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"""
Example Airflow DAG to show usage of TeradataOperator.
This DAG assumes Airflow Connection with connection id `teradata_default` already exists in locally. It
shows how to use create, update, delete and select teradata statements with TeradataOperator as tasks in
airflow dags using TeradataStoredProcedureOperator.
"""
from __future__ import annotations
import datetime
import os
import pytest
from airflow import DAG
try:
from airflow.providers.teradata.operators.teradata import TeradataOperator
except ImportError:
pytest.skip("TERADATA provider not available", allow_module_level=True)
# [START teradata_operator_howto_guide]
[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]DAG_ID = "example_teradata"
[docs]CONN_ID = "teradata_default"
with DAG(
dag_id=DAG_ID,
start_date=datetime.datetime(2020, 2, 2),
schedule="@once",
catchup=False,
default_args={"teradata_conn_id": CONN_ID},
) as dag:
# [START teradata_operator_howto_guide_create_table]
[docs] create_table = TeradataOperator(
task_id="create_table",
sql=r"""
CREATE TABLE Country (
country_id INTEGER,
name CHAR(25),
continent CHAR(25)
);
""",
)
# [END teradata_operator_howto_guide_create_table]
# [START teradata_operator_howto_guide_create_table_from_external_file]
create_table_from_external_file = TeradataOperator(
task_id="create_table_from_external_file",
sql="create_table.sql",
dag=dag,
)
# [END teradata_operator_howto_guide_create_table_from_external_file]
# [START teradata_operator_howto_guide_populate_table]
populate_table = TeradataOperator(
task_id="populate_table",
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 teradata_operator_howto_guide_populate_table]
# [START teradata_operator_howto_guide_get_all_countries]
get_all_countries = TeradataOperator(
task_id="get_all_countries",
sql=r"SELECT * FROM Country;",
)
# [END teradata_operator_howto_guide_get_all_countries]
# [START teradata_operator_howto_guide_params_passing_get_query]
get_countries_from_continent = TeradataOperator(
task_id="get_countries_from_continent",
sql=r"SELECT * FROM Country WHERE {{ params.column }}='{{ params.value }}';",
params={"column": "continent", "value": "Asia"},
)
# [END teradata_operator_howto_guide_params_passing_get_query]
# [START teradata_operator_howto_guide_drop_country_table]
drop_country_table = TeradataOperator(
task_id="drop_country_table",
sql=r"DROP TABLE Country;",
dag=dag,
)
# [END teradata_operator_howto_guide_drop_country_table]
# [START teradata_operator_howto_guide_drop_users_table]
drop_users_table = TeradataOperator(
task_id="drop_users_table",
sql=r"DROP TABLE Users;",
dag=dag,
)
# [END teradata_operator_howto_guide_drop_users_table]
# [START teradata_operator_howto_guide_create_schema]
create_schema = TeradataOperator(
task_id="create_schema",
sql=r"CREATE DATABASE airflow_temp AS PERM=10e6;",
)
# [END teradata_operator_howto_guide_create_schema]
# [START teradata_operator_howto_guide_create_table_with_schema]
create_table_with_schema = TeradataOperator(
task_id="create_table_with_schema",
sql=r"""
CREATE TABLE schema_table (
country_id INTEGER,
name CHAR(25),
continent CHAR(25)
);
""",
schema="airflow_temp",
)
# [END teradata_operator_howto_guide_create_table_with_schema]
# [START teradata_operator_howto_guide_drop_schema_table]
drop_schema_table = TeradataOperator(
task_id="drop_schema_table",
sql=r"DROP TABLE schema_table;",
dag=dag,
schema="airflow_temp",
)
# [END teradata_operator_howto_guide_drop_schema_table]
# [START teradata_operator_howto_guide_drop_schema]
drop_schema = TeradataOperator(
task_id="drop_schema",
sql=r"DROP DATABASE airflow_temp;",
dag=dag,
)
# [END teradata_operator_howto_guide_drop_schema]
(
create_table
>> create_table_from_external_file
>> populate_table
>> get_all_countries
>> get_countries_from_continent
>> drop_country_table
>> drop_users_table
>> create_schema
>> create_table_with_schema
>> drop_schema_table
>> drop_schema
)
# [END teradata_operator_howto_guide]
from tests_common.test_utils.watcher import watcher
# This test needs watcher in order to properly mark success/failure
# when "tearDown" task with trigger rule is part of the DAG
list(dag.tasks) >> watcher()
from tests_common.test_utils.system_tests import get_test_run # noqa: E402
# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)