MssqlHook airflow connection

问题

I am new to using airflow and what I need to do is to use MssqlHook but I do not know how. What elements should I give in the constructor?

I have a connection in airflow with name connection_test.

I do not fully understand the attributes in the class:

class MsSqlHook(DbApiHook):
    """
    Interact with Microsoft SQL Server.
    """

    conn_name_attr = 'mssql_conn_id'
    default_conn_name = 'mssql_default'
    supports_autocommit = True

I have the following code:

sqlhook=MsSqlHook(connection_test)
sqlhook.get_conn()

And when I do this the error is Connection failed for unknown reason.

How should I do in order to make it work with the airflow connection ?

What I need is to call function .get_conn() for the MsSqlHook.

回答1:

See the standard examples of Airflow.

https://github.com/gtoonstra/etl-with-airflow/blob/master/examples/mssql-example/dags/mssql_bcp_example.py

E.g.:

t1 = MsSqlImportOperator(task_id='import_data',
                         table_name='test.test',
                         generate_synth_data=generate_synth_data,
                         mssql_conn_id='mssql',
                         dag=dag)

EDIT

hook = MsSqlHook(mssql_conn_id="my_mssql_conn")
hook.run(sql)

You need to provide the connection defined in Connections. Also if using Hooks looking in the respective Operators usually yields some information about usage. This code is from the MSSQLOperator.

来源：https://stackoverflow.com/questions/51859197/mssqlhook-airflow-connection