openstack/trove
Code Issues Proposed changes

Fixes migrations for MySQL 5.6.* and MariaDB 10.1.*

Browse Source 
In MySQL 5.6/MariaDB 10.1 and later versions there was a change
on the restrictions over foreign keys (FK).

In 019-datastore-fix.py, we attempt to change a column that is part
of a FK from NULL to not NULL. This sort of modifications are not
longer allowed.

This situation caused trove-manage db_sync and trove-manage db_migrate
to fail.

To workaround this, the FK check before executing the ALTER query
is disabled and then reenabled.

Change-Id: I666d01235f2c3225aca3fe7520ebdf6d53831cab
Closes-Bug: #1473226
This commit is contained in:
Victoria Martinez de la Cruz 2016-03-30 15:05:59 -03:00
parent d6d212fe45
commit 679e2283ec
2 changed files with 35 additions and 3 deletions
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23
trove/db/sqlalchemy/migrate_repo/versions/019_datastore_fix.py
View File

@ -20,6 +20,7 @@ from sqlalchemy.sql.expression import update
from trove.common import cfg
from trove.db.sqlalchemy.migrate_repo.schema import Table
from trove.db.sqlalchemy import utils as db_utils
CONF = cfg.CONF
LEGACY_IMAGE_ID = "00000000-0000-0000-0000-000000000000"
@ -89,6 +90,9 @@ def upgrade(migrate_engine):
meta.bind = migrate_engine
instance_table = Table('instances', meta, autoload=True)
datastore_versions_table = Table('datastore_versions',
meta,
autoload=True)
if has_instances_wo_datastore_version(instance_table):
instances = find_all_instances_wo_datastore_version(instance_table)
@ -97,9 +101,6 @@ def upgrade(migrate_engine):
datastores_table = Table('datastores',
meta,
autoload=True)
datastore_versions_table = Table('datastore_versions',
meta,
autoload=True)
version_id = create_legacy_version(datastores_table,
datastore_versions_table,
@ -111,8 +112,24 @@ def upgrade(migrate_engine):
values=dict(datastore_version_id=version_id)
).execute()
constraint_names = db_utils.get_foreign_key_constraint_names(
engine=migrate_engine,
table='instances',
columns=['datastore_version_id'],
ref_table='datastore_versions',
ref_columns=['id'])
db_utils.drop_foreign_key_constraints(
constraint_names=constraint_names,
columns=[instance_table.c.datastore_version_id],
ref_columns=[datastore_versions_table.c.id])
instance_table.c.datastore_version_id.alter(nullable=False)
db_utils.create_foreign_key_constraints(
constraint_names=constraint_names,
columns=[instance_table.c.datastore_version_id],
ref_columns=[datastore_versions_table.c.id])
def downgrade(migrate_engine):
meta.bind = migrate_engine

15
trove/db/sqlalchemy/utils.py
View File

@ -52,3 +52,18 @@ def drop_foreign_key_constraints(constraint_names, columns,
refcolumns=ref_columns,
name=constraint_name)
fkey_constraint.drop()
def create_foreign_key_constraints(constraint_names, columns,
ref_columns):
"""Create the foreign key constraints that match the given
criteria.
:param constraint_names: List of foreign key constraint names
:param columns: List of the foreign key columns.
:param ref_columns: List of the referenced columns.
"""
for constraint_name in constraint_names:
fkey_constraint = ForeignKeyConstraint(columns=columns,
refcolumns=ref_columns,
name=constraint_name)
fkey_constraint.create()