airflow 0064_2_0_0_add_unique_constraint_to_conn_id 源码
airflow 0064_2_0_0_add_unique_constraint_to_conn_id 代码
文件路径：/airflow/migrations/versions/0064_2_0_0_add_unique_constraint_to_conn_id.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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#
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"""Add unique constraint to ``conn_id``
Revision ID: 8d48763f6d53
Revises: 8f966b9c467a
Create Date: 2020-05-03 16:55:01.834231
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
from airflow.models.base import COLLATION_ARGS
# revision identifiers, used by Alembic.
revision = '8d48763f6d53'
down_revision = '8f966b9c467a'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'
def upgrade():
"""Apply Add unique constraint to ``conn_id`` and set it as non-nullable"""
try:
with op.batch_alter_table('connection') as batch_op:
batch_op.alter_column("conn_id", nullable=False, existing_type=sa.String(250, **COLLATION_ARGS))
batch_op.create_unique_constraint(constraint_name="unique_conn_id", columns=["conn_id"])
except sa.exc.IntegrityError:
raise Exception("Make sure there are no duplicate connections with the same conn_id or null values")
def downgrade():
"""Unapply Add unique constraint to ``conn_id`` and set it as non-nullable"""
with op.batch_alter_table('connection') as batch_op:
batch_op.drop_constraint(constraint_name="unique_conn_id", type_="unique")
batch_op.alter_column("conn_id", nullable=True, existing_type=sa.String(250))
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