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.. _howto/operator:Neo4jOperator:

Neo4jOperator
=============

Use the :class:`~airflow.providers.neo4j.operators.Neo4jOperator` to execute
Cypher queries in a `Neo4j <https://neo4j.com/>`__ database.


Using the Operator
^^^^^^^^^^^^^^^^^^

Use the ``neo4j_conn_id`` argument to connect to your Neo4j instance where
the connection metadata is structured as follows:

.. list-table:: Neo4j Airflow Connection Metadata
   :widths: 25 25
   :header-rows: 1

   * - Parameter
     - Input
   * - Host: string
     - Neo4j hostname
   * - Schema: string
     - Database name
   * - Login: string
     - Neo4j user
   * - Password: string
     - Neo4j user password
   * - Port: int
     - Neo4j port

.. exampleinclude:: /../../neo4j/tests/system/neo4j/example_neo4j.py
    :language: python
    :dedent: 4
    :start-after: [START run_query_neo4j_operator]
    :end-before: [END run_query_neo4j_operator]

Passing parameters into the query
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Neo4jOperator provides ``parameters`` argument to pass parameters into the
query. This allows you to use placeholders in your parameterized query and
substitute them with actual values at execution time.

When using the ``parameters`` argument, you should prefix placeholders in your
query using the ``$`` syntax. For example, if your query uses a placeholder
like ``$name``, you would provide the parameters as ``{"name": "value"}`` in
the operator. This allows you to write dynamic queries without having to
concatenate strings. This is particularly useful when you want to execute
the same query with different values, or use values from the Airflow
context, such as task instance parameters or variables.

.. exampleinclude:: /../../neo4j/tests/system/neo4j/example_neo4j.py
    :language: python
    :dedent: 4
    :start-after: [START run_query_neo4j_operator_with_parameters]
    :end-before: [END run_query_neo4j_operator_with_parameters]
