What does an ORM solution comprises of?
• It should have an API for performing basic CRUD (Create, Read, Update, Delete) operations on objects of persistent classes
• Should have a language or an API for specifying queries that refer to the classes and the properties of classes
• An ability for specifying mapping metadata
• It should have a technique for ORM implementation to interact with transactional objects to perform dirty checking, lazy association fetching, and other optimization