text: # 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.
  #
  
  """L3 extension distributed mode
  
  Revision ID: 3927f7f7c456
  Revises: db_healing
  Create Date: 2014-04-02 23:26:19.303633
  """
  
  # revision identifiers, used by Alembic.
  revision = '3927f7f7c456'
  down_revision = 'db_healing'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      context = op.get_context()
      op.create_table(
          'router_extra_attributes',
          sa.Column('router_id', sa.String(length=36), nullable=False),
          sa.Column('distributed', sa.Boolean(), nullable=False,
                    server_default=sa.sql.false()),
          sa.ForeignKeyConstraint(
              ['router_id'], ['routers.id'], ondelete='CASCADE'),
          sa.PrimaryKeyConstraint('router_id')
      )
      if context.bind.dialect.name == 'ibm_db_sa':
          # NOTE(mriedem): DB2 stores booleans as 0 and 1.
          op.execute("INSERT INTO router_extra_attributes "
                "SELECT id as router_id, "
                "0 as distributed from routers")
      else:
          op.execute("INSERT INTO router_extra_attributes "
                "SELECT id as router_id, "
                "False as distributed from routers")
  