78 lines
3.1 KiB
Python
78 lines
3.1 KiB
Python
#
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from migrate import ForeignKeyConstraint
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from sqlalchemy import MetaData, Table
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from sqlalchemy.sql.expression import select
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TABLES = ['resource', 'sourceassoc', 'user',
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'project', 'meter', 'source', 'alarm']
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INDEXES = {
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"resource": (('user_id', 'user', 'id'),
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('project_id', 'project', 'id')),
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"sourceassoc": (('user_id', 'user', 'id'),
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('project_id', 'project', 'id'),
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('resource_id', 'resource', 'id'),
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('meter_id', 'meter', 'id'),
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('source_id', 'source', 'id')),
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"alarm": (('user_id', 'user', 'id'),
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('project_id', 'project', 'id')),
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"meter": (('user_id', 'user', 'id'),
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('project_id', 'project', 'id'),
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('resource_id', 'resource', 'id'),)
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}
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def upgrade(migrate_engine):
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if migrate_engine.name == 'sqlite':
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return
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meta = MetaData(bind=migrate_engine)
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load_tables = dict((table_name, Table(table_name, meta, autoload=True))
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for table_name in TABLES)
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for table_name, indexes in INDEXES.items():
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table = load_tables[table_name]
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for column, ref_table_name, ref_column_name in indexes:
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ref_table = load_tables[ref_table_name]
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subq = select([getattr(ref_table.c, ref_column_name)])
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sql_del = table.delete().where(
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~ getattr(table.c, column).in_(subq))
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migrate_engine.execute(sql_del)
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params = {'columns': [table.c[column]],
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'refcolumns': [ref_table.c[ref_column_name]]}
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if migrate_engine.name == 'mysql':
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params['name'] = "_".join(('fk', table_name, column))
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fkey = ForeignKeyConstraint(**params)
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fkey.create()
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def downgrade(migrate_engine):
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if migrate_engine.name == 'sqlite':
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return
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meta = MetaData(bind=migrate_engine)
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load_tables = dict((table_name, Table(table_name, meta, autoload=True))
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for table_name in TABLES)
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for table_name, indexes in INDEXES.items():
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table = load_tables[table_name]
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for column, ref_table_name, ref_column_name in indexes:
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ref_table = load_tables[ref_table_name]
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params = {'columns': [table.c[column]],
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'refcolumns': [ref_table.c[ref_column_name]]}
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if migrate_engine.name == 'mysql':
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params['name'] = "_".join(('fk', table_name, column))
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with migrate_engine.begin():
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fkey = ForeignKeyConstraint(**params)
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fkey.drop()
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