71422d264c
Notes on migration changes/tests: 1. The initial havana migration does not create any foreign keys which require the instances.uuid column since it's nullable and DB2 won't allow creating a unique constraint over a nullable column. To create the foreign keys on instances.uuid, this change depends on commit e07a2b2d4be0503ad8dad75daa632be27cf83320 to make instances.uuid non-nullable and create a unique constraint on that column. Then the new migration here creates the missing instances.uuid related foreign keys for DB2. 2. Commit b930fb3a6b0ab8cbe0c19eb3ab8ba33d60d147be changed test_migrations.py to use oslo.db's opportunistic test fixture which currently only supports sqlite/mysql/postgresql. Unit test support for DB2 therefore needs to be added to oslo.db and then hooked into nova, but that's targeted for the 2016.1 'M' release so is not part of this change. 3. The 247_nullable_mismatch migration is updated for DB2 because making the pci_devices.deleted column nullable=True fails since the column is in a UniqueConstraint already (DB2 would require it to be in a unique index instead for the column to be nullable). There is a foreign key involved (created in 246) so for DB2 to have the same FKey it requires a UC and that requires the deleted column to be non-null, which doesn't work with the SoftDeleteMixin. So in this case the schema will diverge for DB2 until we make the deleted column non-nullable for all tables. 4. The 252_add_instance_extra_table migration is updated for DB2 because a foreign key is created between the instance_extra table and the instances.uuid column (which is nullable at the time) so we have to handle that foreign key constraint creation in the 296 migration with the other foreign keys to instances.uuid. 5. The 271 migration is updated to add ibm_db_sa the same as sqlite and postgresql since it works the same in this case for DB2. 6. The API migrations need checks for DB2 to avoid a duplicate index SQL0605W error since DB2 implicitly creates an Index when a UniqueConstraint is created and will fail if trying to add a duplicate index on the same column(s) that are in the UC. Implements blueprint db2-database Change-Id: Ic4224e2545bcdfeb236b071642f9f16d9ee3b99f |
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