Manual:IDBAccessObject.php
| MediaWiki file: IDBAccessObject.php | |
|---|---|
| Location: | includes/libs/rdbms/ |
| Source code: | master • 1.42.3 • 1.41.4 • 1.39.10 |
| Classes: | IDBAccessObject |
Interface for database access objects.
Classes using this support a set of constants in a bitfield argument to their data loading functions. In general, objects should assume READ_NORMAL if no flags are explicitly given, though certain objects may assume READ_LATEST for common use case or legacy reasons.
There are four types of reads:
- READ_NORMAL : Potentially cached read of data (e.g. from a replica DB or stale replica)
- READ_LATEST : Up-to-date read as of transaction start (e.g. from primary or a quorum read)
- READ_LOCKING : Up-to-date read as of now, that locks (shared) the records
- READ_EXCLUSIVE : Up-to-date read as of now, that locks (exclusive) the records
All record locks persist for the duration of the transaction.
Extended by
[edit]Implemented by
[edit]Public methods
[edit]None.