What's pattern: Pattern is a particular solution, on that's both common and effective in dealing with one or more recurring problems. It's kind of reuse of good method dealing some problems. Patterns are "half baked", every time we use a pattern we tweak it a little here and a little there.

DataMapper:  Encapsulates the detail of the database, and then just return the domain object which you need.

Serialized LOB (Single large object): store an object in a database field, two ways: a binary (BLOB) or as textual characters(CLOB)

ORM-Inheritance: Concrete table inheritance; Single table inheritance; Class table inheritance;