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Retrieves a single dbo_TNV node from a Neo4j graph database by matching its unique ID property.

Purpose

This function queries a Neo4j database to fetch a specific dbo_TNV node using its ID. It's designed for retrieving individual records from a graph database where nodes are labeled as 'dbo_TNV'. The function returns the first matching node or None if no match is found, making it useful for lookup operations in graph-based data systems.

Source Code

def get_dbo_tnv_by_id(id):
    """Get a dbo_TNV node by its ID"""
    query = """
    MATCH (n:dbo_TNV {id: $id})
    RETURN n
    """
    result = run_query(query, {"id": id})
    return result[0] if result else None

Parameters

Parameter Details

id: The unique identifier of the dbo_TNV node to retrieve. This should match the 'id' property stored on the node in the Neo4j database. The type is not explicitly constrained but typically would be a string or integer depending on how IDs are stored in the database.

Return Value

Returns the first dbo_TNV node object that matches the provided ID if found, or None if no matching node exists. The node object is returned as a Neo4j node record containing all properties of the matched node. The return type is either a Neo4j node object or None.

Dependencies

• neo4j

Required Imports

from neo4j import GraphDatabase

Usage Example

from neo4j import GraphDatabase

# Assuming run_query is defined elsewhere
def run_query(query, params):
    driver = GraphDatabase.driver('bolt://localhost:7687', auth=('neo4j', 'password'))
    with driver.session() as session:
        result = session.run(query, params)
        return [record['n'] for record in result]
    driver.close()

# Use the function
node = get_dbo_tnv_by_id('12345')
if node:
    print(f'Found node: {node}')
else:
    print('Node not found')

Best Practices

• Ensure the run_query function is properly defined and handles Neo4j connection management
• Validate the ID parameter before passing it to prevent injection attacks or invalid queries
• Consider adding error handling for database connection failures or query execution errors
• The function assumes run_query returns a list; ensure this contract is maintained
• Consider adding type hints for better code documentation (e.g., def get_dbo_tnv_by_id(id: str) -> Optional[Node])
• Ensure proper indexing on the 'id' property in Neo4j for optimal query performance
• Always check if the return value is None before accessing node properties to avoid AttributeError

Tags

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