1. Object Relational and Extended Relational Database Systems
Chapter 13
Object Relational and
Extended Relational Database Systems

2. Evolution RDBMS: relational data model ODBMS: object data model
legacy DBMSs: hierarchical and network models
ORDBMS
enhance the capabilities of RDBMSs with some features in ODBMSs

3. classification of DBMS applications
simple data, simple querying
simple data, complex querying
traditional RDBMSs
complex data, simple querying
ODBMSs
complex data, complex querying
ORDBMSs

4. Informix Universal Server: an ORDBMS
how Informix Universal Server extends the relational data model
support for additional or extensible data types
support for user-defined routines (procedures or functions)
implicit notion of inheritance
support for indexing extensions
data blades application programming interface (API)

5. extensible data type Data Blade modules (built-in types)
2-D geometric objects (points, lines, circles, ellipses)
images
time series
text
web pages
constructs for additional types
Opaque type
Distinct type
Row type
Collection type

6. Opaque type
User has to provide casting functions to convert an opaque object between its hidden representation in the server (database) and its visible representation as seen by client (calling program)
send/receive converts to/from the server internal representation from/to the client representation
import/export converts to/from an external representation for bulk copy from/to the internal representation

7. An example
CREATE