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It was узнать больше здесь in Mac OS X The data can be manipulated using higher level objects representing entities and their relationships. Core Data manages the serialized version, providing object lifecycle and object graph management, Вами windows 7 build 7601 this copy of windows is not genuine free извиняюсь persistence.

Just as Cocoa Bindings handle many of the microsoft 2013 book free of the controller in a model—view—controller design, Core Data handles many of the duties of the data model. Among other tasks, it handles change management, serializing to disk, memory footprint minimization and queries against the data.

Core Data describes data with a high level data model expressed in filemaker pro 17 advanced user guide free of entities and their relationships plus fetch requests that retrieve entities meeting specific criteria. Code can retrieve and manipulate this data on a purely object level without having to worry about the details of storage and retrieval. The controller objects available in Interface Builder can retrieve and manipulate these entities directly.

When combined with Cocoa bindings the UI can display many components of the data model without needing background code. For example: a developer might be writing a program to handle vCards. In order to manage these, the author intends to read the vCards into objects, and then store them in a single larger XML file. Using Core Data the developer would drag their schema from the data designer in Xcode into an interface builder window to create a GUI for their schema. They could then write standard Objective-C or Swift code to read vCard filemaker pro 17 advanced user guide free and put the data into Core Data managed entities.

From that point on the author’s code manipulates these Core Data objects, rather than the underlying vCards. Connecting the Save menu item to the appropriate method in the controller object will direct the controller to examine the object stack, determine ссылка на подробности objects are dirtyand then re-write a Core Data document file with these changes.

Core Data is organized into a large hierarchy of classes, though interaction is only prevalent with a small set of them. Core Data schemas are standardized. If you have the Xcode Data Model file, you can read and write files in that format freely. Schema migration is also non-trivial, almost always requiring code.

If other developers have access to and depend upon your data model, you may need to provide version translation code in addition to a new data model if your schema changes.

EOF’s purpose was twofold: first, to connect to the database engine and hide the implementation details; second, to read the data out of the relational format and translate that into a set of objects. Developers typically interacted only with filemaker pro 17 advanced user guide free objects, which simplified development of complex programs, at the cost of some setup to map the data to the objects.

The EOF object model was deliberately designed to make the resulting programs work in a document-like fashion; the user could edit the data locally in memory, and then write out all changes with a single Save command. For instance, EOF required the ability to track which objects were dirty so the system could later write them out. This was presented to the developer not only as a document-like system, but also in the form of an unlimited Undo command stack, with each command applied to the data represented as an undoable action.

Initially, what was not translated was EOF itself. At the time, Apple was in the process of porting WebObjects to the Java programming language filemaker pro 17 advanced user guide free, and as part of this conversion, EOF became much more difficult to use from Cocoa.

Once again, there was considerable complaining among 3rd party developers. One critical realization is that the object state management system in EOF did not really have anything to do with relational databases. The same code could be, and was, used by developers to manage graphs of other objects as well.

In this role, the really useful parts of EOF were those that automatically built the object sets from the raw data, and then tracked them. It is this concept that forms the basis of Core Data. From Wikipedia, the free encyclopedia. Core Data Developer s Apple Inc. Stable release 3. Apple Inc. History Outline Timeline of products. Classic Mini Nano Shuffle Touch. Mini Air Pro Accessories. Card Pay Wallet. Arthur D. Andrea Jung Ronald D. Sugar Susan L. Woolard Jr. Jerry York.

Italics indicate discontinued products, servicesor defunct companies. History Architecture Components Server Software. Server 1. Hidden categories: Use mdy dates from October Namespaces Article Talk. Views Read Edit View history. Help Filemaker pro 17 advanced user guide free to edit Community portal Recent changes Upload file. Download as PDF Printable version. System Utility.

Financial Card Pay Wallet. Current Arthur D. Category Commons.