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load_to_neo4j.py
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load_to_neo4j.py
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import os
from neo4j import GraphDatabase
import glob
import logging
logging.basicConfig(level=logging.INFO)
def get_env_variable(var_name):
try:
return os.environ[var_name]
except KeyError:
error_msg = f"Environment variable {var_name} not set."
logging.error(error_msg)
raise Exception(error_msg)
def execute_single_query(session, query):
try:
session.run(query)
except Exception as e:
logging.error(f"Failed to execute query: {query}. Error: {e}")
def execute_cypher_file(session, cypher_file):
with open(cypher_file, 'r') as f:
content = f.read()
queries = content.split(';')
for query in queries:
query = query.strip()
if query:
execute_single_query(session, query)
logging.info(f"Loaded {cypher_file}")
def execute_cypher_files(driver, cypher_files, label, database_name):
logging.info(f"Starting to load {label} into {database_name}...")
with driver.session(database=database_name) as session:
for cypher_file in cypher_files:
execute_cypher_file(session, cypher_file)
logging.info(f"Finished loading {label} into {database_name}.")
def main():
DB_URL = get_env_variable("DB_URL")
DB_USERNAME = get_env_variable("DB_USERNAME")
DB_PASSWORD = get_env_variable("DB_PASSWORD")
DB_NAME = get_env_variable("DB_NAME")
driver = GraphDatabase.driver(DB_URL, auth=(DB_USERNAME, DB_PASSWORD))
node_cypher_files = glob.glob("cypher/node_*.cypher")
execute_cypher_files(driver, node_cypher_files, "nodes", DB_NAME)
edge_cypher_files = glob.glob("cypher/edge_*.cypher")
execute_cypher_files(driver, edge_cypher_files, "edges", DB_NAME)
if __name__ == "__main__":
main()