EOAdaptorChannel.Concepts

Creating an EOAdaptorChannel Subclass

EOAdaptorChannel provides many default method implementations that are sufficient for concrete subclasses:

• adaptorContext
• delegate
• deleteRowDescribedByQualifier
• lockRowComparingAttributes
• performAdaptorOperation
• performAdaptorOperations
• updateValuesInRowDescribedByQualifier

The following methods establish structure and conventions that other Enterprise Objects Framework classes depend on and should be overridden with caution:

• setDelegate

If you override any of the above methods, your implementations should incorporate the superclass's implementation through a message to super.

The remaining EOAdaptorChannel methods must be overridden by concrete subclasses in terms of the persistent storage system with which it interacts:

• attributesToFetch
• cancelFetch
• closeChannel
• deleteRowsDescribedByQualifier
• describeModelWithTableNames
• describeResults
• describeStoredProcedureNames
• describeTableNames
• evaluateExpression
• executeStoredProcedure
• fetchRow
• insertRow
• isFetchInProgress
• isOpen
• openChannel
• primaryKeyForNewRowWithEntity
• returnValuesForLastStoredProcedureInvocation
• selectAttributes
• setAttributesToFetch
• updateValuesInRowsDescribedByQualifier

© 2001 Apple Computer, Inc. (Last Published April 13, 2001)