OpenStack Study: 002_add_mapping_tables.py

**** CubicPower OpenStack Study ****

def upgrade(migrate_engine):

    meta = sql.MetaData()

    meta.bind = migrate_engine

    mapping_table = sql.Table(

        'mapping',

        meta,

        sql.Column('id', sql.String(64), primary_key=True),

        sql.Column('rules', sql.Text(), nullable=False))

    mapping_table.create(migrate_engine, checkfirst=True)

**** CubicPower OpenStack Study ****

def downgrade(migrate_engine):

    meta = sql.MetaData()

    meta.bind = migrate_engine

    # Drop previously created tables

    tables = ['mapping']

    for table_name in tables:

        table = sql.Table(table_name, meta, autoload=True)

        table.drop()