When persisting objects, the objects require an "identity", so as to uniquely identify them for storage and retrieval. This in-memory id is normally mapped directly to a primary key column or columns in the database. Every object in Telerik Data Access has a unique identifier, i.e. a "primary key" from the database point of view. The identifier has to be defined when the object is made persistent (except when a key generator mechanism is used). Using this identifier, you can directly retrieve an object from the database.
This section provides examples of how to define identities in Fluent Mapping models: