Question

我在jena fuseki rdf商店有很多图形名称，这些是我的图表的名称：

| <http://stormsmacs/tests/2015-03-03T04:27:57Z> |
| <http://stormsmacs/tests/2015-03-03T05:20:59Z> |
| <http://stormsmacs/tests/2015-03-03T05:22:29Z> |
| <http://stormsmacs/tests/2015-03-03T05:25:03Z> |
| <http://stormsmacs/tests/2015-03-03T05:27:01Z> |
| <http://stormsmacs/tests/2015-03-03T05:30:37Z> |
| <http://stormsmacs/tests/2015-03-03T05:44:02Z> |
| <http://stormsmacs/tests/2015-03-03T05:52:19Z> |
| <http://stormsmacs/tests/2015-03-03T05:58:47Z> |

等等。如何过滤图形以获得两个日期之间的所有图形？

非常感谢你！

Answer 1

当我们使用实际数据时，它会更容易。请务必提供我们将来可以使用的数据。对于这种情况，我只是使用值块将带有嵌入日期时间的URI绑定到？dateUri 变量。查询中的注释解释了发生了什么。一般的想法是将URI转换为字符串，去掉公共前缀，将后缀转换为 xsd：dateTime ，以及基于它的过滤器。

prefix xsd: <http://www.w3.org/2001/XMLSchema#>

select ?dateTime where {
  #-- the "dates" encoded in URIs
  values ?dateUri { <http://stormsmacs/tests/2015-03-03T04:27:57Z>
                    <http://stormsmacs/tests/2015-03-03T05:20:59Z>
                    <http://stormsmacs/tests/2015-03-03T05:22:29Z>
                    <http://stormsmacs/tests/2015-03-03T05:25:03Z>
                    <http://stormsmacs/tests/2015-03-03T05:27:01Z>
                    <http://stormsmacs/tests/2015-03-03T05:30:37Z>
                    <http://stormsmacs/tests/2015-03-03T05:44:02Z>
                    <http://stormsmacs/tests/2015-03-03T05:52:19Z>
                    <http://stormsmacs/tests/2015-03-03T05:58:47Z> }

  #-- an arbitrary begin and end date                    
  values ?begin { "2015-03-03T05:22:29Z"^^xsd:dateTime }
  values ?end   { "2015-03-03T05:44:02Z"^^xsd:dateTime }

  #-- extract the dateTime portion from the URI string, and convert
  #-- it to an xsd:dateTime.
  bind( xsd:dateTime(strafter(str(?dateUri),"http://stormsmacs/tests/")) as ?dateTime )

  #-- filter results based on the begin and end time
  filter( ?begin <= ?dateTime && ?dateTime <= ?end )
}

----------------------------------------
| dateTime                             |
========================================
| "2015-03-03T05:22:29Z"^^xsd:dateTime |
| "2015-03-03T05:25:03Z"^^xsd:dateTime |
| "2015-03-03T05:27:01Z"^^xsd:dateTime |
| "2015-03-03T05:30:37Z"^^xsd:dateTime |
| "2015-03-03T05:44:02Z"^^xsd:dateTime |
----------------------------------------

sparql rdf fuseki如何在图形名称中过滤日期

1 个答案: