BaseX-Talk

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Re: [basex-talk] Bug report and question
by Christian Grün 15 Oct '10

15 Oct '10

..thanks for your feedback. I have passed to pass this on to our mailing list, as it might be of general interest. > A bug report from me. I just decided to test that REST web services work > correctly. So I did the following: > 1. Opened window client, executed simple xquery to find a document by id: > /tagname[@id='id_value'] > 2. Removed this document via browser: > http://localhost:8984/basex/jax-rx/collection?command=delete+document.xml > 3. Repeated the same xquery execution in window client. > 4. Got the following stack trace: > [...] Note that the REST/JaxRx implementation starts a server instance of BaseX, which does not communicate with the GUI version of BaseX. As a result, and for the sake of performance, the changes performed via REST won't be reflected in the visual frontend. You shouldn't encounter any problems if you stay in one world, i.e., if you do all communication with REST, or the command-line client connecting to the server instance. > BTW, could you also say if your database was successfully used in Production > systems with heavy load? We have lots of users who operate BaseX in read-only environments, and we're continuously extending our support for scenarios that depend on stable realtime updates. Indeed, BaseX is very performant when it comes to updates – it's actually much faster than most competing systems we have tested by now – which is due to the fact that we have a very low updating overhead (no indexes are updated, no backups are performed for rollbacks, etc). Instead, BaseX includes manual features to rebuild your indexes and backup/restore the data. If you want to perform some tests on your workloads, I recommend to work with the latest version of BaseX (6.2.9), which included many fixes that have optimized the stability of our update operations. Along with the next official version, you'll get better documentation on the latest features. Advanced, optional update/transaction features to further minimize the danger of losing data are on our todo list. Hope this helps, Christian ___________________________ Christian Grün University of Konstanz Department of Computer & Information Science D-78457 Konstanz, Germany Tel: +49-7531-88-4449, Fax: +49-7531-88-3577 http://www.inf.uni-konstanz.de/~gruen > Hello, > > A bug report from me. I just decided to test that REST web services work > correctly. So I did the following: > 1. Opened window client, executed simple xquery to find a document by id: > /tagname[@id='id_value'] > 2. Removed this document via browser: > http://localhost:8984/basex/jax-rx/collection?command=delete+document.xml > 3. Repeated the same xquery execution in window client. > 4. Got the following stack trace: > > Error: Possible bug? Feedback is welcome: info(a)basex.org > BaseX 6.1: > java.lang.ArrayIndexOutOfBoundsException: 19 > org.basex.util.TokenSet.key(TokenSet.java:124) > org.basex.data.Data.name(Data.java:347) > org.basex.data.Serializer.node(Serializer.java:334) > org.basex.data.Nodes.serialize(Nodes.java:207) > org.basex.data.Nodes.serialize(Nodes.java:202) > org.basex.core.proc.AQuery.query(AQuery.java:88) > org.basex.core.proc.XQuery.run(XQuery.java:23) > org.basex.core.Proc.run(Proc.java:139) > org.basex.core.Proc.exec(Proc.java:109) > org.basex.gui.GUI.exec(GUI.java:428) > org.basex.gui.GUI$5.run(GUI.java:386) > > Shouldn't it be changed to some lenient notice about the document that has > been deleted? Or simply consider this exception case and exclude the > document from results? > > BTW, could you also say if your database was successfully used in Production > systems with heavy load? We're going to use an xml database in such kind of > application with about 50000 xml documents in database and about 20000 > update/delete/insert operations successively every day. We've already faced > an issue with eXist XML database that causes huge delays on removing a > single document from a large collection (this operation takes about 30 > seconds) due to the need to maintain indexes. > > Thanks in advance!

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There is a bug in the file 'BaseXClient.cs'
by Ramon F Herrera 14 Oct '10

14 Oct '10

(Thread was: "How to run the C# Binding examples?") Where it says: class Session class Query it should say: public class Session public class Query -RFH

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How to run the C# Binding examples?
by Ramon F Herrera 13 Oct '10

13 Oct '10

(Newbie Alert: both in BaseX and C#) Hello folks, I have been considering Java and C# for BaseX-based development. My Java experiments are going quite well. C##: First, I created 4 new blank projects in Visual Studio 2010 for the sample apps (BaseXClient.cs, CreateExample.cs, Example.cs, QueryExample.cs). After I added the references "System" and "Microsoft.CSharp" most of the errors went away, but there are 2 remaining: (1) The types "Session" and "Query" are not recognized. I am sure they are somehow part of BaseX. How do I add support for those types? It probably involves creating some reference and adding it, correct? (2) The other type that is not recognized is "Stopwatch". Microsoft provides one such class: http://msdn.microsoft.com/en-us/library/ebf7z0sw.aspx which has a "Start" method and a "ElapsedMilliseconds" property. That class is not recognized, however. I am using the provided source code, verbatim: https://svn.uni-konstanz.de/dbis/basex/trunk/api/etc/c%23/Example.cs Thanks again for such a great package! -Ramon

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How to run the C# Binding examples?
by Ramon F Herrera 13 Oct '10

13 Oct '10

Previous Post: ---------------------------------- C##: First, I created 4 new blank projects in Visual Studio 2010 for the sample apps (BaseXClient.cs, CreateExample.cs, Example.cs, QueryExample.cs). After I added the references "System" and "Microsoft.CSharp" most of the errors went away, but there are 2 remaining: (1) The types "Session" and "Query" are not recognized. I am sure they are somehow part of BaseX. How do I add support for those types? It probably involves creating some reference and adding it, correct? (2) The other type that is not recognized is "Stopwatch". Microsoft provides one such class: http://msdn.microsoft.com/en-us/library/ebf7z0sw.aspx which has a "Start" method and a "ElapsedMilliseconds" property. ---------------------------------- Please ignore the question above that refers to "Stopwatch". I solved that. The question that remains is about adding a reference to support "Session" and "Query". It sounds like all I need is a DLL. TIA, -Ramon

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How to run the C# Binding examples?
by Ramon F Herrera 13 Oct '10

13 Oct '10

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[BaseX 6.2.9 - BaseXWin] request after an 'updating' function declaration always returns root()
by Fabrice Etanchaud 12 Oct '10

12 Oct '10

Dear all, in BaseXWin 6.2.9, the execution of any request will always return root() when following the declaration of an 'updating' function. declare updating function local:update1($mark as element()) { if (false()) then () else () }; (: any request not returning root() :) /blablabli ---> root() removing 'updating' from the function declaration will give the expected answer. best regards, and thank you for your fantastic DBMS.

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Another question about the "QueryExample" tutorial app
by ramon＠patriot.net 09 Oct '10

09 Oct '10

The "QueryExample" app contains the following statement: String query = "for $x in doc('etc/xml/input.xml')//li return $x"; What is the semantics of that? Does it mean that the (potentially huge) file `input.xml' will be converted into a binary database every time that statement is executed? The above exemplifies a very common problem with XML query examples: The authors provide ONE step when we need TWO: (1) An initialization of the XML tree, done ONCE. (2) A retrieval statement, which is done MULTIPLE times. In short, let's say I have a binary database called "Input" (derived from `input.xml'). How can I refer to it in the QueryExample app? TIA, -Ramon ps: Sorry for the multiple posts before. The anti-spam feature is confusing.

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Suggestion about the tutorial examples
by ramon＠patriot.net 09 Oct '10

09 Oct '10

(Newbie alert) I just discovered BaseX. Congratulations and big thanks to the authors and all involved! I have been investigating a LOT of alternatives (programming languages, OSs, toolkits, etc.) and have concluded that the best approach for my application (XML read-only) is to use XPath (plus some XQuery). I have found some introductory examples written in C++ (Xerces) where the authors go through all kinds of complex convolutions to redirect the result of the XPath query to the screen. I hate to state the obvious, but we newbies do not want to send the XML elements to the screen. We rather assign them to some variable. That is the request I have. I think the application "QueryExample" and similar could use some way to assign the retrieved values to a variable. Thanks again! -Ramon (I am not in this mailing list)

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Suggestion about the tutorial examples
by ramon＠patriot.net 09 Oct '10

09 Oct '10

1 0

Suggestion about the tutorial examples
by ramon＠patriot.net 09 Oct '10

09 Oct '10

1 0

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