OpenStack Study: 020_add_volume_admin_metadata_table.py

**** CubicPower OpenStack Study ****

def upgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine

    _volumes = Table('volumes', meta, autoload=True)

    # New table

    volume_admin_metadata = Table(

        'volume_admin_metadata', meta,

        Column('created_at', DateTime),

        Column('updated_at', DateTime),

        Column('deleted_at', DateTime),

        Column('deleted', Boolean),

        Column('id', Integer, primary_key=True, nullable=False),

        Column('volume_id', String(length=36), ForeignKey('volumes.id'),

               nullable=False),

        Column('key', String(length=255)),

        Column('value', String(length=255)),

        mysql_engine='InnoDB',

        mysql_charset='utf8'

    )

    try:

        volume_admin_metadata.create()

    except Exception:

        LOG.error(_("Table |%s| not created!"), repr(volume_admin_metadata))

        raise

**** CubicPower OpenStack Study ****

def downgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine

    volume_admin_metadata = Table('volume_admin_metadata',

                                  meta,

                                  autoload=True)

    try:

        volume_admin_metadata.drop()

    except Exception:

        LOG.error(_("volume_admin_metadata table not dropped"))

        raise