Provided by: tracker_2.1.8-2_amd64 bug

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 properties 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 providing 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 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 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 ontology. 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 properties 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 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.

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 seconds.

              $ 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/