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Subject Item: n2:VirtTipsAndTricksGuideCustomSPARQLExtensionFunction
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dcterms:created: 2017-06-13T05:46:20.510933
dcterms:modified: 2017-06-13T05:46:20.510933
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sioc:content: %META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---+ Are custom SPARQL extension functions supported? How can I use them? Virtuoso supports two ways to write one's own custom [[http://www.w3.org/TR/rdf-sparql-query/#extensionFunctions][SPARQL extension functions]]: %TOC% ---++ Use a Stored Procedure You can create a SQL stored procedure in Virtuoso PL and, call it using the <code><b>sql:</b></code> prefix: <verbatim> SQL> CREATE PROCEDURE testfunc() { -- your code here } ; Done; SQL> SPARQL SELECT * WHERE { ?s ?p `sql:testfunc(?o)` }; </verbatim> For more details see [[http://docs.openlinksw.com/virtuoso/rdfsparql.html#rdfsqlfromsparql][Calling SQL from SPARQL]] Virtuoso Documentation. ---++ Create a built-in function You can also make a built-in function, which is basically a <code>C</code> function that can be called from both SQL and SPARQL, as in the example from below, using the <code><b>bif:</b></code> prefix. In this SPARQL example, we use the <code>CONTAINS</code> function to do a freetext search on all <code>?o</code> that contain words starting with <code>"Timo"</code>. <verbatim> SELECT * FROM <http://www.w3.org/people#> WHERE { ?s ?p ?o . ?o bif:contains '"Timo*"' } </verbatim> For more details see [[http://docs.openlinksw.com/virtuoso/sparqlextensions.html#rdfsparqlrulefulltext][Using Full Text Search in SPARQL]] Virtuoso Documentation. This feature also allows you to use relevant functions from the [[http://docs.openlinksw.com/virtuoso/functions.html][Virtuoso SQL Functions Guide]] inside a SPARQL query. ---++ Related * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[http://docs.openlinksw.com/virtuoso/sparqlextensions.html][Virtuoso Documentation]]
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atom:title: VirtTipsAndTricksGuideCustomSPARQLExtensionFunction
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atom:author: n10:this
atom:published: 2017-06-13T05:46:20Z
atom:updated: 2017-06-13T05:46:20Z
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