1TRACKER3-SPARQL(1) Tracker manual TRACKER3-SPARQL(1)
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6 tracker3-sparql - Use SparQL to query the Tracker databases.
7
9 tracker3 sparql -q <sparql> [-u] | -f <file>
10 tracker3 sparql -t [class] [-s <needle>] [-p]
11 tracker3 sparql [-c] [-p] [-x] [-n [class]] [-i [property]] [-s <needle>]
12 tracker3 sparql [--get-longhand <class>] [--get-shorthand <class>]
13
15 This command allows probing of the current database schema (also known
16 as ontology) and running low level queries or updates on the data set.
17 In terms of the database ontology, it’s easy to find out what
18 properties are indexed for speed, or notified on changes, what classes
19 are available and the properties belonging to those classes. There are
20 also visual tools to display an ascii tree layout of the classes and
21 their relationships to each other.
22 When the caller runs a query, the query is in RDF and SPARQL. This can
24 be done two ways. Either by providing a file with the query or by
25 providing a string with the sparql query.
26 The file argument can be either a local path or a URI. It also does not
28 have to be an absolute path.
29
31 -f, --file=<file>
32 Use a file with SPARQL content to query or update.
33 -q, --query=<sparql>
35 Use a sparql string to query the database with.
36 -u, --update
38 This has to be used with --query. This tells "tracker3 sparql" to
39 use the SPARQL update extensions so it knows it isn’t a regular
40 data lookup request. So if your query is intended to change data in
41 the database, this option is needed.
42 -c, --list-classes
44 Returns a list of classes which describe the ontology used for
45 storing data. These classes are also used in queries. For example,
46 http://www.w3.org/2000/01/rdf-schema#Resource is one of many
47 classes which should be returned here.
48 -x, --list-class-prefixes
50 Returns a list of classes and their related prefixes. Prefixes are
51 used to make querying a lot simpler and are much like an alias. For
52 example, http://www.w3.org/2000/01/rdf-schema#Resource has the
53 prefix rdfs so queries can be cut down to:
54 "SELECT ?u WHERE { ?u a rdfs:Resource }"
56 -p, --list-properties=[class]
58 Returns a list of properties which pertain to a class. You can use
59 both formats here for the class, either the full name
60 http://tracker.api.gnome.org/ontology/v3/nfo#Video or the shortened
61 prefix name nfo:Video.
62 This gives the following result:
64 $ tracker3 sparql -p nfo:Video
66 Properties: 2
68 http://tracker.api.gnome.org/ontology/v3/nfo#frameRate
69 http://tracker.api.gnome.org/ontology/v3/nfo#frameCount
70 These properties nfo:frameRate and nfo:frameCount can then be used in
72 queries.
73 See also --tree and --query.
75 -n, --list-notifies=[class]
77 Returns a list of classes which are notified over D-Bus about any
78 changes that occur in the database. The class does not have to be
79 supplied here. This is optional and filters the results according
80 to any argument supplied. With no class, all classes are listed.
81 -i, --list-indexes=[property]
83 Returns a list of properties which are indexed in the database.
84 Indexes improves query speed but also add an indexing penalty. The
85 property does not have to be supplied here. This is optional and
86 filters the results according to any argument supplied. With no
87 property, all properties are listed.
88 · -g, --list-graphs:: List all the named graphs in the database.
90 These are used by the filesystem miner to separate metadata so
91 that apps can only see the information relevant to them.
92 -t, --tree=[class]
94 Prints a tree showing all parent classes of class in the ontology.
95 The class can be provided in shorthand or longhand (see
96 --get-shorthand and --get-longhand for details). For example:
97 $ tracker3 sparql -t nmo:MMSMessage
99 ROOT
100 +-- rdfs:Resource (C)
101 | +-- nie:InformationElement (C)
102 | | +-- nfo:Document (C)
103 | | | +-- nfo:TextDocument (C)
104 | | | | `-- nmo:Message (C)
105 | | | | | +-- nmo:PhoneMessage (C)
106 | | | | | | `-- nmo:MMSMessage (C)
107 If no class is given, the entire tree is shown.
109 The --search command line option can be used to highlight parts of the
111 tree you’re looking for. The search is case insensitive.
112 The --properties command line option can be used to show properties for
114 each class displayed, for example:
115 $ tracker3 sparql -t nfo:FileDataObject -p
117 ROOT
118 +-- rdfs:Resource (C)
119 | --> http://purl.org/dc/elements/1.1/contributor (P)
120 | --> http://purl.org/dc/elements/1.1/coverage (P)
121 | --> http://purl.org/dc/elements/1.1/creator (P)
122 | --> http://purl.org/dc/elements/1.1/date (P)
123 | --> http://purl.org/dc/elements/1.1/description (P)
124 | --> http://purl.org/dc/elements/1.1/format (P)
125 | --> http://purl.org/dc/elements/1.1/identifier (P)
126 | --> http://purl.org/dc/elements/1.1/language (P)
127 | --> http://purl.org/dc/elements/1.1/publisher (P)
128 | --> http://purl.org/dc/elements/1.1/relation (P)
129 | --> http://purl.org/dc/elements/1.1/rights (P)
130 | --> http://purl.org/dc/elements/1.1/source (P)
131 | --> http://purl.org/dc/elements/1.1/subject (P)
132 | --> http://purl.org/dc/elements/1.1/title (P)
133 | --> http://purl.org/dc/elements/1.1/type (P)
134 | --> nao:deprecated (P)
135 | --> nao:hasTag (P)
136 | --> nao:identifier (P)
137 | --> nao:isRelated (P)
138 | --> nao:lastModified (P)
139 | --> nao:numericRating (P)
140 | --> rdf:type (P)
141 | --> rdfs:comment (P)
142 | --> rdfs:label (P)
143 | --> nrl:added (P)
144 | --> nrl:damaged (P)
145 | --> nrl:modified (P)
146 | +-- nie:DataObject (C)
147 | | --> nfo:belongsToContainer (P)
148 | | --> nie:byteSize (P)
149 | | --> nie:created (P)
150 | | --> nie:dataSource (P)
151 | | --> nie:interpretedAs (P)
152 | | --> nie:isPartOf (P)
153 | | --> nie:lastRefreshed (P)
154 | | --> nie:url (P)
155 | | --> tracker:available (P)
156 | | +-- nfo:FileDataObject (C)
157 | | | --> nfo:fileCreated (P)
158 | | | --> nfo:fileLastAccessed (P)
159 | | | --> nfo:fileLastModified (P)
160 | | | --> nfo:fileName (P)
161 | | | --> nfo:fileOwner (P)
162 | | | --> nfo:fileSize (P)
163 | | | --> nfo:hasHash (P)
164 | | | --> nfo:permissions (P)
165 -s, --search=<needle>
167 Returns a list of classes and properties which partially match
168 needle in the ontology. This is a case insensitive match, for
169 example:
170 $ tracker3 sparql -s text
172 Classes: 4
174 http://tracker.api.gnome.org/ontology/v3/nfo#TextDocument
175 http://tracker.api.gnome.org/ontology/v3/nfo#PlainTextDocument
176 http://tracker.api.gnome.org/ontology/v3/nfo#PaginatedTextDocument
177 http://tracker.api.gnome.org/ontology/v3/nmm#SynchronizedText
178 Properties: 4
180 http://tracker.api.gnome.org/ontology/v3/tracker#fulltextIndexed
181 http://tracker.api.gnome.org/ontology/v3/nie#plainTextContent
182 http://tracker.api.gnome.org/ontology/v3/nmo#plainTextMessageContent
183 http://tracker.api.gnome.org/ontology/v3/scal#textLocation
184 See also --tree.
186 --get-shorthand=<class>
188 Returns the shorthand for a class given by a URL. For example:
189 $ tracker3 sparql --get-shorthand http://tracker.api.gnome.org/ontology/v3/nmo#plainTextMessageContent
191 nmo:plainTextMessageContent
192 --get-longhand=<class>
194 Returns the longhand for a class given in the form of
195 CLASS:PROPERTY. For example:
196 $ tracker3 sparql --get-longhand nmm:MusicPiece
198 http://tracker.api.gnome.org/ontology/v3/nmm#MusicPiece
199
201 List all classes
202 $ tracker3 sparql -q "SELECT ?cl WHERE { ?cl a rdfs:Class }"
204 List all properties for the Resources class (see --list-properties)
206 $ tracker3 sparql -q "SELECT ?prop WHERE {
208 ?prop a rdf:Property ;
209 rdfs:domain <http://www.w3.org/2000/01/rdf-schema#Resource>
210 }"
211 List all class namespace prefixes
213 $ tracker3 sparql -q "SELECT ?prefix ?ns WHERE {
215 ?ns a nrl:Namespace ;
216 nrl:prefix ?prefix
217 }"
218 List all music files
220 $ tracker3 sparql -q "SELECT ?song WHERE { ?song a nmm:MusicPiece }"
222 List all music albums, showing title, track count, and length in
224 seconds.
225 $ tracker3 sparql -q "SELECT ?title COUNT(?song)
227 AS songs
228 SUM(?length) AS totallength
229 WHERE {
230 ?album a nmm:MusicAlbum ;
231 nie:title ?title .
232 ?song nmm:musicAlbum ?album ;
233 nfo:duration ?length
234 } GROUP BY ?album"
235 List all music from a particular artist
237 $ tracker3 sparql -q "SELECT ?song ?title WHERE {
239 ?song nmm:performer [ nmm:artistName 'Artist Name' ] ;
240 nie:title ?title
241 }"
242 Set the played count for a song
244 $ tracker3 sparql -u -q "DELETE {
246 <file:///home/user/Music/song.mp3> nie:usageCounter ?count
247 } WHERE {
248 <file:///home/user/Music/song.mp3> nie:usageCounter ?count
249 } INSERT {
250 <file:///home/user/Music/song.mp3> nie:usageCounter 42
251 }"
252 List all image files
254 $ tracker3 sparql -q "SELECT ?image WHERE { ?image a nfo:Image }"
256 List all image files with a specific tag
258 $ tracker3 sparql -q "SELECT ?image WHERE {
260 ?image a nfo:Image ;
261 nao:hasTag [ nao:prefLabel 'tag' ]
262 }"
263 List all image files created on a specific month and order by date
265 $ tracker3 sparql -q "SELECT ?image ?date WHERE {
267 ?image a nfo:Image ;
268 nie:contentCreated ?date .
269 FILTER (?date >= '2008-07-01T00:00:00' &&
270 ?date < '2008-08-01T00:00:00')
271 } ORDER BY ?date"
272
274 tracker3-sql(1), tracker3-info(1).
275 http://nepomuk.semanticdesktop.org/
277 http://www.w3.org/TR/rdf-sparql-query/
278 3.0.4 04/03/2021 TRACKER3-SPARQL(1)