[top] / ZODB / interfaces / IDatabase
ZODB DB.
TODO: This interface is incomplete.
databases
(Attribute)
A mapping from database name to DB (database) object.
In multi-database use, all DB members of a database collection share the same .databases object.
In single-database use, of course this mapping contains a single entry.
* = required
invalidate(transaction_id, oids, version='')
Invalidate object ids committed by the given transaction
The oids argument is an iterable of object identifiers.
undo(id, txn=None)
Undo a transaction identified by id.
A transaction can be undone if all of the objects involved in the transaction were not modified subsequently, if any modifications can be resolved by conflict resolution, or if subsequent changes resulted in the same object state.
The value of id should be generated by calling undoLog() or undoInfo(). The value of id is not the same as a transaction id used by other methods; it is unique to undo().
id: a storage-specific transaction identifier txn: transaction context to use for undo(). By default, uses the current transaction.
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.
close()
Close the database and its underlying storage.
It is important to close the database, because the storage may flush in-memory data structures to disk when it is closed. Leaving the storage open with the process exits can cause the next open to be slow.
What effect does closing the database have on existing connections? Technically, they remain open, but their storage is closed, so they stop behaving usefully. Perhaps close() should also close all the Connections.
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.
open(version='', transaction_manager=None)
Return an IConnection object for use by application code.
version: the "version" that all changes will be made in, defaults to no version. transaction_manager: transaction manager to use. None means use the default transaction manager.
Note that the connection pool is managed as a stack, to increase the likelihood that the connection's stack will include useful objects.
pack(t=None, days=0)
Pack the storage, deleting unused object revisions.
A pack is always performed relative to a particular time, by default the current time. All object revisions that are not reachable as of the pack time are deleted from the storage.
The cost of this operation varies by storage, but it is usually an expensive operation.
There are two optional arguments that can be used to set the pack time: t, pack time in seconds since the epcoh, and days, the number of days to subtract from t or from the current time if t is not specified.
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