IDBAccessObject.php

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<?php
interface IDBAccessObject {
    // Constants for object loading bitfield flags (higher => higher QoS)
    const READ_LATEST = 1; // read from the master
    const READ_LOCKING = 3; // READ_LATEST (1) and "LOCK IN SHARE MODE" (2)
    const READ_EXCLUSIVE = 7; // READ_LOCKING (3) and "FOR UPDATE" (4)

    // Convenience constant for callers to explicitly request slave data
    const READ_NORMAL = 0; // read from the slave

    // Convenience constant for tracking how data was loaded (higher => higher QoS)
    const READ_NONE = -1; // not loaded yet (or the object was cleared)
}