The Object Relational Gap (updated)

The Object	Relational Gap
transient	persistent
classes	tables
inheritance
attributes	columns
objects	rows
instance attribute implicity ID: reference	field explicit ID: primary key
relations	relations
references unidirectional  ordered (lists)	foreign keys bidirectional
behaviour centric	data centric
navigate to object behaviour based partitioning methods	operate on set relation based partitioning stored procedures
tight behaviour-data coupling	triggers, constraints
data hiding, encapsulation
	Permissions