Poster of Linux kernelThe best gift for a Linux geek
tracker-sparql

tracker-sparql

Section: User Commands (1) Updated: July 2009
Local index Up

 

NAME

tracker-sparql - Use SparQL to query the Tracker databases.

 

SYNOPSIS

tracker-sparql [OPTION...] [-q QUERY] | [-f FILE]

 

DESCRIPTION

tracker-sparql allows the caller to run an RDF query on the database. This can be done two ways. Either by providing a FILE with the query or by providing a string with the QUERY string.

The FILE argument can be either a local path or a URI. It also does not have to be an absolute path.

 

OPTIONS

-?, --help
Show summary of options.
-f, --file=FILE
Use a FILE with SPARQL content to query or update.
-q, --query=SPARQL
Use a SPARQL string to query the database with.
-u, --update
This has to be used with --query. This tells tracker-sparql to use the SPARQL update extensions so it knows it isn't a regular data lookup request. So if your query is intended to change data in the database, this option is needed.
-c, --list-classes
Returns a list of classes which describe the ontology used for storing data. These classes are also used in queries. For example, http://www.w3.org/2000/01/rdf-schema#Resource is one of many classes which should be returned here.
-x, --list-class-prefixes
Returns a list of classes and their related prefixes. Prefixes are used to make querying a lot simpler and are much like an alias. For example, http://www.w3.org/2000/01/rdf-schema#Resource has the prefix rdfs so queries can be cut down to:

"SELECT ?u WHERE { ?u a rdfs:Resource }"

-p, --list-properties=CLASS
Returns a list of properties which pertain to a class. You can use both formats here for the class, either the full name http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#Video or the shortened prefix name nfo:Video.

This gives the following result:

$ tracker-sparql -p nfo:Video

Properties: 2
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#frameRate
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#frameCount

These properties nfo:frameRate and nfo:frameCount can be used in more complex queries (see --query).

-n, --list-notifies=CLASS
Returns a list of classes which are notified over D-Bus about any changes that occur in the database. CLASS does not have to be supplied here. This is optional and filters the results according to any argument supplied. With no CLASS, all classes are listed.

-s, --search=TERM
Returns a list of classes and properties which partially match TERM in the ontology. This is a case insensitive match, for example:

$ tracker-sparql -s text

Classes: 4
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#TextDocument
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#PlainTextDocument
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#PaginatedTextDocument
  http://www.tracker-project.org/temp/nmm#SynchronizedText

Properties: 5
  http://www.tracker-project.org/ontologies/tracker#fulltextIndexed
  http://www.tracker-project.org/ontologies/tracker#fulltextNoLimit
  http://www.semanticdesktop.org/ontologies/2007/01/19/nie#plainTextContent
  http://www.semanticdesktop.org/ontologies/2007/03/22/nmo#plainTextMessageContent
  http://www.tracker-project.org/temp/scal#textLocation

-V, --version
Print version.

 

EXAMPLES

List all classes

$ tracker-sparql -q "SELECT ?cl WHERE { ?cl a rdfs:Class }"

List all properties for the Resources class (see --list-properties)

$ tracker-sparql -q "SELECT ?prop WHERE {
      ?prop a rdf:Property ;
      rdfs:domain <http://www.w3.org/2000/01/rdf-schema#Resource>
 }"

List all class namespace prefixes

$ tracker-sparql -q "SELECT ?prefix ?ns WHERE {
      ?ns a tracker:Namespace ;
      tracker:prefix ?prefix
 }"

List all music files

$ tracker-sparql -q "SELECT ?song WHERE { ?song a nmm:MusicPiece }"

List all music albums

$ tracker-sparql -q "SELECT ?album ?title COUNT(?song)
                     AS songs
                     SUM(?length) AS totallength
                     WHERE {
      ?album a nmm:MusicAlbum ;
      nie:title ?title .
      ?song nmm:musicAlbum ?album ;
      nfo:duration ?length
 } GROUP BY ?album"

List all music from a particular artist

$ tracker-sparql -q "SELECT ?song ?title WHERE {
      ?song nmm:performer [ nmm:artistName 'Artist Name' ] ;
      nie:title ?title
 }"

Set the played count for a song

$ tracker-sparql -u -q "DELETE {
      <file:///home/user/Music/song.mp3> nie:usageCounter ?count
 } WHERE {
      <file:///home/user/Music/song.mp3> nie:usageCounter ?count
 } INSERT {
      <file:///home/user/Music/song.mp3> nie:usageCounter 42
 }"

List all image files

$ tracker-sparql -q "SELECT ?image WHERE { ?image a nfo:Image }"

List all image files with a specific tag

$ tracker-sparql -q "SELECT ?image WHERE {
      ?image a nfo:Image ;
      nao:hasTag [ nao:prefLabel 'tag' ]
 }"

List all image files created on a specific month and order by date

$ tracker-sparql -q "SELECT ?image ?date WHERE {
      ?image a nfo:Image ;
      nie:contentCreated ?date .
      FILTER (?date >= '2008-07-01T00:00:00' &&
              ?date <  '2008-08-01T00:00:00')
 } ORDER BY ?date"

 

SEE ALSO

tracker-store(1), tracker-info(1).
http://nepomuk.semanticdesktop.org/
http://www.w3.org/TR/rdf-sparql-query/


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 21:26:28 GMT, April 16, 2011