Ubuntu Manpage: tracker3-sparql - Use SparQL to query the Tracker databases.

NAME

       tracker3-sparql - Use SparQL to query the Tracker databases.

SYNOPSIS

       tracker3 sparql -q <sparql> [-u] | -f <file>
       tracker3 sparql -t [class] [-s <needle>] [-p]
       tracker3 sparql [-c] [-p] [-x] [-n [class]] [-i [property]] [-s <needle>]
       tracker3 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 "tracker3 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://tracker.api.gnome.org/ontology/v3/nfo#Video
           or the shortened prefix name nfo:Video.

       This gives the following result:

           $ tracker3 sparql -p nfo:Video

           Properties: 2
             http://tracker.api.gnome.org/ontology/v3/nfo#frameRate
             http://tracker.api.gnome.org/ontology/v3/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.

           •   -g, --list-graphs:: List all the named graphs in the database. These are used by
               the filesystem miner to separate metadata so that apps can only see the
               information relevant to them.

       -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:

           $ tracker3 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:

           $ tracker3 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)
             |  --> nrl:added (P)
             |  --> nrl:damaged (P)
             |  --> nrl: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:

           $ tracker3 sparql -s text

           Classes: 4
             http://tracker.api.gnome.org/ontology/v3/nfo#TextDocument
             http://tracker.api.gnome.org/ontology/v3/nfo#PlainTextDocument
             http://tracker.api.gnome.org/ontology/v3/nfo#PaginatedTextDocument
             http://tracker.api.gnome.org/ontology/v3/nmm#SynchronizedText

           Properties: 4
             http://tracker.api.gnome.org/ontology/v3/tracker#fulltextIndexed
             http://tracker.api.gnome.org/ontology/v3/nie#plainTextContent
             http://tracker.api.gnome.org/ontology/v3/nmo#plainTextMessageContent
             http://tracker.api.gnome.org/ontology/v3/scal#textLocation

       See also --tree.

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

           $ tracker3 sparql --get-shorthand http://tracker.api.gnome.org/ontology/v3/nmo#plainTextMessageContent
           nmo:plainTextMessageContent

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

           $ tracker3 sparql --get-longhand nmm:MusicPiece
           http://tracker.api.gnome.org/ontology/v3/nmm#MusicPiece

EXAMPLES

       List all classes

               $ tracker3 sparql -q "SELECT ?cl WHERE { ?cl a rdfs:Class }"

       List all properties for the Resources class (see --list-properties)

               $ tracker3 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

               $ tracker3 sparql -q "SELECT ?prefix ?ns WHERE {
                   ?ns a nrl:Namespace ;
                   nrl:prefix ?prefix
               }"

       List all music files

               $ tracker3 sparql -q "SELECT ?song WHERE { ?song a nmm:MusicPiece }"

       List all music albums, showing title, track count, and length in seconds.

               $ tracker3 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

               $ tracker3 sparql -q "SELECT ?song ?title WHERE {
                   ?song nmm:performer [ nmm:artistName 'Artist Name' ] ;
                   nie:title ?title
               }"

       Set the played count for a song

               $ tracker3 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

               $ tracker3 sparql -q "SELECT ?image WHERE { ?image a nfo:Image }"

       List all image files with a specific tag

               $ tracker3 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

               $ tracker3 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"

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

EXAMPLES

SEE ALSO