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from __future__ import annotations
import datetime
import os
from airflow import DAG
from airflow.providers.postgres.operators.postgres import PostgresOperator
# [START postgres_operator_howto_guide]
# create_pet_table, populate_pet_table, get_all_pets, and get_birth_date are examples of tasks created by
# instantiating the Postgres Operator
[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]DAG_ID = "postgres_operator_dag"
with DAG(
dag_id=DAG_ID,
start_date=datetime.datetime(2020, 2, 2),
schedule="@once",
catchup=False,
) as dag:
# [START postgres_operator_howto_guide_create_pet_table]
[docs] create_pet_table = PostgresOperator(
task_id="create_pet_table",
sql="""
CREATE TABLE IF NOT EXISTS pet (
pet_id SERIAL PRIMARY KEY,
name VARCHAR NOT NULL,
pet_type VARCHAR NOT NULL,
birth_date DATE NOT NULL,
OWNER VARCHAR NOT NULL);
""",
)
# [END postgres_operator_howto_guide_create_pet_table]
# [START postgres_operator_howto_guide_populate_pet_table]
populate_pet_table = PostgresOperator(
task_id="populate_pet_table",
sql="""
INSERT INTO pet (name, pet_type, birth_date, OWNER)
VALUES ( 'Max', 'Dog', '2018-07-05', 'Jane');
INSERT INTO pet (name, pet_type, birth_date, OWNER)
VALUES ( 'Susie', 'Cat', '2019-05-01', 'Phil');
INSERT INTO pet (name, pet_type, birth_date, OWNER)
VALUES ( 'Lester', 'Hamster', '2020-06-23', 'Lily');
INSERT INTO pet (name, pet_type, birth_date, OWNER)
VALUES ( 'Quincy', 'Parrot', '2013-08-11', 'Anne');
""",
)
# [END postgres_operator_howto_guide_populate_pet_table]
# [START postgres_operator_howto_guide_get_all_pets]
get_all_pets = PostgresOperator(task_id="get_all_pets", sql="SELECT * FROM pet;")
# [END postgres_operator_howto_guide_get_all_pets]
# [START postgres_operator_howto_guide_get_birth_date]
get_birth_date = PostgresOperator(
task_id="get_birth_date",
sql="SELECT * FROM pet WHERE birth_date BETWEEN SYMMETRIC %(begin_date)s AND %(end_date)s",
parameters={"begin_date": "2020-01-01", "end_date": "2020-12-31"},
hook_params={"options": "-c statement_timeout=3000ms"},
)
# [END postgres_operator_howto_guide_get_birth_date]
create_pet_table >> populate_pet_table >> get_all_pets >> get_birth_date
# [END postgres_operator_howto_guide]
from tests.system.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.system.utils 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)