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

Purpose

This function queries a Neo4j database to find and return a specific dbo_TNV node based on its UID property. It's designed for retrieving individual TNV (likely a domain-specific entity type) records when the exact UID is known. The function returns the first matching node or None if no match is found.

Source Code

def get_dbo_tnv_by_uid(uid):
    """Get a dbo_TNV node by its UID"""
    query = """
    MATCH (n:dbo_TNV {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_TNV node to retrieve. Expected to be a string or numeric value that matches the UID property stored in the Neo4j database. This should be a valid, existing UID for a dbo_TNV node.

Return Value

Returns the first dbo_TNV node object that matches the provided UID, or None if no matching node is found. The node object is typically a dictionary-like structure containing all properties of the matched Neo4j node. The return type is either a Neo4j node record or None.

Dependencies

• neo4j

Required Imports

from neo4j import GraphDatabase

Usage Example

# Assuming run_query function is defined and Neo4j is configured
# Example run_query implementation:
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()

# Using get_dbo_tnv_by_uid
uid_to_find = '12345'
tnv_node = get_dbo_tnv_by_uid(uid_to_find)

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

Best Practices

• Ensure the run_query function is properly implemented with error handling and connection management
• Validate the uid parameter before passing it to prevent injection attacks or invalid queries
• Consider adding error handling for database connection failures
• The function assumes run_query returns a list; ensure this contract is maintained
• Close Neo4j driver connections properly in the run_query implementation to prevent resource leaks
• Consider adding logging for debugging purposes when nodes are not found
• If UIDs are expected to be unique, this function's behavior is correct; otherwise, consider that only the first match is returned

Tags

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