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

• Manual:PageLookup.php
• Manual:UserIdentityLookup.php
• Manual:RevisionLookup.php

Implemented by

• DBAccessObjectUtils

Public methods

None.