OpenStack Study: 009_add_snapshot_metadata_table.py

**** CubicPower OpenStack Study ****

def upgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine

    snapshots = Table('snapshots', meta, autoload=True)

    # New table

    snapshot_metadata = Table(

        'snapshot_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('snapshot_id', String(length=36), ForeignKey('snapshots.id'),

               nullable=False),

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

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

        mysql_engine='InnoDB'

    )

    try:

        snapshot_metadata.create()

    except Exception:

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

        raise

**** CubicPower OpenStack Study ****

def downgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine

    snapshot_metadata = Table('snapshot_metadata',

                              meta,

                              autoload=True)

    try:

        snapshot_metadata.drop()

    except Exception:

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

        raise