SLV2Value
slv2_results_get_binding_value(SLV2Results results, unsigned index)
{
return slv2_value_from_librdf_node(results->world,
librdf_query_results_get_binding_value(
results->rdf_results, index));
}
SLV2Values
slv2_query_get_variable_bindings(SLV2World world,
SLV2Results results,
int variable)
{
SLV2Values result = NULL;
if (!librdf_query_results_finished(results->rdf_results))
result = slv2_values_new();
while (!librdf_query_results_finished(results->rdf_results)) {
librdf_node* node = librdf_query_results_get_binding_value(results->rdf_results, variable);
if (node == NULL) {
fprintf(stderr, "SLV2 ERROR: Variable %d bound to NULL.\n", variable);
librdf_query_results_next(results->rdf_results);
continue;
}
SLV2Value val = slv2_value_from_librdf_node(world, node);
if (val)
raptor_sequence_push(result, val);
librdf_free_node(node);
librdf_query_results_next(results->rdf_results);
}
return result;
}
void
slv2_port_get_range(SLV2Plugin p,
SLV2Port port,
SLV2Value* def,
SLV2Value* min,
SLV2Value* max)
{
if (def)
*def = NULL;
if (min)
*min = NULL;
if (max)
*max = NULL;
char* query = slv2_strjoin(
"SELECT DISTINCT ?def ?min ?max WHERE {\n"
"<", slv2_value_as_uri(p->plugin_uri), "> lv2:port ?port .\n"
"?port lv2:symbol \"", slv2_value_as_string(port->symbol), "\".\n",
"OPTIONAL { ?port lv2:default ?def }\n",
"OPTIONAL { ?port lv2:minimum ?min }\n",
"OPTIONAL { ?port lv2:maximum ?max }\n",
"\n}", NULL);
librdf_query_results* results = slv2_plugin_query(p, query);
while (!librdf_query_results_finished(results)) {
librdf_node* def_node = librdf_query_results_get_binding_value(results, 0);
librdf_node* min_node = librdf_query_results_get_binding_value(results, 1);
librdf_node* max_node = librdf_query_results_get_binding_value(results, 2);
if (def && def_node && !*def)
*def = slv2_value_new_librdf_node(p->world, def_node);
if (min && min_node && !*min)
*min = slv2_value_new_librdf_node(p->world, min_node);
if (max && max_node && !*max)
*max = slv2_value_new_librdf_node(p->world, max_node);
if ((!def || *def) && (!min || *min) && (!max || *max))
break;
librdf_query_results_next(results);
}
librdf_free_query_results(results);
free(query);
}
RdfStorePrivate::ResultMap RdfStorePrivate::ExecuteTupleQuery(const std::string& query) const
{
RdfStorePrivate::ResultMap resultMap;
const std::string completeQuery = this->PrependPrefixes(query);
librdf_query* rdfQuery = librdf_new_query(m_World, "sparql", nullptr, (const unsigned char*) completeQuery.c_str(), nullptr);
if (!rdfQuery) return resultMap;
librdf_query_results* results = librdf_query_execute(rdfQuery, m_Model);
if (!results)
{
librdf_free_query(rdfQuery);
return resultMap;
}
if (!librdf_query_results_is_bindings(results))
{
librdf_free_query_results(results);
librdf_free_query(rdfQuery);
return resultMap;
}
while (!librdf_query_results_finished(results))
{
int count = librdf_query_results_get_bindings_count(results);
for (int i = 0; i < count; ++i)
{
const char *name = librdf_query_results_get_binding_name(results, i);
if (!name) continue;
std::string key = name;
std::list<RdfNode> list;
if(!resultMap[key].empty())
{
list = resultMap[key];
}
librdf_node *node = librdf_query_results_get_binding_value(results, i);
list.push_back(LibRdfNodeToRdfNode(node));
resultMap[key] = list;
}
librdf_query_results_next(results);
}
librdf_free_query_results(results);
librdf_free_query(rdfQuery);
return resultMap;
}
SLV2ScalePoints
slv2_port_get_scale_points(SLV2Plugin p,
SLV2Port port)
{
char* query = slv2_strjoin(
"SELECT DISTINCT ?value ?label WHERE {\n"
"<", slv2_value_as_uri(p->plugin_uri), "> lv2:port ?port .\n"
"?port lv2:symbol \"", slv2_value_as_string(port->symbol), "\" ;\n",
" lv2:scalePoint ?point .\n"
"?point rdf:value ?value ;\n"
" rdfs:label ?label .\n"
"\n} ORDER BY ?value", NULL);
librdf_query_results* results = slv2_plugin_query(p, query);
SLV2ScalePoints ret = NULL;
if (!librdf_query_results_finished(results))
ret = slv2_scale_points_new();
while (!librdf_query_results_finished(results)) {
librdf_node* value_node = librdf_query_results_get_binding_value(results, 0);
librdf_node* label_node = librdf_query_results_get_binding_value(results, 1);
SLV2Value value = slv2_value_new_librdf_node(p->world, value_node);
SLV2Value label = slv2_value_new_librdf_node(p->world, label_node);
raptor_sequence_push(ret, slv2_scale_point_new(value, label));
librdf_query_results_next(results);
}
librdf_free_query_results(results);
free(query);
assert(!ret || slv2_values_size(ret) > 0);
return ret;
}
void run_query2(librdf_world* world, librdf_model* model, const std::string& q)
{
librdf_stream* strm;
std::cout << "** Query: " << q << std::endl;
librdf_uri* uri1 =
librdf_new_uri(world, (const unsigned char*) "http://bunchy.org");
if (uri1 == 0)
throw std::runtime_error("Couldn't parse URI");
librdf_uri* uri2 =
librdf_new_uri(world, (const unsigned char*) "http://bunchy.org");
if (uri2 == 0)
throw std::runtime_error("Couldn't parse URI");
librdf_query* qry =
librdf_new_query(world, "sparql", uri1,
(const unsigned char*) q.c_str(),
uri2);
librdf_free_uri(uri1);
librdf_free_uri(uri2);
if (qry == 0)
throw std::runtime_error("Couldn't parse query.");
librdf_query_results* results = librdf_query_execute(qry, model);
if (results == 0)
throw std::runtime_error("Couldn't execute query");
librdf_free_query(qry);
std::cout << "--------------------------------------------------------"
<< std::endl;
while (true) {
if (librdf_query_results_finished(results)) break;
int bcount = librdf_query_results_get_bindings_count(results);
if (bcount < 0)
throw std::runtime_error("Couldn't get query bindings count");
for(int i = 0; i < bcount; i++) {
if (i != 0) std::cout << " ";
librdf_node* value =
librdf_query_results_get_binding_value(results, i);
if (value == 0)
throw std::runtime_error("Couldn't get results binding");
output_node(value);
librdf_free_node(value);
}
std::cout << std::endl;
librdf_query_results_next(results);
}
std::cout << "--------------------------------------------------------"
<< std::endl;
librdf_free_query_results(results);
}
int
print_query_results(librdf_world* world, librdf_model* model, librdf_query_results *results)
{
int i;
char *name;
librdf_stream* stream;
librdf_serializer* serializer;
const char *query_graph_serializer_syntax_name="rdfxml";
if(librdf_query_results_is_bindings(results)) {
fprintf(stdout, ": Query returned bindings results:\n");
while(!librdf_query_results_finished(results)) {
fputs("result: [", stdout);
for(i=0; i<librdf_query_results_get_bindings_count(results); i++) {
librdf_node *value=librdf_query_results_get_binding_value(results, i);
name=(char*)librdf_query_results_get_binding_name(results, i);
if(i>0)
fputs(", ", stdout);
fprintf(stdout, "%s=", name);
if(value) {
librdf_node_print(value, stdout);
librdf_free_node(value);
} else
fputs("NULL", stdout);
}
fputs("]\n", stdout);
librdf_query_results_next(results);
}
fprintf(stdout, ": Query returned %d results\n", librdf_query_results_get_count(results));
} else if(librdf_query_results_is_boolean(results)) {
fprintf(stdout, ": Query returned boolean result: %s\n", librdf_query_results_get_boolean(results) ? "true" : "false");
} else if(librdf_query_results_is_graph(results)) {
librdf_storage* tmp_storage;
librdf_model* tmp_model;
tmp_storage=librdf_new_storage(world, NULL, NULL, NULL);
tmp_model=librdf_new_model(world, tmp_storage, NULL);
fprintf(stdout, ": Query returned graph result:\n");
stream=librdf_query_results_as_stream(results);
if(!stream) {
fprintf(stderr, ": Failed to get query results graph\n");
return -1;
}
librdf_model_add_statements(tmp_model, stream);
librdf_free_stream(stream);
fprintf(stdout, ": Total %d triples\n", librdf_model_size(model));
serializer=librdf_new_serializer(world, query_graph_serializer_syntax_name, NULL, NULL);
if(!serializer) {
fprintf(stderr, ": Failed to create serializer type %s\n", query_graph_serializer_syntax_name);
return -1;
}
librdf_serializer_serialize_model_to_file_handle(serializer, stdout, NULL, tmp_model);
librdf_free_serializer(serializer);
librdf_free_model(tmp_model);
librdf_free_storage(tmp_storage);
} else {
fprintf(stdout, ": Query returned unknown result format\n");
return -1;
}
return 0;
}
