/**
* Inserts a statement into the graph
*
* @param stmt Statement (RDFStatement triple)
* @return true if and only if the query execution was successful
*/
public boolean insertStatement(RDFStatement stmt) {
if (stmt == null) {
return false;
}
try {
stmt.setObject(RDFUtils.escapeString(stmt.getObject()));
String query = "INSERT INTO GRAPH <" + this.graphName + "> { " + stmt.toString() + "}";
VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(query, this.graph);
vur.exec();
return true;
} catch (Exception ex) {
logger.error("Exception while inserting a statement", ex);
}
return false;
}
/**
* Delete a statement from a graph
*
* @param stmt (RDFStatement triple)
* @return true if and only if the query execution was successful
*/
public boolean deleteStatement(RDFStatement stmt) {
if (stmt == null) {
return false;
}
try {
stmt.setObject(RDFUtils.escapeString(stmt.getObject()));
String query =
String.format(
"DELETE FROM GRAPH <%s> { %s }",
this.graphName, RDFUtils.escapeString(stmt.toString()));
VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(query, this.graph);
vur.exec();
return true;
} catch (Exception ex) {
logger.error("Exception while deleting a statement", ex);
}
return false;
}