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# Copyright 2014 OpenStack Foundation
#
# Licensed 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
"""add constraint for routerid
Revision ID: 31d7f831a591
Revises: 37f322991f59
Create Date: 2014-02-26 06:47:16.494393
"""
# revision identifiers, used by Alembic.
revision = '31d7f831a591'
down_revision = '37f322991f59'
from alembic import op
import sqlalchemy as sa
from sqlalchemy.engine import reflection
TABLE_NAME = 'routerl3agentbindings'
PK_NAME = 'pk_routerl3agentbindings'
fk_names = {'postgresql':
{'router_id':
'routerl3agentbindings_router_id_fkey',
'l3_agent_id':
'routerl3agentbindings_l3_agent_id_fkey'},
'mysql':
{'router_id':
'routerl3agentbindings_ibfk_2',
'l3_agent_id':
'routerl3agentbindings_ibfk_1'}}
def upgrade():
# In order to sanitize the data during migration,
# the current records in the table need to be verified
# and all the duplicate records which violate the PK
# constraint need to be removed.
context = op.get_context()
if context.bind.dialect.name in ('postgresql', 'ibm_db_sa'):
op.execute('DELETE FROM %(table)s WHERE id in ('
'SELECT %(table)s.id FROM %(table)s LEFT OUTER JOIN '
'(SELECT MIN(id) as id, router_id, l3_agent_id '
' FROM %(table)s GROUP BY router_id, l3_agent_id) AS temp '
'ON %(table)s.id = temp.id WHERE temp.id is NULL);'
% {'table': TABLE_NAME})
else:
op.execute('DELETE %(table)s FROM %(table)s LEFT OUTER JOIN '
'(SELECT MIN(id) as id, router_id, l3_agent_id '
' FROM %(table)s GROUP BY router_id, l3_agent_id) AS temp '
'ON %(table)s.id = temp.id WHERE temp.id is NULL;'
% {'table': TABLE_NAME})
op.drop_column(TABLE_NAME, 'id')
# DB2 doesn't support nullable column in primary key
if context.bind.dialect.name == 'ibm_db_sa':
op.alter_column(
table_name=TABLE_NAME,
column_name='router_id',
nullable=False
)
op.alter_column(
table_name=TABLE_NAME,
column_name='l3_agent_id',
nullable=False
)
op.create_primary_key(
name=PK_NAME,
table_name=TABLE_NAME,
cols=['router_id', 'l3_agent_id']
)
def downgrade():
context = op.get_context()
dialect = context.bind.dialect.name
# Drop the existed foreign key constraints
# In order to perform primary key changes
db2fks = {}
if dialect == 'ibm_db_sa':
# NOTE(mriedem): In DB2 the foreign key names are randomly generated
# if you didn't originally explicitly name them, so the name is like
# SQLxxxxx where the suffix is a random integer. Therefore we go
# through and just drop all of the foreign keys and save them so we
# can re-create them later after the primary key is dropped.
inspector = reflection.Inspector.from_engine(op.get_bind().engine)
db2fks = inspector.get_foreign_keys(TABLE_NAME)
for fk in db2fks:
op.drop_constraint(
name=fk.get('name'),
table_name=TABLE_NAME,
type_='foreignkey'
)
else:
op.drop_constraint(
name=fk_names[dialect]['l3_agent_id'],
table_name=TABLE_NAME,
type_='foreignkey'
)
op.drop_constraint(
name=fk_names[dialect]['router_id'],
table_name=TABLE_NAME,
type_='foreignkey'
)
op.drop_constraint(
name=PK_NAME,
table_name=TABLE_NAME,
type_='primary'
)
op.add_column(
TABLE_NAME,
sa.Column('id', sa.String(32))
)
if dialect == 'ibm_db_sa':
# DB2 doesn't support nullable column in primary key
op.alter_column(
table_name=TABLE_NAME,
column_name='id',
nullable=False
)
op.create_primary_key(
name=PK_NAME,
table_name=TABLE_NAME,
cols=['id']
)
# Restore the foreign key constraints
if dialect == 'ibm_db_sa':
for fk in db2fks:
op.create_foreign_key(
name=fk.get('name'),
source=TABLE_NAME,
referent=fk.get('referred_table'),
local_cols=fk.get('constrained_columns'),
remote_cols=fk.get('referred_columns'),
ondelete='CASCADE'
)
else:
op.create_foreign_key(
name=fk_names[dialect]['router_id'],
source=TABLE_NAME,
referent='routers',
local_cols=['router_id'],
remote_cols=['id'],
ondelete='CASCADE'
)
op.create_foreign_key(
name=fk_names[dialect]['l3_agent_id'],
source=TABLE_NAME,
referent='agents',
local_cols=['l3_agent_id'],
remote_cols=['id'],
ondelete='CASCADE'
)
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