1
# Copyright Tesora, Inc. 2014
3
# Licensed under the Apache License, Version 2.0 (the "License"); you may
4
# not use this file except in compliance with the License. You may obtain
5
# a copy of the License at
7
# http://www.apache.org/licenses/LICENSE-2.0
9
# Unless required by applicable law or agreed to in writing, software
10
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12
# License for the specific language governing permissions and limitations
15
from sqlalchemy.schema import Column
16
from sqlalchemy.schema import MetaData
17
from sqlalchemy.schema import ForeignKey
19
from trove.db.sqlalchemy.migrate_repo.schema import String
20
from trove.db.sqlalchemy.migrate_repo.schema import Table
22
COLUMN_NAME = 'slave_of_id'
25
def upgrade(migrate_engine):
27
meta.bind = migrate_engine
28
instances = Table('instances', meta, autoload=True)
29
instances.create_column(
30
Column(COLUMN_NAME, String(36), ForeignKey('instances.id')),
34
def downgrade(migrate_engine):
36
meta.bind = migrate_engine
37
instances = Table('instances', meta, autoload=True)
38
instances.drop_column(COLUMN_NAME)