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«Introduction to Core Data Programming Guide 11 Who Should Read This Document 11 Organization of This Document 11 See Also 13 Technology Overview 14 ...»

-- [ Page 27 ] --

snapshot A record of the state of an entry fetched from a persistent store at the time is it fetched. The information in a snapshot is used to support the framework’s optimistic locking mechanism. In some persistent stores it is also used when changes are committed back to a data source to update only the attributes that were changed since the last fetch.

transient property A property of an entity that is not saved to a persistent data store, but which is recorded for undo and redo operations in memory.

uniquing Ensuring that an object graph does not have multiple objects representing the same entry in a persistent store. Core Data accomplishes uniquing by using the information it maintains in the mapping of each managed object to its corresponding entry in a persistent store.

validation The process of ensuring that a property value is valid—for example, that it is of the correct type, and its value lies within a prescribed range.

The Core Data framework provides an infrastructure to allow values to be tested for validity before they can be applied to an object. There are three aspects to validation: model-based validation, attribute validation using custom validation methods, inter-attribute validation (consistency checking) for update, insert, and delete.

2012-09-19 | Copyright © 2004, 2012 Apple Inc. All Rights Reserved.

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