def check_good(self, q, sql):
select = self.syntax.parse(q, {})
qb = QueryBuilder(select)
sql2 = qb.build()
self.assertEqual(sql, sql2)
def sparql_query(self, q, mime_type, default_graph_uri, timeout):
"""Execute a SPARQL query
@param query The query string
@param mime_type The requested MIME type
@param default_graph_uri The default graph URI
@param start_response The response object
@param timeout The timeout (in seconds) on the query
"""
try:
syntax = YuzuQLSyntax()
try:
select = syntax.parse(q, {
PREFIX1_QN: FullURI("<%s>" % PREFIX1_URI),
PREFIX2_QN: FullURI("<%s>" % PREFIX2_URI),
PREFIX3_QN: FullURI("<%s>" % PREFIX3_URI),
PREFIX4_QN: FullURI("<%s>" % PREFIX4_URI),
PREFIX5_QN: FullURI("<%s>" % PREFIX5_URI),
PREFIX6_QN: FullURI("<%s>" % PREFIX6_URI),
PREFIX7_QN: FullURI("<%s>" % PREFIX7_URI),
PREFIX8_QN: FullURI("<%s>" % PREFIX8_URI),
PREFIX9_QN: FullURI("<%s>" % PREFIX9_URI),
"rdf": FullURI("<http://www.w3.org/1999/02/22-"
"rdf-syntax-ns#>"),
"rdfs": FullURI("<http://www.w3.org/2000/01/rdf-schema#>"),
"owl": FullURI("<http://www.w3.org/2002/07/owl#>"),
"dc": FullURI("<http://purl.org/dc/elements/1.1/>"),
"dct": FullURI("<http://purl.org/dc/terms>"),
"xsd": FullURI("<http://www.w3.org/2001/XMLSchema#>")})
except YuzuQLError as e:
return False, 'error', e.value
if select.limit < 0 or (select.limit >= YUZUQL_LIMIT and
YUZUQL_LIMIT >= 0):
return False, 'error', YZ_QUERY_LIMIT_EXCEEDED % YUZUQL_LIMIT
qb = QueryBuilder(select)
sql_query = qb.build()
conn = sqlite3.connect(self.db)
cursor = conn.cursor()
cursor.execute(sql_query)
vars = qb.vars()
if mime_type == "sparql-json":
results = sql_results_to_sparql_json(cursor.fetchall(), vars)
else:
results = sql_results_to_sparql_xml(cursor.fetchall(), vars)
conn.close()
return False, 'sparql', results
except Exception as e:
if SPARQL_ENDPOINT:
graph = Graph('SPARQLStore')
try:
graph.open(SPARQL_ENDPOINT)
try:
if default_graph_uri:
qres = graph.query(q, initNs=default_graph_uri)
else:
qres = graph.query(q)
except Exception as e:
traceback.print_exc()
print(e)
return False, 'error', YZ_BAD_REQUEST
if qres.type == "CONSTRUCT" or qres.type == "DESCRIBE":
if mime_type == "html" or mime_type == "json-ld":
mime_type == "pretty-xml"
return (False, mime_type,
qres.serialize(format=mime_type))
elif (self.mime_type == 'sparql' or
self.mime_type == 'sparql-json' or
self.mime_type == 'html'):
return False, 'sparql', qres.serialize()
else:
return False, 'error', YZ_BAD_MIME
finally:
graph.close()
else:
traceback.print_exc()
print(e)
return False, 'error', ""