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tracker-sparql(1)		 User Commands		     tracker-sparql(1)

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

SYNOPSIS
       tracker sparql -q <sparql> [-u] | -f <file>
       tracker sparql -t [class] [-s <needle>] [-p]
       tracker sparql [-c] [-p]	[-x] [-n [class]] [-i [property]] [-s <needle>]
       tracker sparql [--get-longhand <class>] [--get-shorthand	<class>]

DESCRIPTION
       This  command allows probing of the current database schema (also known
       as ontology) and	running	low level queries or updates on	the data  set.
       In  terms  of the database ontology, it's easy to find out what proper-
       ties are	indexed	for speed, or notified on changes,  what  classes  are
       available and the properties belonging to those classes.	There are also
       visual tools to display an ascii	tree layout of the classes  and	 their
       relationships to	each other.

       When  the caller	runs a query, the query	is in RDF and SPARQL. This can
       be done two ways. Either	by providing a file with the query or by  pro-
       viding a	string with the	sparql query.

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

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	 exam-
	      ple,  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#Re-
	      source 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  then  be
	      used in queries.

	      See also --tree and --query.

       -n, --list-notifies=[class]
	      Returns  a  list	of classes which are notified over D-Bus about
	      any changes that occur in	the database. The 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.

       -i, --list-indexes=[property]
	      Returns  a list of properties which are indexed in the database.
	      Indexes improves query speed but also add	an  indexing  penalty.
	      The property does	not have to be supplied	here. This is optional
	      and filters the results according	to any argument	supplied. With
	      no property, all properties are listed.

       -t, --tree=[class]
	      Prints  a	tree showing all parent	classes	of class in the	ontol-
	      ogy. The class can be provided in	 shorthand  or	longhand  (see
	      --get-shorthand and --get-longhand for details). For example:

	      $	tracker	sparql -t nmo:MMSMessage
	      ROOT
		+-- rdfs:Resource (C)
		|  +-- nie:InformationElement (C)
		|  |  +-- nfo:Document (C)
		|  |  |	 +-- nfo:TextDocument (C)
		|  |  |	 |  `--	nmo:Message (C)
		|  |  |	 |  |  +-- nmo:PhoneMessage (C)
		|  |  |	 |  |  |  `-- nmo:MMSMessage (C)

	      If no class is given, the	entire tree is shown.

	      The  --search command line option	can be used to highlight parts
	      of the tree you're looking for. The search is case insensitive.

	      The --properties command line option can be used to show proper-
	      ties for each class displayed, for example:

	      $	tracker	sparql -t nfo:FileDataObject -p
	      ROOT
		+-- rdfs:Resource (C)
		|  --> http://purl.org/dc/elements/1.1/contributor (P)
		|  --> http://purl.org/dc/elements/1.1/coverage	(P)
		|  --> http://purl.org/dc/elements/1.1/creator (P)
		|  --> http://purl.org/dc/elements/1.1/date (P)
		|  --> http://purl.org/dc/elements/1.1/description (P)
		|  --> http://purl.org/dc/elements/1.1/format (P)
		|  --> http://purl.org/dc/elements/1.1/identifier (P)
		|  --> http://purl.org/dc/elements/1.1/language	(P)
		|  --> http://purl.org/dc/elements/1.1/publisher (P)
		|  --> http://purl.org/dc/elements/1.1/relation	(P)
		|  --> http://purl.org/dc/elements/1.1/rights (P)
		|  --> http://purl.org/dc/elements/1.1/source (P)
		|  --> http://purl.org/dc/elements/1.1/subject (P)
		|  --> http://purl.org/dc/elements/1.1/title (P)
		|  --> http://purl.org/dc/elements/1.1/type (P)
		|  --> nao:deprecated (P)
		|  --> nao:hasTag (P)
		|  --> nao:identifier (P)
		|  --> nao:isRelated (P)
		|  --> nao:lastModified	(P)
		|  --> nao:numericRating (P)
		|  --> rdf:type	(P)
		|  --> rdfs:comment (P)
		|  --> rdfs:label (P)
		|  --> tracker:added (P)
		|  --> tracker:damaged (P)
		|  --> tracker:modified	(P)
		|  +-- nie:DataObject (C)
		|  |  --> nfo:belongsToContainer (P)
		|  |  --> nie:byteSize (P)
		|  |  --> nie:created (P)
		|  |  --> nie:dataSource (P)
		|  |  --> nie:interpretedAs (P)
		|  |  --> nie:isPartOf (P)
		|  |  --> nie:lastRefreshed (P)
		|  |  --> nie:url (P)
		|  |  --> tracker:available (P)
		|  |  +-- nfo:FileDataObject (C)
		|  |  |	 --> nfo:fileCreated (P)
		|  |  |	 --> nfo:fileLastAccessed (P)
		|  |  |	 --> nfo:fileLastModified (P)
		|  |  |	 --> nfo:fileName (P)
		|  |  |	 --> nfo:fileOwner (P)
		|  |  |	 --> nfo:fileSize (P)
		|  |  |	 --> nfo:hasHash (P)
		|  |  |	 --> nfo:permissions (P)

       -s, --search=<needle>
	      Returns  a  list of classes and properties which partially match
	      needle 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: 4
		http://www.tracker-project.org/ontologies/tracker#fulltextIndexed
		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

	      See also --tree.

       --get-shorthand=<class>
	      Returns the shorthand for	a class	given by a URL.	 For example:

	      $	tracker	sparql --get-shorthand http://www.semanticdesktop.org/ontologies/2007/03/22/nmo#plainTextMessageContent
	      nmo:plainTextMessageContent

       --get-longhand=<class>
	      Returns	the  longhand  for  a  class  given  in	 the  form  of
	      CLASS:PROPERTY.  For example:

	      $	tracker	sparql --get-longhand nmm:MusicPiece
	      http://www.tracker-project.org/temp/nmm#MusicPiece

ENVIRONMENT
       TRACKER_SPARQL_BACKEND
	      This option allows you to	choose which backend you use for  con-
	      necting  to the database.	This choice can	limit your functional-
	      ity. There are three settings.

	      With "direct" the	connection to the database is made directly to
	      the  file	itself on the disk, there is no	intermediary daemon or
	      process. The "direct" approach is	purely read-only.

	      With "bus" the tracker-store process is used to liase  with  the
	      database	queuing	 all requests and managing the connections via
	      an IPC / D-Bus. This adds	a small	overhead BUT this is the  only
	      approach you can use if you want to write	to the database.

	      With  "auto"  the	backend	is decided for you, much like it would
	      be if this environment variable was undefined.

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, showing title, track count, and length  in  sec-
       onds.

	      $	tracker	sparql -q "SELECT ?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-sql(1), tracker-store(1), tracker-info(1).

       http://nepomuk.semanticdesktop.org/

       http://www.w3.org/TR/rdf-sparql-query/

GNU				   July	2009		     tracker-sparql(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | EXAMPLES | SEE ALSO

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