Connecting to a Yandex Managed Service for Apache Airflow™ database

You can connect to a Managed Service for Apache Airflow™ database using software and update connection data using a directed acyclic graph (DAG).

Prepare the DAG file and run the graphPrepare the DAG file and run the graph

1. Create a local file named update_connections.py and paste the following script to it:

   import json
   from airflow.decorators import dag, task
   from airflow.settings import Session
   from airflow.models import Connection
   
   
   @dag(schedule=None)
   def update_connections():
       @task
       def update_connections_task():
           with Session() as session:
               connections = session.query(Connection)
               for conn in connections:
                   extra = conn.extra_dejson
                   print(f"extra: {extra}")
                   update_count = extra.get('update_count', 0)
                   extra['update_count'] = update_count + 1
                   conn.set_extra(json.dumps(extra))
                   session.add(conn)
               session.commit()
   
       update_connections_task()
   
   
   update_connections()
   

2. Upload the update_connections.py DAG file to the bucket you created earlier. This will automatically create a graph with the same name in the Apache Airflow™ web interface.

3. Open the Apache Airflow™ web interface.

4. Make sure a new graph named update_connections has appeared in the DAGs section.

   It may take a few minutes to load a DAG file from the bucket.

5. To run the graph, click in the line with its name.

Check the resultCheck the result

To check the result in the Apache Airflow™ web interface:

1. In the DAGs section, click update_connections.
2. Go to the Graph section.
3. Select update_connections_task.
4. Go to Logs.
5. Make sure the logs contain a list of updated connections. This means the query was successful.