<
database> (OODB) A system offering
DBMS facilities in an
object-oriented programming environment. Data is stored as
objects and can be interpreted only using the
methods
specified by its
class. The relationship between similar
objects is preserved (
inheritance) as are references between
objects. Queries can be faster because
joins are often not
needed (as in a
relational database). This is because an
object can be retrieved directly without a search, by
following its
object id.
The same programming language can be used for both data
definition and data manipulation. The full power of the
database programming language's
type system can be used to
model
data structures and the relationship between the
different data items.
Multimedia applications are facilitated because the
class methods associated with the data are responsible for
its correct interpretation.
OODBs typically provide better support for
versioning. An
object can be viewed as the set of all its versions. Also,
object versions can be treated as full fledged objects. OODBs
also provide systematic support for
triggers and
constraints which are the basis of
active databases.
Most, if not all,
object-
oriented application programs that
have
database needs will benefit from using an OODB.
Ode is an example of an OODB built on
C++.
(1997-12-07)