EOKeyGlobalID

Inherits From:
NSObject

Conforms To: NSCoding
NSCopying (EOGlobalID)
NSObject (NSObject)

Declared in: EOAccess/EOKeyGlobalID.h

EOKeyGlobalID is a concrete subclass of EOGlobalID whose instances represent persistent IDs based on EOModel information: an entity and the primary key values for the object being identified. When creating an EOKeyGlobalID, the key values must be supplied following alphabetical order for their attribute names. EOKeyGlobalID defines the globalIDWithEntityName:keys:keyCount:zone: for creating instances, but it's much more convenient to create instances from fetched rows using EOEntity's globalIDForRow: method. (EOEntity and EOModel are defined in EOAccess.)

Adopted Protocols

NSCoding

- encodeWithCoder:

- initWithCoder:

Creating instances

+ globalIDWithEntityName:keys:keyCount:zone:

Getting the entity name

- entityName

Getting the key values

- keyValues

- keyCount

- keyValuesArray

Comparison

- isEqual:

globalIDWithEntityName:keys:keyCount:zone:

Returns an EOKeyGlobalID based on entityName and keyValues. For performance reasons, the key values are given as a C array of id ; count indicates how many key values there are. The object returned is allocated from zone.

EOKeyGlobalIDs are more conveniently created using EOEntity's globalIDForRow: method (EOAccess).

entityName

Returns the name of the entity governing the object identified by the receiver. This is used by EODatabaseContexts (EOAccess) to identify an EOEntity (EOAccess) in methods such as faultForGlobalID:editingContext: .

hash- (unsigned int)hash

Returns an integer that can be used as a table address in a hash table structure. If two objects are equal (as determined by isEqual: ), they must have the same hash value. For more information, see the descriptions of this method in the NSObject class and protocol specifications of the Foundation Framework.

isEqual:

- (BOOL)isEqual: (id)anObject

Returns YES if the receiver and anObject share the same entity name and key values, NO if they don't. For more information, see the descriptions of this method in the NSObject class and protocol specifications of the Foundation Framework.

See also: - entityName , - keyValues

keyCount

Returns the number of key values in the receiver.

keyValues

Returns the receiver's key values as a C array of id (for performance reasons).

keyValuesArray

Returns the receiver's key values as an NSArray.