BaseX-Talk

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9 participants
5241 discussions

Multiple 'LocalSessions' with their own opened database
by Fabrice Etanchaud 14 Jan '11

14 Jan '11

Dear all, In Standard mode (Standalone server) Is it possible to have several 'LocalSessions', each with a possible different opened database ? I noticed that for each ClientSession, BaseXServer creates a child context. So in Standalone mode, is it possible to do the same and pass a child context to each LocalSession in order to run multiple queries on distinct databases at the same time ? BaseX is simply fantastic. Best regards, Fabrice Etanchaud

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Users and Permissions when running BaseX locally
by Fabrice Etanchaud 14 Jan '11

14 Jan '11

Dear all, just to be sure of what I am doing... Are Users and Permissions stuff meaningless when running BaseX locally (as a library, I mean) ? Best regards, Fabrice Etanchaud

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What happened to the DeepFS menu? Was it removed?
by dmccordjr＠yahoo.com 14 Jan '11

14 Jan '11

Hello I was wondering, What happened to the DeepFS Menu in the latest Trunk. Will it be returning? How can I create a DeepFS Database. I've started to learn BaseX. Currently, I use DeepFS like a Disk catalog. Was it somehow broken? If so. What is the ChangeSet of 6.1? I'm a Java Dev. So if you can point me in the right direction. I would Appreciate it. Thank you in advance.

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Performance issues
by William Sandri 12 Jan '11

12 Jan '11

Hello, we are experiencing a weird performance issue in function calling. In many xqueries we use, we found that calling functions slows down the execution, sometimes it even hangs "forever". I tried to drill down to the problem and I think I isolated an odd behavior. Before presenting the example code, let me summarize a little bit: inside a for-loop we call a thousand times a function passing some parameters. I declared 3 functions, 2 of which take 1 parameter and the last one takes 2 parameters. For simplicity's sake the parameter "objectId" is never used, but that doesn't affect the experiment. When I call any of the 1-parameter functions, execution takes less than 2 seconds, but when I call the 2-parameter function it runs endlessly. It seems that the combination of those two parameters is the point of performance issue. I hope you can illuminate me. Regards William Here it is an example: declare namespace xbpr = "http://www.bpeng.com/"; declare variable $amlDocName as xs:string :="aml"; declare variable $cxnDefsDocName as xs:string :="cxnDefsDocName"; declare function xbpr:testFast1($objectId as xs:string?){ let $docName := $cxnDefsDocName let $conn_typeof_target := doc($docName)/CxnDefs/CxnDef[@type="RdfsType"]/@target return $conn_typeof_target }; declare function xbpr:testFast2($docName as xs:string?){ let $conn_typeof_target := doc($docName)/CxnDefs/CxnDef[@type="RdfsType"]/@target return $conn_typeof_target }; declare function xbpr:testSlow($docName as xs:string?, $objectId as xs:string?){ let $conn_typeof_target := doc($docName)/CxnDefs/CxnDef[@type="RdfsType"]/@target return $conn_typeof_target }; let $instances := doc($amlDocName)/AML/Group//ObjDef for $instance in $instances let $objectId := $instance/(a)ObjDef.ID let $v := xbpr:testFast1($objectId) let $v := xbpr:testFast2($cxnDefsDocName) let $v := xbpr:testSlow($cxnDefsDocName, $objectId) return $v

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Re: [basex-talk] Database creation from a directory tree
by Andreas Weiler 06 Jan '11

06 Jan '11

Hi David, just surround the command with quotes: java -cp BaseX.jar org.basex.BaseXClient -c "set createfilter *" Kind regards, Andreas Am 06.01.11 20:06, schrieb David leigh: > > Andreas, > > I spoke too soon about my success. > > If I do: > > set createfilter * > > from an */interactive/* commandline, it works. > > If I do the same thing as a */passed command/* it does NOT work, BUT a > passed command is accepted if I do: > > set createfilter '*' > > Unfortunately the filter is then incorrect! > > Here's my results from the DOS console: > > */C:\Users\David\Documents\OpenSong\OpenSongSearch\BaseX>java -cp > BaseX.jar org.basex.BaseXClient -Uadmin -Padmin -c set createfilter */* > > */Error: Stopped at line 1, column 24:/* > > */Syntax: SET [option] ([value])/* > > */ Set global options (current values: try 'info')./* > > *//* > > */Available options [option] with value [value] = on/off:/* > > */- QUERYINFO: Display of query info/* > > */- DEBUG: Display of debug info/* > > */- SERIALIZE: Serialization of query results/* > > */- CHOP: Chopping of XML whitespaces/* > > */- ENTITY: Parsing of XML entities/* > > */- TEXTINDEX: Text indexing/* > > */- ATTRINDEX: Attribute value indexing/* > > */- FTINDEX: Full-text indexing/* > > */- PATHINDEX: Path indexing/* > > *//* > > */C:\Users\David\Documents\OpenSong\OpenSongSearch\BaseX>java -cp > BaseX.jar org.basex.BaseXClient -Uadmin -Padmin/* > > */BaseX 6.3.5 [Client]/* > > */Try "help" to get more information./* > > *//* > > */> set createfilter */* > > */CREATEFILTER: */* > > */>/* > > So, I'm stuck again as it appears that the parser for the "-c" option > on the command line is slightly different from the command parser on > the interactive command line. Is there another way to do this? > > Thanks! > > David > > DavidEmailSig <mailto:david@leighweb.com> > > *From:*Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] > *Sent:* Friday, December 31, 2010 04:41 PM > *To:* david(a)leighweb.com > *Subject:* Re: [basex-talk] Database creation from a directory tree > > Hi David, > > thanks a lot for your tests. > I couldnt fix the gui bug yet...but i can help you with command line... > > There is a createfilter option...it can be set with: > set createfilter * > > so all files in the folder are recognized for creating a database. > > I hope this works for now, > Happy new year, > Andreas > > Am 31.12.10 15:13, schrieb David leigh: > > Andreas, > > I just did an interesting test (using the version that the windows > installer installs: 6.3.4). > > I copied my directory tree of files and in the new copy, I gave all my > data files an extension of "xml" (previously they had NO extension). > NOW, both with the command line and the GUI, the full database is > created without any problem. To double check, I went back to the old > directory with no extensions and created a new database using a filter > of "*.*" and only 14 documents were created in the database (instead > of 5000+). > > Conclusions: > > In the command line you must have input documents with an extension of > "xml" since there is no visible way to provide a filter. > > The GUI interfaces differently than the command line with the basex > core since it can receive a filter as well as a path in the database > creation process > > The GUI filter functionality in 6.3.4 is different than in 6.1...for > me it is "broken" vs. how it works in 6.1 > > So, I think for my project to work completely, I need new > functionality: a file name filter that works correctly on the CREATE > DB statement in the command line interface. Does this sound correct > to you? > > Unfortunately, I don't have control over the extension names of my > input files as they are created by another piece of software. Until > I can do a create database in the command line, I'll have to do manual > gui-based (6.1 version) refreshes of the data or some sort of long > copy/rename process in the background. > > Thanks! > > David > > DavidEmailSig <mailto:david@leighweb.com> > > *From:*Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] > *Sent:* Wednesday, December 29, 2010 11:26 AM > *To:* david(a)leighweb.com <mailto:david@leighweb.com>; > BaseX-Talk(a)mailman.uni-konstanz.de > <mailto:BaseX-Talk@mailman.uni-konstanz.de> > *Subject:* Re: [basex-talk] Database creation from a directory tree > > Hi David, > > the syntax of the create command changed between the releases of 6.1 > and 6.3.4. > > In release 6.1 you have to use: > > create db C:\Users\David\Documents\OpenSong\songpacks\Songs songs > > Kind regards, > Andreas > > Am 28.12.10 18:00, schrieb David leigh: > > Here are my command line results from 6.3.4: > > C:\Users\David\Documents\OpenSong\OpenSongSearch\BaseX>java -cp > BaseX.jar org.basex.BaseXClient -Uadmin -Padmin > > BaseX 6.3.5 [Client] > > Try "help" to get more information. > > > drop db songs > > Database 'songs' was dropped. > > > create db song > > Database 'song' created in 1683.61 ms. > > > info index > > Tags > > - Structure: Hash > > - Entries: 0 > > Attributes > > - Structure: Hash > > - Entries: 0 > > Text Index > > - Structure: Binary tree > > - Size: 4 Bytes > > - Entries: 0 > > Attribute Index > > - Structure: Binary tree > > - Size: 4 Bytes > > - Entries: 0 > > Full-Text Index > > - Not available > > Path Summary > > doc() 1x > > > info table > > Stopped at line 1, column 10: > > Syntax: INFO ([DATABASE|INDEX|STORAGE]) > > Show information on current database. > > Shows information on the currently opened database: > > - no argument: show global information > > - DATABASE: shows database information > > - INDEX: shows index information > > - STORAGE [start end] | [query]: show internal database table > > > info storage > > PRE DIS SIZ ATS NS KIND CONTENT > > ------------------------------------- > > 0 1 1 1 0 DOC song > > > info > > General Information > > Database Path: C:\Users\David\Documents\OpenSong\OpenSongSearch\BaseX\data > > Used Main Memory: 895 KB > > Database Creation > > Whitespace Chopping: ON > > Entity Parsing: OFF > > Indexes > > Path Summary: ON > > Text Index: ON > > Attribute Index: ON > > Full-Text Index: OFF > > > > > So, for 6.3.4, it creates from the command line, but it's empty. The > root of that path has NO files in it. The 5861 files are in all the > subdirectories. > > Then, when I try the same syntax with 6.1, I get the following results: > > > create db songs C:\Users\David\Documents\OpenSong\songpacks\Songs > > Stopped at line 1, column 17: > > Syntax: CREATE [DB|COLL|FS|INDEX|USER] [...] > > Create database, index or user. > > Creates a new database, index or user: > > - DB [path] [name?]: > > creates the database [name] for the file or directory [path] > > - COLL [name]: > > creates an empty database [name] > > - INDEX [TEXT|ATTRIBUTE|FULLTEXT|PATH]: > > creates the specified index > > - FS [path] [name] ([mountpoint] [backingstore]): > > creates filesystem database [name] for [path] > > (using [mountpoint] and [backingstore] if FUSE is activated) > > - USER [name] [password?]: > > creates the specified user > > Summary: > > 6.1 GUI -- works as I want it > > 6.1 command line -- can't get it to create > > 6.3.4 GUI -- creates but with only 14 entries > > 6.3.4 command line -- creates, but it's empty > > I don't mind staying with 6.1, but I DO want to do everything with the > command line. > > Is the ADD syntax the same, in that I can simply specify the path and > it will recurse the whole directory tree? > > Thanks!!! > > David > > DavidEmailSig <mailto:david@leighweb.com> > > *From:*Andreas Weiler [mailto:andreas.weiler@uni-konstanz.de] > *Sent:* Tuesday, December 28, 2010 01:29 PM > *To:* david(a)leighweb.com <mailto:david@leighweb.com> > *Cc:* basex-talk(a)mailman.uni-konstanz.de > <mailto:basex-talk@mailman.uni-konstanz.de> > *Subject:* Re: [basex-talk] Database creation from a directory tree > > Additional question: That was in the GUI. I'd like to do the same > thing using the command line with the .JAR file, but somewhere my > syntax is not right. Additionally, all the XML files have NO > EXTENSION so I don't know how to specify that either in the > command line. So, any help in that area would also be appreciated. > > > Could you provide your syntax? > > The syntax should be: > create db dbname path/to/folder > > The missing extension shouldnt be a problem, i just tested it. > > > > > In the GUI in 6.1, I can create a database from a whole directory > hierarchy of 5,681 individual XML files. When I point to the same > source file directory and using the 6.3.4 GUI (which I installed with > a pre-release version of the installer), it only processes 14 files. > No error message (that I saw) was produced. The behavior that I'm > wanting is what 6.1 does. Glad to help in solving the problem. > > We will check for modifications between the releases. As quick > workaround you could try to create an empty database and then add the > documents with the Database/Add documents menu. > > Kind regards, > Andreas > > Am 28.12.10 12:55, schrieb David leigh: > > I've just installed 6.3.4 and I've noticed a difference from version 6.1. > > In the GUI in 6.1, I can create a database from a whole directory > hierarchy of 5,681 individual XML files. When I point to the same > source file directory and using the 6.3.4 GUI (which I installed with > a pre-release version of the installer), it only processes 14 files. > No error message (that I saw) was produced. The behavior that I'm > wanting is what 6.1 does. Glad to help in solving the problem. > > Additional question: That was in the GUI. I'd like to do the same > thing using the command line with the .JAR file, but somewhere my > syntax is not right. Additionally, all the XML files have NO > EXTENSION so I don't know how to specify that either in the command > line. So, any help in that area would also be appreciated. > > Thank you, > > David > > DavidEmailSig <mailto:david@leighweb.com> > > > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de <mailto:BaseX-Talk@mailman.uni-konstanz.de> > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

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Read block? Kill me now.
by Charles F. Munat 06 Jan '11

06 Jan '11

So I went live with my embedded Base-X website and that has been a very painful learning experience. I had been opening the DB on each request and running various queries, but assumed that the process would close it when it exited. That was bad, bad, bad. About an hour after I uploaded the new site (and after I'd gone to bed for a nine hour snooze), the site started serving a 500 error code because too many files were open. OK, figured that out. So I created a singleton and with a method that opens the database in a try/catch block, and closes it in the finally block. Problem solved. Sort of. Apologies for the Scala, but here is the singleton code: object DB { private val context = new Context() new org.basex.core.cmd.Set("dbpath", "/var/www/db").execute(context) def executeQuery(query: String): String = { try { new Open("data").execute(context) new XQuery(query).execute(context) } catch { case _ => new CreateDB("data", "<data/>").execute(context) new XQuery(query).execute(context) } finally { new Close().execute(context) } } } Try blocks in Scala return a value, so this method returns the output of the passed-in XQuery. Works like a charm. When a request is received, my servlet (using Circumflex, a Scala web framework) creates a new RequestRouter class. A "get" method is called and passed the URL. Here is that class and method, which shows how I am calling the above DB object: class Main extends RequestRouter { get(url) = { val query = Rx.getQuery(url) val output = DB.executeQuery(qry) "<!DOCTYPE html>\n" + output } } This passes the URL (url) to a method on another singleton (Rx.getQuery) which returns an XQuery based on the URL. That query is passed to DB.executeQuery which stores the output in the immutable variable "output." I then prepend a doctype and serve it as text/html. This runs great... for about an hour. Then the server stops responding altogether. I've searched the logs, and I found this error: java.io.IOException: Stream Closed java.io.RandomAccessFile.seek(Native Method) org.basex.io.TableDiskAccess.readBlock(TableDiskAccess.java:349) org.basex.io.TableDiskAccess.cursor(TableDiskAccess.java:326) org.basex.io.TableDiskAccess.read1(TableDiskAccess.java:92) org.basex.data.Data.kind(Data.java:305) org.basex.query.item.DBNode$4.next(DBNode.java:273) org.basex.query.path.IterStep$1.next(IterStep.java:45) org.basex.query.path.AxisPath.iter(AxisPath.java:437) org.basex.query.path.AxisPath.iter(AxisPath.java:406) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.For$1.init(For.java:127) org.basex.query.expr.For$1.next(For.java:92) org.basex.query.expr.FLWR$1.next(FLWR.java:63) org.basex.query.expr.Constr.<init>(Constr.java:53) org.basex.query.expr.CElem.item(CElem.java:112) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:49) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.FLWR$1.next(FLWR.java:67) org.basex.query.iter.Iter.finish(Iter.java:65) org.basex.query.expr.ParseExpr.value(ParseExpr.java:73) org.basex.query.expr.Func.iter(Func.java:80) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.FuncCall.iter(FuncCall.java:76) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.TypeCase.iter(TypeCase.java:95) org.basex.query.expr.TypeSwitch.iter(TypeSwitch.java:74) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.Constr.<init>(Constr.java:52) org.basex.query.up.Replace.item(Replace.java:50) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:49) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.ParseExpr.value(ParseExpr.java:73) org.basex.query.expr.GFLWOR.iter(GFLWOR.java:298) org.basex.query.expr.GFLWOR.iter(GFLWOR.java:291) org.basex.query.expr.GFLWOR.iter(GFLWOR.java:266) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.ParseExpr.value(ParseExpr.java:73) org.basex.query.up.Transform.iter(Transform.java:86) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.FLWR$1.next(FLWR.java:67) org.basex.query.iter.Iter.finish(Iter.java:65) org.basex.query.expr.ParseExpr.value(ParseExpr.java:73) org.basex.query.expr.Func.iter(Func.java:80) org.basex.query.QueryContext.iter(QueryContext.java:306) org.basex.query.expr.FuncCall.iter(FuncCall.java:76) org.basex.query.QueryContext.iter(QueryContext.java:306) I'm guessing that this is some sort of race condition? What is the trick to using Base-X in embedded mode? Do I need to be doing some sort of threading here? (I have managed to avoid learning anything about threads for 15 years now. Hate to ruin that record.) Suggestions? Advice? At this point I'm seriously thinking of just running Base-X as a server and connecting through a connection pool, but I have to figure that out tonight, so if there's an easier answer, I'd sure love to know it. Thanks again for all your help! Chas.

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Fwd: Re: Fwd: Re: How to retrieve HTTP request parameters and use them in XQuery with BaseX
by Andreas Weiler 05 Jan '11

05 Jan '11

-------- Original-Nachricht -------- Betreff: Re: [basex-talk] Fwd: Re: How to retrieve HTTP request parameters and use them in XQuery with BaseX Datum: Wed, 5 Jan 2011 09:51:07 +0000 Von: software developer <computer.software.developer(a)gmail.com> An: Andreas Weiler <andreas.weiler(a)uni-konstanz.de> Hi Andreas, Wonderful, thanks a lot!! Great work. On Mon, Jan 3, 2011 at 10:02 AM, Andreas Weiler <andreas.weiler(a)uni-konstanz.de <mailto:andreas.weiler@uni-konstanz.de>> wrote: Hi there, i fixed the bug and attached the newest version of our api. Don't hesitate to ask for more help, Kind regards Am 31.12.10 16:52, schrieb Andreas Weiler: Hi, this feature isnt enabled for the run command yet. We put that on our todo-list and get it done as fast as possible. You could also have a look into our language bindings (for other ways then REST) [1], here you can also bind variables to queries. If your query is not to large, i guess the network traffic for sending the query for each request should not be too much. Kind regards, Andreas [1] http://www.inf.uni-konstanz.de/dbis/basex/bindings Am 31.12.10 16:18, schrieb software developer: Hi, The parameters are not bound to variables when a query is invoked via the run parameter. For example, I store my query in myquery.xq on the server side; if the query contains current-time() invocation of the URL http://localhost:8984/basex/jax-rx?wrap=no&run=myquery.xq&var=$x=21%01$y=2 <http://localhost:8984/basex/jax-rx?wrap=no&run=myquery.xq&var=$x=21%01$y=2> <http://localhost:8984/basex/jax-rx?wrap=no&run=myquery.xq&var=$x=21%01$y=2 <http://localhost:8984/basex/jax-rx?wrap=no&run=myquery.xq&var=$x=21%01$y=2>> results in display of current date-time but if the query contains declare variable $x as xs:integer external; declare variable $y as xs:integer external; $x*$y I get the error Stopped at line 1, column 34 in myquery.xq: [XQDY0002] No value defined for "$x as xs:integer". The parameters are correctly bound to variables when a query is invoked via the query parameter named query as you described, but that is not what I am after. Is this a bug? Is there a workaround? _______________________________________________ BaseX-Talk mailing list BaseX-Talk(a)mailman.uni-konstanz.de <mailto:BaseX-Talk@mailman.uni-konstanz.de> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk

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Too many open files? Ack!
by Charles F. Munat 04 Jan '11

04 Jan '11

Got this error: org.basex.core.BaseXException: /var/www/xxx/db/data/atv.basex (Too many open files) Oh, noes! What does this mean? I was just hitting the page quickly. I'm sunk if people can't hit the page repeatedly. Is there a setting to adjust this? Is it a heap space issue? How can I make sure this never happens? I have an embedded database. I load it through the application (no file). I don't know what you call that. It uses one big XQuery to generate the page. Any ideas? Thanks very much! Chas.

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Java binding - BaseXClient.receive and BaseXClient.execute methods
by Fabrice Etanchaud 04 Jan '11

04 Jan '11

Dear all at dbis, best greetings for the new year ! in the java binding class 'BaseXClient', is there any reason not to add UTF-8 encoding when transforming outputstream into string ? String receive() throws IOException { final ByteArrayOutputStream os = new ByteArrayOutputStream(); receive(os); return os.toString("UTF-8"); // return os.toString(); } public String execute(final String cmd) throws IOException { final OutputStream os = new ByteArrayOutputStream(); execute(cmd, os); return os.toString("UTF-8"); // return os.toString(); } In which encoding is BaseX data internally stored, and then restituted ? best regards, Fabrice ETANCHAUD

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Root?
by Charles F. Munat 04 Jan '11

04 Jan '11

I have an embedded Base-X database in a web application. I have a huge XQuery that involves a lot of local functions, many of them recursive. In several of these functions, I need to query the database to look up referenced elements. I can't for the life of me figure out a way to access the database without doing one of two things: 1. My document root is /data. I can let $root := /data and then pass that into every function. Passing things into functions rather than setting global variable is certainly and FP way of doing things, but in this instance it seems to me that it should be the scope I'm working in. 2. If something else I pass into the function is a node in the database, then I can, for example, use $node/root() to back up to the root node. But sometimes I'm only passing in a string and I still need to query the whole database. Is there some way to access the root easily from within a function? I am very confused by the whole "context" idea. I've looked all over, but I must be searching using the wrong terms, or it simply isn't done. Anyone know a way? Thanks, Chas.

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