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# to you under the Apache License, Version 2.0 (the
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# http://www.apache.org/licenses/LICENSE-2.0
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"""
Example use of MsSql related operators.
"""
# [START mssql_operator_howto_guide]
from datetime import datetime
from airflow import DAG
from airflow.providers.microsoft.mssql.hooks.mssql import MsSqlHook
from airflow.providers.microsoft.mssql.operators.mssql import MsSqlOperator
dag = DAG(
'example_mssql',
schedule_interval='@daily',
start_date=datetime(2021, 10, 1),
tags=['example'],
catchup=False,
)
# [START howto_operator_mssql]
# Example of creating a task to create a table in MsSql
create_table_mssql_task = MsSqlOperator(
task_id='create_country_table',
mssql_conn_id='airflow_mssql',
sql=r"""
CREATE TABLE Country (
country_id INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
name TEXT,
continent TEXT
);
""",
dag=dag,
)
# [END howto_operator_mssql]
# [START mssql_hook_howto_guide_insert_mssql_hook]
@dag.task(task_id="insert_mssql_task")
def insert_mssql_hook():
mssql_hook = MsSqlHook(mssql_conn_id='airflow_mssql', schema='airflow')
rows = [
('India', 'Asia'),
('Germany', 'Europe'),
('Argentina', 'South America'),
('Ghana', 'Africa'),
('Japan', 'Asia'),
('Namibia', 'Africa'),
]
target_fields = ['name', 'continent']
mssql_hook.insert_rows(table='Country', rows=rows, target_fields=target_fields)
# [END mssql_hook_howto_guide_insert_mssql_hook]
# [START mssql_operator_howto_guide_create_table_mssql_from_external_file]
# Example of creating a task that calls an sql command from an external file.
create_table_mssql_from_external_file = MsSqlOperator(
task_id='create_table_from_external_file',
mssql_conn_id='airflow_mssql',
sql='create_table.sql',
dag=dag,
)
# [END mssql_operator_howto_guide_create_table_mssql_from_external_file]
# [START mssql_operator_howto_guide_populate_user_table]
populate_user_table = MsSqlOperator(
task_id='populate_user_table',
mssql_conn_id='airflow_mssql',
sql=r"""
INSERT INTO Users (username, description)
VALUES ( 'Danny', 'Musician');
INSERT INTO Users (username, description)
VALUES ( 'Simone', 'Chef');
INSERT INTO Users (username, description)
VALUES ( 'Lily', 'Florist');
INSERT INTO Users (username, description)
VALUES ( 'Tim', 'Pet shop owner');
""",
)
# [END mssql_operator_howto_guide_populate_user_table]
# [START mssql_operator_howto_guide_get_all_countries]
get_all_countries = MsSqlOperator(
task_id="get_all_countries",
mssql_conn_id='airflow_mssql',
sql=r"""SELECT * FROM Country;""",
)
# [END mssql_operator_howto_guide_get_all_countries]
# [START mssql_operator_howto_guide_get_all_description]
get_all_description = MsSqlOperator(
task_id="get_all_description",
mssql_conn_id='airflow_mssql',
sql=r"""SELECT description FROM Users;""",
)
# [END mssql_operator_howto_guide_get_all_description]
# [START mssql_operator_howto_guide_params_passing_get_query]
get_countries_from_continent = MsSqlOperator(
task_id="get_countries_from_continent",
mssql_conn_id='airflow_mssql',
sql=r"""SELECT * FROM Country where {{ params.column }}='{{ params.value }}';""",
params={"column": "CONVERT(VARCHAR, continent)", "value": "Asia"},
)
# [END mssql_operator_howto_guide_params_passing_get_query]
(
create_table_mssql_task
>> insert_mssql_hook()
>> create_table_mssql_from_external_file
>> populate_user_table
>> get_all_countries
>> get_all_description
>> get_countries_from_continent
)
# [END mssql_operator_howto_guide]