTTP client functions that only return the body itself, or >> * wrap all results in maps and arrays. >> >> In both cases, we could avoid wrapping binary items as Base64, which >> would save us both memory and processing time. >> >> My questions to you guys are: >> >> @Florent: Have you thought about using maps and arrays in a new >> version of the HTTP Client spec? >> >> @Johan (in case you remember): What HTTP client features do you need >> that prevent you from using the fetch:binary function? >> >> Thanks in advance, >> Christian >> >> [1] https://github.com/BaseXdb/basex/issues/914 >> >> >> >> On Fri, Mar 28, 2014 at 5:31 PM, Christian Grün >> <christian.gruen(a)gmail.com> wrote: >> > Hi Florent, >> > >> >> Is there any intrinsic difference, from an implementation point of >> >> view, in the context of streamability of the returned content, between >> >> a function returning always an xs:base64Binary item, and another one >> >> returning sometimes an xs:base64Binary item, sometimes a string, and >> >> sometimes a document node? >> > >> > Yes there is, at least in our architecture: a specific function will >> > always be streamable or not [1]. This static distinction is necessary >> > because various optimizations rely on it. >> > >> > I remember you talked about a second version of the HTTP Client >> > Module... Have you thought about removing the "magic parts" of the spec >> > and provide explicit functions for retrieving binary or string data, >> > similar to the EXPath Archive and File Modules? >> > >> >> I am pretty sure Adam implemented streaming for the HTTP Client in >> >> eXist, so it might be interesting to have a look there as well. >> > >> > Sounds interesting, but I couldn't find any hints in their >> > documentation. Do you have any reference that confirms this >> > assumption? Or some general info on how streamable results are handled >> > in eXist? What about the first http:response item, do you know if it >> > will also be streamed? >> > >> > Best, >> > Christian >> > >> > [1] http://docs.basex.org/wiki/Streaming_Module > >

1 0

Benutzung von LDAP-Autorisation in BASEX
by Michael Otto 12 Nov '14

12 Nov '14

Hallo. Zum Betrieb einer RESTXQ webapp wurde mir die Authentifikation mit LDAB nahe gelegt. Mit der BASEX-Dokumentation komme ich nicht wirklich weiter... Existiert eine Anleitung für Laien? Vielen Dank im Voraus Michael Otto

2 1

Fwd: Use BaseX in embedded mode on tomcat
by Christian Müller 11 Nov '14

11 Nov '14

Hi Christian, thanks for your answer. You are perfectly right, there was another (stupid) mistake by myself which crashes the execution but was closely related to the printed and caught exception. Now it works as expected. Thanks again! Christian On Mon, Nov 10, 2014 at 9:50 PM, Christian Grün <christian.gruen(a)gmail.com> wrote: > Hi Christian, > > thanks for the observation. With 8.0, we switched to Java 7 and > java.nio, so it could be that the check for finding the application > directory fails. > > I just looked at the stack trace, and I wondered if the error does > really break your code, or if it simply output to stderr (due to the > catch clause, see [1])? > > Feedback from other Tomcat users is appreciated, > Christian > > [1] > https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/b… > > > > On Mon, Nov 10, 2014 at 9:29 PM, Christian Müller > <christianmue1980a(a)gmail.com> wrote: > > 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 > >> > >> > > >

2 1

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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