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tracker-sparql(1) |
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tracker-sparql − Use SparQL to query the Tracker databases.
tracker-sparql [OPTION...] [-q QUERY] | [-f FILE]
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.
−?, −−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.
−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. 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.
−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.
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"
tracker-store(1),
tracker-info(1).
http://nepomuk.semanticdesktop.org/
http://www.w3.org/TR/rdf-sparql-query/
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tracker-sparql(1) | |