124 lines
5.1 KiB
Python
124 lines
5.1 KiB
Python
# 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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import sqlalchemy
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from sqlalchemy import Table, Index, UniqueConstraint, Sequence
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from sqlalchemy.schema import (AddConstraint, DropConstraint, CreateIndex,
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ForeignKeyConstraint)
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from sqlalchemy import sql
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from sqlalchemy import update
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def upgrade(migrate_engine):
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meta = sqlalchemy.MetaData()
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meta.bind = migrate_engine
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if migrate_engine.name not in ['mysql', 'postgresql']:
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return
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image_properties = Table('image_properties', meta, autoload=True)
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image_members = Table('image_members', meta, autoload=True)
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images = Table('images', meta, autoload=True)
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# We have to ensure that we doesn't have `nulls` values since we are going
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# to set nullable=False
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migrate_engine.execute(
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update(image_members)
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.where(image_members.c.status == sql.expression.null())
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.values(status='pending'))
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migrate_engine.execute(
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update(images)
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.where(images.c.protected == sql.expression.null())
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.values(protected=sql.expression.false()))
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image_members.c.status.alter(nullable=False, server_default='pending')
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images.c.protected.alter(
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nullable=False, server_default=sql.expression.false())
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if migrate_engine.name == 'postgresql':
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Index('ix_image_properties_image_id_name',
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image_properties.c.image_id,
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image_properties.c.name).drop()
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# We have different names of this constraint in different versions of
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# postgresql. Since we have only one constraint on this table, we can
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# get it in the following way.
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name = migrate_engine.execute(
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"""SELECT conname
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FROM pg_constraint
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WHERE conrelid =
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(SELECT oid
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FROM pg_class
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WHERE relname LIKE 'image_properties')
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AND contype = 'u';""").scalar()
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name,
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name='%s' % name)
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migrate_engine.execute(DropConstraint(constraint))
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name,
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name='ix_image_properties_image_id_name')
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migrate_engine.execute(AddConstraint(constraint))
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images.c.id.alter(server_default=None)
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if migrate_engine.name == 'mysql':
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name,
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name='image_id')
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migrate_engine.execute(DropConstraint(constraint))
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image_locations = Table('image_locations', meta, autoload=True)
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if len(image_locations.foreign_keys) == 0:
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migrate_engine.execute(AddConstraint(ForeignKeyConstraint(
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[image_locations.c.image_id], [images.c.id])))
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def downgrade(migrate_engine):
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meta = sqlalchemy.MetaData()
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meta.bind = migrate_engine
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if migrate_engine.name not in ['mysql', 'postgresql']:
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return
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image_properties = Table('image_properties', meta, autoload=True)
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image_members = Table('image_members', meta, autoload=True)
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images = Table('images', meta, autoload=True)
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if migrate_engine.name == 'postgresql':
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name,
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name='ix_image_properties_image_id_name')
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migrate_engine.execute(DropConstraint(constraint))
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name)
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migrate_engine.execute(AddConstraint(constraint))
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index = Index('ix_image_properties_image_id_name',
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image_properties.c.image_id,
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image_properties.c.name)
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migrate_engine.execute(CreateIndex(index))
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images.c.id.alter(server_default=Sequence('images_id_seq')
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.next_value())
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if migrate_engine.name == 'mysql':
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constraint = UniqueConstraint(image_properties.c.image_id,
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image_properties.c.name,
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name='image_id')
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migrate_engine.execute(AddConstraint(constraint))
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image_members.c.status.alter(nullable=True, server_default=None)
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images.c.protected.alter(nullable=True, server_default=None)
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