In ADO/OLE DB abstractions, a Recordset-style object offers which kinds of programmable features? Choose the set that best describes its interface surface.

Difficulty: Easy

Correct Answer: Properties, Collections, and Methods

Explanation:


Introduction / Context:
ADO (ActiveX Data Objects) presents data to developers through objects such as Connection, Command, and Recordset. These objects sit atop OLE DB providers and expose consistent, object-oriented interfaces to query and navigate tabular data.



Given Data / Assumptions:

  • We are considering the capabilities commonly exposed by ADO's Recordset abstraction.
  • Developers need to query metadata, iterate rows, and perform operations like AddNew, Update, and MoveNext.


Concept / Approach:
ADO objects are designed around three pillars: Properties (for configuration/state), Methods (to perform actions), and Collections (to enumerate related objects such as Fields). This trio provides a complete interaction surface without tying code to any specific DBMS.



Step-by-Step Solution:

Identify what Recordset exposes: Properties (CursorType, LockType), Collections (Fields), Methods (Open, Close, MoveNext, AddNew).Map these to ADO usage patterns: read metadata via Properties; iterate via Collections; act via Methods.Conclude the correct feature set is Properties, Collections, and Methods.


Verification / Alternative check:
Reference any ADO Recordset documentation: its object model explicitly lists properties, methods, and collections (for example, Fields collection).



Why Other Options Are Wrong:

  • Only one category (a, b, or c) is incomplete and does not reflect the full object model.
  • Events only: Although some ADO components may fire events, Recordset functionality is not “events only.”


Common Pitfalls:
Assuming ADO Recordset equals a simple array. It is a rich COM object with navigational and update semantics, not just a passive container.



Final Answer:
Properties, Collections, and Methods

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