airflow 0110_2_3_2_add_cascade_to_dag_tag_foreignkey 源码
airflow 0110_2_3_2_add_cascade_to_dag_tag_foreignkey 代码
文件路径:/airflow/migrations/versions/0110_2_3_2_add_cascade_to_dag_tag_foreignkey.py
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# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
# http://www.apache.org/licenses/LICENSE-2.0
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"""Add cascade to dag_tag foreign key
Revision ID: 3c94c427fdf6
Revises: 1de7bc13c950
Create Date: 2022-05-03 09:47:41.957710
"""
from __future__ import annotations
from alembic import op
from sqlalchemy import inspect
from airflow.migrations.utils import get_mssql_table_constraints
# revision identifiers, used by Alembic.
revision = '3c94c427fdf6'
down_revision = '1de7bc13c950'
branch_labels = None
depends_on = None
airflow_version = '2.3.2'
def upgrade():
"""Apply Add cascade to dag_tag foreignkey"""
conn = op.get_bind()
if conn.dialect.name in ['sqlite', 'mysql']:
inspector = inspect(conn.engine)
foreignkey = inspector.get_foreign_keys('dag_tag')
with op.batch_alter_table(
'dag_tag',
) as batch_op:
batch_op.drop_constraint(foreignkey[0]['name'], type_='foreignkey')
batch_op.create_foreign_key(
"dag_tag_dag_id_fkey", 'dag', ['dag_id'], ['dag_id'], ondelete='CASCADE'
)
else:
with op.batch_alter_table('dag_tag') as batch_op:
if conn.dialect.name == 'mssql':
constraints = get_mssql_table_constraints(conn, 'dag_tag')
Fk, _ = constraints['FOREIGN KEY'].popitem()
batch_op.drop_constraint(Fk, type_='foreignkey')
if conn.dialect.name == 'postgresql':
batch_op.drop_constraint('dag_tag_dag_id_fkey', type_='foreignkey')
batch_op.create_foreign_key(
"dag_tag_dag_id_fkey", 'dag', ['dag_id'], ['dag_id'], ondelete='CASCADE'
)
def downgrade():
"""Unapply Add cascade to dag_tag foreignkey"""
conn = op.get_bind()
if conn.dialect.name == 'sqlite':
with op.batch_alter_table('dag_tag') as batch_op:
batch_op.drop_constraint('dag_tag_dag_id_fkey', type_='foreignkey')
batch_op.create_foreign_key("fk_dag_tag_dag_id_dag", 'dag', ['dag_id'], ['dag_id'])
else:
with op.batch_alter_table('dag_tag') as batch_op:
batch_op.drop_constraint('dag_tag_dag_id_fkey', type_='foreignkey')
batch_op.create_foreign_key(
None,
'dag',
['dag_id'],
['dag_id'],
)
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