55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
#
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# Copyright 2013 Rackspace Hosting
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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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import sqlalchemy as sa
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from ceilometer.storage.sqlalchemy import migration
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from ceilometer.storage.sqlalchemy import models
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_col = 'timestamp'
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def _convert_data_type(table, col, from_t, to_t, pk_attr='id', index=False):
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temp_col_n = 'convert_data_type_temp_col'
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# Override column we're going to convert with from_t, since the type we're
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# replacing could be custom and we need to tell SQLALchemy how to perform
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# CRUD operations with it.
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table = sa.Table(table.name, table.metadata, sa.Column(col, from_t),
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extend_existing=True)
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sa.Column(temp_col_n, to_t).create(table)
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key_attr = getattr(table.c, pk_attr)
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orig_col = getattr(table.c, col)
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new_col = getattr(table.c, temp_col_n)
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query = sa.select([key_attr, orig_col])
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for key, value in migration.paged(query):
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(table.update().where(key_attr == key).values({temp_col_n: value}).
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execute())
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orig_col.drop()
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new_col.alter(name=col)
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if index:
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sa.Index('ix_%s_%s' % (table.name, col), new_col).create()
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def upgrade(migrate_engine):
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if migrate_engine.name == 'mysql':
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meta = sa.MetaData(bind=migrate_engine)
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meter = sa.Table('meter', meta, autoload=True)
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_convert_data_type(meter, _col, sa.DateTime(),
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models.PreciseTimestamp(),
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pk_attr='id', index=True)
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