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"""
This is an example DAG for the use of the SQLExecuteQueryOperator with Oracle.
"""

from __future__ import annotations

import os
from datetime import datetime

from airflow import DAG
from airflow.providers.common.sql.operators.sql import SQLExecuteQueryOperator

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
DAG_ID = "example_oracle"

with DAG(
    dag_id=DAG_ID,
    schedule=None,
    start_date=datetime(2025, 1, 1),
    default_args={"conn_id": "oracle_conn_id"},
    tags=["example"],
    catchup=False,
) as dag:
    # [START howto_operator_oracle]

    # Example of creating a task that calls a common CREATE TABLE sql command.
    create_table_oracle_task = SQLExecuteQueryOperator(
        task_id="create_table_oracle",
        sql=r"""
            BEGIN
                EXECUTE IMMEDIATE '
                CREATE TABLE employees (
                    id NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
                    name VARCHAR2(50),
                    salary NUMBER(10, 2),
                    hire_date DATE DEFAULT SYSDATE
                )';
            END;
        """,
    )

    # [END howto_operator_oracle]

    insert_data_oracle_task = SQLExecuteQueryOperator(
        task_id="insert_data_oracle",
        sql=r"""
            BEGIN
                INSERT INTO employees (name, salary) VALUES ('Alice', 50000);
                INSERT INTO employees (name, salary) VALUES ('Bob', 60000);
            END;
        """,
    )

    select_data_oracle_task = SQLExecuteQueryOperator(
        task_id="select_data_oracle",
        sql=r"""
            SELECT * FROM employees
        """,
    )

    drop_table_oracle_task = SQLExecuteQueryOperator(
        task_id="drop_table_oracle",
        sql="DROP TABLE employees",
    )

    (create_table_oracle_task >> insert_data_oracle_task >> select_data_oracle_task >> drop_table_oracle_task)

    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: contributing-docs/testing/system_tests.rst)
test_run = get_test_run(dag)
