例子用的是音乐的例子,数据和代码在百度网盘,链接: https://pan.baidu.com/s/1Uj5VgwRMBtWxVIcPxtLpbQ 密码: mv76:
使用python代码随机生成一些数据示例,为了演示方便,生成的数据中没有artist_name这个属性,后面演示通过SPARQLUpdate语句添加
首先执行脚本python kg_music_triples.py,默认生成1000个三元组,生成的文件在当前目录,文件名为music_1000_triples.nt (例如,python kg_music_triples.py 500 ,传入参数500,则会生成500个三元组,文件名为music_500_triples.nt)
接下来启动服务/usr/local/apache-jena-fuseki-3.12.0/fuseki-server,并在浏览器中打开http://localhost:3030/(在linux系统中)
导入刚才生成的music_1000_triples.nt文件,导入成功后,并查看导入了多少三元组/usr/local/apache-jena-fuseki-3.12.0/run/databases/music
好数据已经准备好了,接下来进行查询和更新,在中间的编辑器中国添加我们自己的SPARQL语句,然后点击编辑器右上的执行按钮就可以执行SPARQL查询了
点击query,来到SPARQL查询界面,选择对应的设置,我们就可以开始查询图谱了
1.查询某一艺术家的所有歌曲
1 PREFIX music: <http://kg.course/music/> 2 SELECT DISTINCT ?trackID 3 WHERE { 4 ?trackID music:track_artist music:artist_001 5 }
2.查询某一艺术家的所有歌曲的歌曲名
PREFIX music: <http://kg.course/music/> SELECT ?name WHERE { ?trackID music:track_artist music:artist_01 . ?trackID music:track_name ?name }
3.查询某一首歌曲名的专辑信息
PREFIX music: <http://kg.course/music/> SELECT ?trackID ?ablumID ?name WHERE { ?trackID music:track_name "track_name_00001" . ?trackID music:track_album ?ablumID . ?ablumID music:ablum_name ?name }
4. 查询某一首歌曲名的专辑信息,使用中文来当变量名
PREFIX music: <http://kg.course/music/> SELECT ?歌曲id ?专辑id ?专辑名 WHERE { ?歌曲id music:track_name "track_name_00001" . ?歌曲id music:track_album ?专辑id . ?专辑id music:album_name ?专辑名 }
5.查询某一首歌曲名的专辑信息,变量名添加描述
PREFIX music: <http://kg.course/music/> SELECT ?歌曲id ?专辑id (CONCAT("专辑名",":",?专辑名) AS ?专辑信息) WHERE { ?歌曲id music:track_name "track_name_00001" . ?歌曲id music:track_album ?专辑id . ?专辑id music:album_name ?专辑名 }
6.查询某个专辑里面的所有歌曲
PREFIX music: <http://kg.course/music/> SELECT ?trackID WHERE { ?albumID music:album_name "album_name_0002" . ?trackID music:track_album ?albumID }
7.查询某个专辑里面的所有歌曲,限制前2
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?trackID WHERE { ?albumID music:album_name "album_name_0002" . ?trackID music:track_album ?albumID } limit 2
8.对某个专辑里面的所有歌曲计数
PREFIX music: <http://kg.course/music/> SELECT (COUNT(?trackID) as ?num) WHERE { ?albumID music:album_name "album_name_0002" . ?trackID music:track_album ?albumID }
9.查询某一首歌是哪一个艺术家的作品
PREFIX music: <http://kg.course/music/> SELECT ?trackID ?artistID WHERE { ?trackID music:track_name "track_name_00001" . ?trackID music:track_artist ?artistID }
10.查询某一首歌属于什么歌曲类型
PREFIX music: <http://kg.course/music/> SELECT ?trackID ?tag_name WHERE { ?trackID music:track_name "track_name_00001" . ?trackID music:track_tag ?tag_name }
11.查询某一艺术家唱过歌曲的所有标签
PREFIX music: <http://kg.course/music/> SELECT DISTINCT ?tag_name WHERE { ?trackID music:track_artist music:artist_001 . ?trackID music:track_tag ?tag_name }
12.查询某一艺术家唱过歌曲的所有类型并排序
PREFIX music: <http://kg.course/music/> SELECT DISTINCT ?tag_name WHERE { ?trackID music:track_artist music:artist_001 . ?trackID music:track_tag ?tag_name } ORDER BY ?tag_name
13.查询某几类歌曲标签中的歌曲的数目
PREFIX music: <http://kg.course/music/> SELECT (COUNT(?trackID ) AS ?num) WHERE { { ?trackID music:track_tag "tag_name_01" . } UNION { ?trackID music:track_tag "tag_name_02" . } }
PREFIX music: <http://kg.course/music/> SELECT (count(?trackID ) as ?num) WHERE { ?trackID music:track_tag ?tag_name FILTER (?tag_name = "tag_name_01"|| ?tag_name = "tag_name_02") }
14.查询所有歌曲中带有’xx’字符的歌曲名
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?subject ?object WHERE { ?subject <http://kg.course/music/track_name> ?object . FILTER regex(?object,"088") }
15.询问是否存在带有’xx’字符的歌曲名
PREFIX music: <http://kg.course/music/> ASK { ?trackID music:track_name ?track_name . FILTER regex(?track_name,"008") }
16.给艺术家id新增属性艺术家名字
PREFIX music: <http://kg.course/music/> INSERT DATA { music:arttist_01 music:artist_name "artist_name_01" . music:arttist_02 music:artist_name "artist_name_02" . music:arttist_03 music:artist_name "artist_name_03" . }
PREFIX music: <http://kg.course/music/> SELECT ?artistID ?artist_name WHERE { ?artistID music:artist_name ?artist_name }
17.删除增加的属性艺术家名字
PREFIX music: <http://kg.course/music/> DELETE { music:artist_02 music:artist_name ?x . } WHERE { music:artist_02 music:artist_name ?x . }
PREFIX music: <http://kg.course/music/> SELECT ?artistID ?artist_name WHERE { ?artistID music:artist_name ?artist_name }