51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# Copyright Tesora, Inc. 2014
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from sqlalchemy.schema import Column
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from sqlalchemy.schema import ForeignKey
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from sqlalchemy.schema import MetaData
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from trove.db.sqlalchemy.migrate_repo.schema import String
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from trove.db.sqlalchemy.migrate_repo.schema import Table
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from trove.db.sqlalchemy import utils as db_utils
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COLUMN_NAME = 'slave_of_id'
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def upgrade(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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instances = Table('instances', meta, autoload=True)
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instances.create_column(
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Column(COLUMN_NAME, String(36), ForeignKey('instances.id')),
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nullable=True)
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def downgrade(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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instances = Table('instances', meta, autoload=True)
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constraint_names = db_utils.get_foreign_key_constraint_names(
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engine=migrate_engine,
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table='instances',
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columns=[COLUMN_NAME],
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ref_table='instances',
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ref_columns=['id'])
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db_utils.drop_foreign_key_constraints(
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constraint_names=constraint_names,
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columns=[instances.c.slave_of_id],
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ref_columns=[instances.c.id])
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instances.drop_column(COLUMN_NAME)
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