def single(graph: str, entity: str, as_element: Union[str, None], limit: int) -> Dict[str, List[Dict[str, str]]]:
"""Finds triples which the given entity is a part of (as subject, predicate, object, or any)"""
results = {'subject': None, 'predicate': None, 'object': None}
if as_element is None or as_element == 'subject':
client.setQuery('SELECT DISTINCT ?predicate ?predicateLabel ?object ?objectLabel FROM <%s> WHERE {'
'<%s> ?predicate ?object '
'OPTIONAL { ?predicate <http://www.w3.org/2000/01/rdf-schema#label> ?predicateLabel } '
'OPTIONAL { ?object <http://www.w3.org/2000/01/rdf-schema#label> ?objectLabel } '
'}' % (graph, entity))
results['subject'] = client.query().convert()['results']['bindings'][:limit]
if as_element is None or as_element == 'predicate':
client.setQuery('SELECT DISTINCT ?subject ?subjectLabel ?object ?objectLabel WHERE {'
'?subject <%s> ?object '
'OPTIONAL { ?subject <http://www.w3.org/2000/01/rdf-schema#label> ?subjectLabel } '
'OPTIONAL { ?object <http://www.w3.org/2000/01/rdf-schema#label> ?objectLabel } '
'}' % entity)
results['predicate'] = client.query().convert()['results']['bindings'][:limit]
if as_element is None or as_element == 'object':
client.setQuery('SELECT DISTINCT ?subject ?subjectLabel ?predicate ?predicateLabel WHERE {'
'?subject ?predicate <%s> '
'OPTIONAL { ?subject <http://www.w3.org/2000/01/rdf-schema#label> ?subjectLabel } '
'OPTIONAL { ?predicate <http://www.w3.org/2000/01/rdf-schema#label> ?predicateLabel } '
'}' % entity)
results['object'] = client.query().convert()['results']['bindings'][:limit]
return results
def single(triple: Tuple[str, str, str], graph: str) -> str:
"""Deletes a triple from the graph database"""
client.setQuery('DELETE DATA { GRAPH <%s> {<%s> <%s> <%s>} }' %
(graph, triple[0], triple[1], triple[2]))
try:
return client.query().convert(
)['results']['bindings'][0]['callret-0']['value']
except Exception:
return str(client.query().convert())
def single(triple: Tuple[str, str, str], graph: str) -> bool:
"""Checks whether a triple exists in the graph"""
client.setQuery(
'SELECT DISTINCT ?predicate WHERE { GRAPH <%s> {<%s> ?predicate <%s>} }'
% (graph, triple[0], triple[2]))
response = client.query().convert()['results']['bindings']
for item in response:
if triple[1] == item['predicate']['value']:
return True
return False
def fetch(perfect_match: bool):
if perfect_match:
terms = ['"%s"' % term for term in label.strip().split(' ')]
else:
# Each word in the search term needs at least four characters to be included in partial search
# The asterisk (*) indicates partial search
terms = ['"%s*"' % term if len(term) > 3 else '"%s"' % term for term in label.strip().split(' ')]
# Search terms are joined by 'AND' operators
client.setQuery('SELECT DISTINCT ?entity, ?label, ?type FROM <%s> WHERE {'
'?entity <http://www.w3.org/2000/01/rdf-schema#label> ?label ; a ?type .'
'?label bif:contains \'%s\' %s} %s' % (graph, ' and '.join(terms), language_filter, limit_filter))
return client.query().convert()['results']['bindings']