Provided by: tracker-utils_0.16.5-0ubuntu0.2_amd64 
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.
-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: 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
-V, --version
Print version.
ENVIRONMENT
TRACKER_SPARQL_BACKEND
This option allows you to choose which backend you use for connecting to the
database. This choice can limit your functionality. 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.
TRACKER_PRAGMAS_FILE
Tracker has a fixed set of PRAGMA settings for creating its SQLite connection.
With this environment variable pointing to a text file you can override these
settings. The file is a \n separated list of SQLite queries to execute on any newly
created SQLite connection in tracker-store.
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/