/usr/share/pyshared/glance/registry/db/migrate_repo/schema.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# 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.
"""
Various conveniences used for migration scripts
"""
import logging
import sqlalchemy.types
logger = logging.getLogger('glance.registry.db.migrate_repo.schema')
String = lambda length: sqlalchemy.types.String(
length=length, convert_unicode=False, assert_unicode=None,
unicode_error=None, _warn_on_bytestring=False)
Text = lambda: sqlalchemy.types.Text(
length=None, convert_unicode=False, assert_unicode=None,
unicode_error=None, _warn_on_bytestring=False)
Boolean = lambda: sqlalchemy.types.Boolean(create_constraint=True, name=None)
DateTime = lambda: sqlalchemy.types.DateTime(timezone=False)
Integer = lambda: sqlalchemy.types.Integer()
BigInteger = lambda: sqlalchemy.types.BigInteger()
def from_migration_import(module_name, fromlist):
"""
Import a migration file and return the module
:param module_name: name of migration module to import from
(ex: 001_add_images_table)
:param fromlist: list of items to import (ex: define_images_table)
:retval: module object
This bit of ugliness warrants an explanation:
As you're writing migrations, you'll frequently want to refer to
tables defined in previous migrations.
In the interest of not repeating yourself, you need a way of importing
that table into a 'future' migration.
However, tables are bound to metadata, so what you need to import is
really a table factory, which you can late-bind to your current
metadata object.
Moreover, migrations begin with a number (001...), which means they
aren't valid Python identifiers. This means we can't perform a
'normal' import on them (the Python lexer will 'splode). Instead, we
need to use __import__ magic to bring the table-factory into our
namespace.
Example Usage:
(define_images_table,) = from_migration_import(
'001_add_images_table', ['define_images_table'])
images = define_images_table(meta)
# Refer to images table
"""
module_path = 'glance.registry.db.migrate_repo.versions.%s' % module_name
module = __import__(module_path, globals(), locals(), fromlist, -1)
return [getattr(module, item) for item in fromlist]
def create_tables(tables):
for table in tables:
logger.info(_("creating table %(table)s") % locals())
table.create()
def drop_tables(tables):
for table in tables:
logger.info(_("dropping table %(table)s") % locals())
table.drop()
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