airflow 0075_2_0_0_add_description_field_to_connection 源码
airflow 0075_2_0_0_add_description_field_to_connection 代码
文件路径：/airflow/migrations/versions/0075_2_0_0_add_description_field_to_connection.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# 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
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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# software distributed under the License is distributed on an
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"""Add description field to ``connection`` table
Revision ID: 61ec73d9401f
Revises: 2c6edca13270
Create Date: 2020-09-10 14:56:30.279248
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
# revision identifiers, used by Alembic.
revision = '61ec73d9401f'
down_revision = '2c6edca13270'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'
def upgrade():
"""Apply Add description field to ``connection`` table"""
conn = op.get_bind()
with op.batch_alter_table('connection') as batch_op:
if conn.dialect.name == "mysql":
# Handles case where on mysql with utf8mb4 this would exceed the size of row
# We have to set text type in this migration even if originally it was string
# This is permanently fixed in the follow-up migration 64a7d6477aae
batch_op.add_column(sa.Column('description', sa.Text(length=5000), nullable=True))
else:
batch_op.add_column(sa.Column('description', sa.String(length=5000), nullable=True))
def downgrade():
"""Unapply Add description field to ``connection`` table"""
with op.batch_alter_table('connection', schema=None) as batch_op:
batch_op.drop_column('description')
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