| content
| - ---+ 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
|
![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)