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Retrieves a single dbo_ConceptHouses node from a Neo4j graph database by matching its unique identifier (UID).

Purpose

This function queries a Neo4j database to fetch a specific dbo_ConceptHouses node using its UID property. It's designed for retrieving individual concept house records from a knowledge graph, likely part of a DBpedia ontology implementation. The function returns the first matching node or None if no match is found.

Source Code

def get_dbo_concepthouses_by_uid(uid):
    """Get a dbo_ConceptHouses node by its UID"""
    query = """
    MATCH (n:dbo_ConceptHouses {UID: $uid})
    RETURN n
    """
    result = run_query(query, {"uid": uid})
    return result[0] if result else None

Parameters

Parameter Details

uid: The unique identifier (UID) of the dbo_ConceptHouses node to retrieve. Expected to be a string or value that matches the UID property stored in the Neo4j database. This should be a valid identifier that exists in the database's dbo_ConceptHouses nodes.

Return Value

Returns a dictionary or node object representing the matched dbo_ConceptHouses node if found, or None if no node with the specified UID exists. The returned object contains all properties of the matched node. The function uses indexing (result[0]) to return only the first match, assuming UIDs are unique.

Dependencies

• neo4j

Required Imports

from neo4j import GraphDatabase

Usage Example

# Assuming run_query is defined and Neo4j connection is configured
# Example run_query implementation:
from neo4j import GraphDatabase

driver = GraphDatabase.driver('bolt://localhost:7687', auth=('neo4j', 'password'))

def run_query(query, params):
    with driver.session() as session:
        result = session.run(query, params)
        return [record['n'] for record in result]

# Using the function
uid_to_find = 'concept_house_12345'
node = get_dbo_concepthouses_by_uid(uid_to_find)

if node:
    print(f'Found node: {node}')
else:
    print('No node found with that UID')

Best Practices

• Ensure the UID parameter is properly validated before calling this function to avoid unnecessary database queries
• The function assumes UIDs are unique and returns only the first match; verify this assumption holds for your data model
• Consider adding error handling for database connection issues or query failures
• The run_query function must be properly implemented with connection management and error handling
• Consider adding type hints for better code documentation (e.g., def get_dbo_concepthouses_by_uid(uid: str) -> Optional[Dict])
• Ensure proper indexing on the UID property in Neo4j for optimal query performance
• Close database connections properly in the run_query implementation to avoid resource leaks

Tags

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