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  • %META:TOPICPARENT{name="VirtSpongerLinkedDataHooksIntoSPARQL"}% ---++What? Virtuoso SPARQL pragma for negating query optimizer. ---++Why? There are situations where engine based query optimization isn't suitable for the SPARQL query at hand. In situations like this, you can apply a query pragma that signals to Virtuoso the need to negate its in-built query optimizer. ---++How? ---+++Example with pragma sql:select-option The following example demonstrates usage of the <code> sql:select-option </code> pragma. <verbatim> DEFINE sql:select-option "order" PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#> SELECT * WHERE { ?s ?p <http://www.Department0.University0.edu/GraduateCourse0> } LIMIT 10 </verbatim> * [[http://bit.ly/VU5H3F][View the SPARQL Query Definition via SPARQL Protocol URL]] * [[http://bit.ly/YaQ5D6][View the SPARQL Query Results via SPARQL Protocol URL]] ---++Sponger Usage Examples * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusageprocessorex][SPARQL Processor Usage Example]] * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusageproxyex2][RDF Proxy Service Example]] * [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtDeployingLinkedDataGuide_BrowsingNorthwindRdfView#AncMozToc2][Browsing & Exploring RDF View Example Using ODE]] * [[http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtDeployingLinkedDataGuide_BrowsingNorthwindRdfView#AncMozToc3][Browsing & Exploring RDF View Example Using iSPARQL]] * [[http://docs.openlinksw.com/virtuoso/rdfinsertmethods.html#rdfinsertmethodplapissimpleexample][Basic Sponger Cartridge Example]] * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongerusagebriefex][HTTP Example for Extracting Metadata using CURL]] * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongercartridgetypesmetarestexamples][RESTFul Interaction Examples]] * [[http://docs.openlinksw.com/virtuoso/sect5_virtuosospongercreatecustcartrrgstflickr.html][Flickr Cartridge Example]] * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html#virtuosospongercreatecustcartrexmp][MusicBrainz Metadatabase Example]] * [[VirtTipsAndTricksGuideAddTriplesNamedGraph][SPARQL Tutorial -- Magic of SPARUL and Sponger]] ---++Related * [[VirtSpongerLinkedDataHooksIntoSPARQL][Sponger's Linked Data Middleware Hooks into SPARQL]] * [[VirtSponger][Virtuoso Sponger]] * [[http://virtuoso.openlinksw.com/Whitepapers/html/VirtSpongerWhitePaper.html][Technical White Paper]] * [[VirtSpongerCartridgeSupportedDataSources][Supported Virtuoso Sponger Cartridges]] * [[SPARQLSponger][SPARQL Sponger]] * [[VirtInteractSpongerMiddlewareRESTPatterns][Interacting with Sponger Middleware via RESTful Patterns]] * [[VirtSpongerCartridgeSupportedDataSourcesMetaRESTExamples][Interacting with Sponger Meta Cartridge via RESTful Patterns]] * [[VirtSpongerCartridgeRDFExtractor][Sponger Cartridge RDF Extractor]] * [[RDFMappers][ Extending SPARQL IRI Dereferencing with RDF Mappers]] * [[VirtSpongerCartridgeProgrammersGuide][Programmer Guide for Virtuoso Linked Data Middleware ("Sponger")]] * [[VirtProgrammerGuideRDFCartridge][Create RDF Custom Cartridge Tutorial]] * [[VirtSpongerCartridgeSupportedDataSources][OpenLink-supplied Virtuoso Sponger Cartridges]] * [[VirtAuthServerUI][Virtuoso Authentication Server]] * [[VirtOAuthSPARQL][Virtuoso SPARQL OAuth Tutorial]] * [[VirtSpongerACL][Virtuoso Sponger Access Control List (ACL) Setup]] * [[VirtSPARQLSecurityWebID][WebID Protocol & SPARQL Endpoint ACLs Tutorial]] * [[http://docs.openlinksw.com/virtuoso/virtuososponger.html][Virtuoso Documentation]]
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  • VirtSpongerLinkedDataHooksIntoSPARQLEx37
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  • 2017-06-13T06:04:42Z
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