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
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.