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

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.

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

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

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

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>]

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

Contents

Description

Examples

Name

Options

See Also

Synopsis

See Also