load_graph.py

import sys
from rdflib import Graph

g = Graph()
g.parse("data/northwind-ontology.ttl", format="turtle")
g.parse("data/dumpdataNTRIPLE7.nt", format="nt")

print(f"Graph has {len(g)} triples.")

if len(sys.argv) < 3:
    print("Usage: python load_graph.py <ENTITY_TYPE> <ENTITY_CODE>")
    sys.exit(1)


entity_type = sys.argv[1].strip().lower()
entity_number_or_name = sys.argv[2]
if entity_type != "customer" and not entity_number_or_name.isdigit():
    print("Error: Entity number must be numeric for types other than 'customer'.")
    sys.exit(1)

query = f'''
PREFIX : <http://www.mysparql.com/resource/northwind/>
SELECT ?s ?p ?o WHERE {{
    ?s ?p ?o .
    FILTER(?s = :{entity_type}-{entity_number_or_name})
}} 
'''
results = g.query(query)
found = False
for row in results:
    print(f"{row['s']}, {row['p']}, {row['o']}")
    found = True
if not found:
    print(f"No results found for {entity_type} number {entity_number_or_name}.")