[top] / ZODB / interfaces / IStorageDB
Database interface exposed to storages
This interface provides 2 facilities:
A storage can notify it's database of object invalidations that don't occur due to direct operations on the storage. Currently this is only used by ZEO client storages to pass invalidation messages sent from a server.
The references method can be used to extract referenced object IDs from a database record. This can be used by storages to provide more advanced garbage collection.
This interface may be implemented by storage adapters or other intermediaries. For example, a storage adapter that provides encryption and/or compresssion will apply record transformations in it's references method.
There are no attributes or fields specified.
invalidate(transaction_id, oids, version='')
Invalidate object ids committed by the given transaction
The oids argument is an iterable of object identifiers.
invalidateCache()
Discard all cached data
This can be necessary if there have been major changes to stored data and it is either impractical to enumerate them or there would be so many that it would be inefficient to do so.
references(record, oids=None)
Scan the given record for object ids
A list of object ids is returned. If a list is passed in, then it will be used and augmented. Otherwise, a new list will be created and returned.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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ZODB.DB.DB