Ubuntu Manpage: tracker-sparql - Use SparQL to query the Tracker databases.

name
synopsis
description
options
environment
examples
see also

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"