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<h1>22. Virtuoso Functions Guide - DB.DBA.RDF_LOAD_RDFXML_MT</h1>
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<div id="text">
<h2>DB.DBA.RDF_LOAD_RDFXML_MT</h2>
<div class="refpurpose">Parses the content of large RDF/XML text as a sequence of separate RDF triples.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">DB.DBA.RDF_LOAD_RDFXML_MT</span>
</span>
(<span class="paramdef">in <span class="parameter">strg</span> varchar</span>,
<span class="paramdef">in <span class="parameter">base</span> varchar</span>,
<span class="paramdef">in <span class="parameter">graph</span> varchar</span>,
<span class="paramdefoptional">[in <span class="optional">log_mode</span> integer]</span>,
<span class="paramdefoptional">[in <span class="optional">threads</span> integer]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>For loading large resources when transactional integrity is not important (loading of a single resource may take more than one transaction). The function may or may not leave a transaction log, depending on <span class="computeroutput">log_mode</span>. Hence, after successful load, one may need to execute the checkpoint statement to make sure that a server restart does not wipe out the results.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">strg – </span>
text of the resource.
</div>
<div class="refsect2">
<span class="refsect2title">base – </span>
base IRI to resolve relative IRIs to absolute.
</div>
<div class="refsect2">
<span class="refsect2title">graph – </span>
target graph IRI, parsed triples will appear in that graph.
</div>
<div class="refsect2">
<span class="refsect2title">log_mode – </span>
detail level of writing the effect of loading to the transaction log. 0 means log nothing, 1 means log only allocations of internal IDs for new IRIs and literals, 2 means log everything. If database crashes when the loading is in progress or after the loading but before checkpoint is made, 0 will means that the database become inconsistent, 1 means that the database is consistent but loaded quads may disappear so the loading should be repeated and log replay may produce wrong results if actions in it depend on the content of quad store, 2 means no danger (so the default is 2). Hence loading with mode 1 and especially mode 0 are faster than usual mode 2 but they require checkpoints after data loadings and mode 0 additionally requires a checkpoint and database backup right before the loading.
</div>
<div class="refsect2">
<span class="refsect2title">threads – </span>
number of threads that insert quads into the database. It should not be less than 1, obviously; it is better to not set it greater than <strong>((N-2)/k)-1</strong> where <strong>N</strong> is the number of available CPU cores and <strong>k</strong> is the number of loadings that happen at the same time.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The return value is not specified and may be changed in future versions.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_rdf_load_rdfxml_mt" />
<div class="example">
<div class="exampletitle" />
<p>The following example demonstrates importing data from the rdf file resource Kingsley_Idehen.rdf which can be downloaded from <a href="http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com/about.rdf">here</a>
</p>
<div>
<pre class="screen">
SQL> DB.DBA.RDF_LOAD_RDFXML_MT (file_to_string_output ('tmp/Kingsley_Idehen.rdf'), '', 'http://mytest.com');
Done. -- 61 msec.
SQL>sparql
select *
from <http://mytest.com>
where {?s ?p ?o};
s p o
VARCHAR VARCHAR VARCHAR
_______________________________________________________________________________
http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#based_near http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.w3.org/2003/01/geo/wgs84_pos#Point
http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#based_near http://www.w3.org/2003/01/geo/wgs84_pos#lat 42.485836
http://www.openlinksw.com/dataspace/person/kidehen@openlinksw.com#based_near http://www.w3.org/2003/01/geo/wgs84_pos#long -71.214287
http://www.openlinksw.com/dataspace/organization/vdb#this http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Organization
http://www.openlinksw.com/dataspace/organization/vdb#this http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Person
http://www.openlinksw.com/dataspace/organization/vdb#this http://xmlns.com/foaf/0.1/nick vdb
http://www.openlinksw.com/dataspace/organization/vdb#this http://xmlns.com/foaf/0.1/name Virtuoso Data Space Bot
http://www.openlinksw.com/dataspace/organization/dav#this http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Organization
http://www.openlinksw.com/dataspace/organization/dav#this http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Person
http://www.openlinksw.com/dataspace/organization/dav#this http://xmlns.com/foaf/0.1/nick dav
10 Rows. -- 30 msec.
</pre>
</div>
<p>The following example demonstrates importing data from the rdf resource with URI: http://www.w3.org/People/Berners-Lee/card</p>
<div>
<pre class="screen">
SQL>create procedure MY_LOAD_FILE (in full_uri varchar, in in_resultset integer := 0)
{
declare REPORT varchar;
declare graph_uri, dattext varchar;
declare app_env any;
app_env := null;
whenever sqlstate '*' goto err_rep;
if (not in_resultset)
result_names (REPORT);
dattext := cast (XML_URI_GET_AND_CACHE (full_uri) as varchar);
MY_SPARQL_REPORT (sprintf ('Downloading %s: %d bytes',
full_uri, length (dattext) ) );
graph_uri := full_uri;
delete from RDF_QUAD where G = DB.DBA.RDF_MAKE_IID_OF_QNAME (graph_uri);
DB.DBA.RDF_LOAD_RDFXML_MT (dattext, full_uri, graph_uri);
return graph_uri;
err_rep:
result (sprintf ('%s: %s', __SQL_STATE, __SQL_MESSAGE));
return graph_uri;
}
;
Done. -- 0 msec.
SQL>create procedure MY_SPARQL_REPORT(in strg varchar)
{
if (__tag(strg) <> 182)
strg := cast (strg as varchar) || sprintf (' -- not a string, tag=%d', __tag(strg));
strg := replace (strg, SPARQL_DAV_DATA_URI(), '\044{SPARQL_DAV_DATA_URI()}');
strg := replace (strg, SPARQL_DAV_DATA_PATH(), '\044{SPARQL_DAV_DATA_PATH()}');
strg := replace (strg, SPARQL_FILE_DATA_ROOT(), '\044{SPARQL_FILE_DATA_ROOT()}');
result (strg);
}
;
Done. -- 0 msec.
SQL> MY_LOAD_FILE('http://www.w3.org/People/Berners-Lee/card');
REPORT
VARCHAR
_______________________________________________________________________________
Downloading http://www.w3.org/People/Berners-Lee/card: 17773 bytes
1 Rows. -- 4046 msec.
SQL>sparql
select *
from <http://www.w3.org/People/Berners-Lee/card>
where {?s ?p ?o} ;
s p o
VARCHAR VARCHAR VARCHAR
__________________________________________________________________________________________________________
http://bblfish.net/people/henry/card#me http://xmlns.com/foaf/0.1/name Henry Story
http://www.w3.org/People/Berners-Lee/card#i http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Person
http://www.w3.org/People/Berners-Lee/card#i http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.w3.org/2000/10/swap/pim/contact#Male
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/nick TimBL
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/nick timbl
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/mbox mailto:timbl@w3.org
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/mbox_sha1sum 965c47c5a70db7407210cef6e4e6f5374a525c5c
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://bblfish.net/people/henry/card#me
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://hometown.aol.com/chbussler/foaf/chbussler.foaf#me
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://danbri.org/foaf#danbri
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://norman.walsh.name/knows/who#norman-walsh
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://www.aaronsw.com/about.xrdf#aaronsw
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://www.ivan-herman.net/foaf.rdf#me
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://www.w3.org/People/Berners-Lee/card#amy
http://www.w3.org/People/Berners-Lee/card#i http://xmlns.com/foaf/0.1/knows http://dig.csail.mit.edu/People/RRS
..........
</pre>
</div>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_rdf_audit_metadata.html">DB.DBA.RDF_AUDIT_METADATA</a>
</p>
<p>
<a href="fn_rdf_backup_metadata.html">DB.DBA.RDF_BACKUP_METADATA</a>
</p>
<p>
<a href="fn_rdf_load_rdfxml.html">DB.DBA.RDF_LOAD_RDFXML</a>
</p>
<p>
<a href="fn_ttlp.html">DB.DBA.TTLP</a>
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<a href="fn_ttlp_mt.html">DB.DBA.TTLP_MT</a>
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