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 and "FOR UPDATE"

        // 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)
}