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Diffstat (limited to 'www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/RepositoryConnectors/VirtuosoRepositoryConnector.php')
| -rw-r--r-- | www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/RepositoryConnectors/VirtuosoRepositoryConnector.php | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/RepositoryConnectors/VirtuosoRepositoryConnector.php b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/RepositoryConnectors/VirtuosoRepositoryConnector.php new file mode 100644 index 00000000..e7a57e4d --- /dev/null +++ b/www/wiki/extensions/SemanticMediaWiki/src/SPARQLStore/RepositoryConnectors/VirtuosoRepositoryConnector.php @@ -0,0 +1,175 @@ +<?php + +namespace SMW\SPARQLStore\RepositoryConnectors; + +use SMW\SPARQLStore\Exception\BadHttpEndpointResponseException; + +/** + * Virtuoso specific adjustments for GenericRepositoryConnector + * + * Specific modifications of the SPARQL database implementation for Virtuoso. + * In particular, Virtuoso does not support SPARQL Update but only the non-standard + * SPARUL protocol that requires different syntax for update queries. + * If future versions of Virtuoso support SPARQL Update, the standard SPARQL + * database connector should work properly. + * + * Virtuoso uses the SPARQL query endpoint for updates as well. So both + * - $smwgSparqlEndpoint['update'] and + * - $smwgSparqlEndpoint['query'] should be something like 'http://localhost:8890/sparql/'. + * - $smwgSparqlEndpoint['data'] should be left empty. + * + * A graph is always needed, i.e., $smwgSparqlDefaultGraph must be set to some + * graph name (URI). + * + * Known limitations: + * (might be fixed in recent Virtuoso versions, please let us know) + * + * - Data endpoint not tested: $smwgSparqlEndpoint['data'] should be left empty + * - Numerical datatypes are not supported properly, and Virtuoso + * will miss query results when query conditions require number values. + * This also affects Type:Date properties since the use numerical values for + * querying. + * - Some edit (insert) queries fail for unknown reasons, probably related to + * unusual/complex input data (e.g., using special characters in strings); + * errors will occur when trying to store such values on a page. + * - Virtuoso stumbles over XSD dates with negative years, even if they have + * only four digits as per ISO. Trying to store such data will cause errors. + * + * @ingroup Sparql + * + * @license GNU GPL v2+ + * @since 1.7.1 + * + * @author Markus Krötzsch + */ +class VirtuosoRepositoryConnector extends GenericRepositoryConnector { + + /** + * DELETE wrapper. + * The function declares the standard namespaces wiki, swivt, rdf, owl, + * rdfs, property, xsd, so these do not have to be included in + * $extraNamespaces. + * + * @param $deletePattern string CONSTRUCT pattern of tripples to delete + * @param $where string condition for data to delete + * @param $extraNamespaces array (associative) of namespaceId => namespaceUri + * @return boolean stating whether the operations succeeded + */ + public function delete( $deletePattern, $where, $extraNamespaces = [] ) { + + $defaultGraph = $this->repositoryClient->getDefaultGraph(); + + $sparql = self::getPrefixString( $extraNamespaces ) . "DELETE" . + ( ( $defaultGraph !== '' )? " FROM <{$defaultGraph}> " : '' ) . + "{ $deletePattern } WHERE { $where }"; + + return $this->doUpdate( $sparql ); + } + + /** + * INSERT DELETE wrapper. + * The function declares the standard namespaces wiki, swivt, rdf, owl, + * rdfs, property, xsd, so these do not have to be included in + * $extraNamespaces. + * + * @param $insertPattern string CONSTRUCT pattern of tripples to insert + * @param $deletePattern string CONSTRUCT pattern of tripples to delete + * @param $where string condition for data to delete + * @param $extraNamespaces array (associative) of namespaceId => namespaceUri + * @return boolean stating whether the operations succeeded + */ + public function insertDelete( $insertPattern, $deletePattern, $where, $extraNamespaces = [] ) { + + $defaultGraph = $this->repositoryClient->getDefaultGraph(); + + $sparql = self::getPrefixString( $extraNamespaces ) . "MODIFY" . + ( ( $defaultGraph !== '' )? " GRAPH <{$defaultGraph}> " : '' ) . + "DELETE { $deletePattern } INSERT { $insertPattern } WHERE { $where }"; + + return $this->doUpdate( $sparql ); + } + + /** + * INSERT DATA wrapper. + * The function declares the standard namespaces wiki, swivt, rdf, owl, + * rdfs, property, xsd, so these do not have to be included in + * $extraNamespaces. + * + * @param $triples string of triples to insert + * @param $extraNamespaces array (associative) of namespaceId => namespaceUri + * @return boolean stating whether the operations succeeded + */ + public function insertData( $triples, $extraNamespaces = [] ) { + + if ( $this->repositoryClient->getDataEndpoint() !== '' ) { + $turtle = self::getPrefixString( $extraNamespaces, false ) . $triples; + return $this->doHttpPost( $turtle ); + } + + $defaultGraph = $this->repositoryClient->getDefaultGraph(); + + $sparql = self::getPrefixString( $extraNamespaces, true ) . + "INSERT DATA " . + ( ( $defaultGraph !== '' )? "INTO GRAPH <{$defaultGraph}> " : '' ) . + "{ $triples }"; + + return $this->doUpdate( $sparql ); + } + + /** + * DELETE DATA wrapper. + * The function declares the standard namespaces wiki, swivt, rdf, owl, + * rdfs, property, xsd, so these do not have to be included in + * $extraNamespaces. + * + * @param $triples string of triples to delete + * @param $extraNamespaces array (associative) of namespaceId => namespaceUri + * @return boolean stating whether the operations succeeded + */ + public function deleteData( $triples, $extraNamespaces = [] ) { + + $defaultGraph = $this->repositoryClient->getDefaultGraph(); + + $sparql = self::getPrefixString( $extraNamespaces ) . + "DELETE DATA " . + ( ( $defaultGraph !== '' )? "FROM GRAPH <{$defaultGraph}> " : '' ) . + "{ $triples }"; + + return $this->doUpdate( $sparql ); + } + + /** + * Execute a SPARQL update and return a boolean to indicate if the + * operations was successful. + * + * Virtuoso expects SPARQL updates to be posted using the "query" + * parameter (rather than "update"). + * + * @param $sparql string with the complete SPARQL update query (INSERT or DELETE) + * @return boolean + */ + public function doUpdate( $sparql ) { + + if ( $this->repositoryClient->getUpdateEndpoint() === '' ) { + throw new BadHttpEndpointResponseException( BadHttpEndpointResponseException::ERROR_NOSERVICE, $sparql, 'not specified' ); + } + + $this->httpRequest->setOption( CURLOPT_URL, $this->repositoryClient->getUpdateEndpoint() ); + $this->httpRequest->setOption( CURLOPT_POST, true ); + + $parameterString = "query=" . urlencode( $sparql ); + + $this->httpRequest->setOption( CURLOPT_POSTFIELDS, $parameterString ); + $this->httpRequest->execute(); + + if ( $this->httpRequest->getLastErrorCode() == 0 ) { + return true; + } + + $this->mapHttpRequestError( $this->repositoryClient->getUpdateEndpoint(), $sparql ); + + return false; + } + +} + |