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  • ---+ Customizing the Virtuoso SPARQL Endpoint This page will guide you through changing the SPARQL endpoint web page. You can create different variants of the page for different IRIs: 1. The default SPARQL endpoint page is found in the procedure named <b><code>WS.WS."/!sparql/"</code></b>, which is built from source code found in <b><code>libsrc/Wi/sparql_io.sql</code></b>. 1. Copy the code from the above procedure, and load it to a different name, e.g., <b><code>WS.WS."/!sparql_new/"</code></b>, through iSQL -- <verbatim> SQL> CREATE PROCEDURE WS.WS."/!sparql_new/" ( INOUT path VARCHAR, INOUT params ANY, INOUT lines ANY ) {... http(' <p>TEST This query page is designed to help you test OpenLink Virtuoso</p> ... }; Done. -- 60 msec. SQL> </verbatim> 1. Remove the VHost definition targeting the original page -- <verbatim> SQL> DB.DBA.VHOST_REMOVE (lpath=>'/sparql'); </verbatim> 1. Add a VHost definition targeting your new page. The command follows this form -- <verbatim> SQL> DB.DBA.VHOST_DEFINE ( lpath=>'/sparql/', ppath => '/your-function-name/', is_dav => 1, vsp_user => 'dba', opts => vector('noinherit', 1) ); </verbatim> -- so, for this example -- <verbatim> SQL> DB.DBA.VHOST_DEFINE ( lpath=>'/sparql/', ppath => '/!sparql_new/', is_dav => 1, vsp_user => 'dba', opts => vector('noinherit', 1) ); </verbatim> 1. Give the SPARQL user permission to execute your new page, following this form -- <verbatim> SQL> GRANT EXECUTE ON WS.WS."your-function" TO "SPARQL" ; </verbatim> -- so, for this example -- <verbatim> SQL> GRANT EXECUTE ON WS.WS."/!sparql_new/" TO "SPARQL" ; </verbatim> <i><b>Note:</b> you should use double quotes around name of "SPARQL" user and the upper case, to avoid confusion with the <code>SPARQL</code> keyword, you should always use double-quote wrappers *and* upper-case to refer to the <code>"SPARQL"</code> user.</i>%BR%%BR% 1. Set attributes on your new page, such that Virtuoso's HTTP server component will not treat it as a physical path (DAV or filesystem) to be read and compiled as a procedure, following the command form -- <verbatim> SQL> registry_set ( '/your-function-name/', 'no_vsp_recompile' ); </verbatim> -- so, for this example -- <verbatim> SQL> registry_set ( '/!sparql_new/', 'no_vsp_recompile' ); </verbatim> 1. Access the new SPARQL endpoint, which should show your changes -- %BR%%BR%<img src="%ATTACHURLPATH%/s1.png" style="wikiautogen"/>%BR%%BR% CategorySPARQL CategoryVirtuoso
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  • 2013-10-25T16:57:08Z
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