Migrating Relational Model to Object-Relational Model

Hi,
Can someone direct me to appropriate tutorial/examples in migrating spatial relational model to object-relatonal model.
I have the following tables in the relational model:
ROADS
ROADS_SDODIM
ROADS_SDOGEOM
ROADS_SDOINDEX
ROADS_SDOLAYER
What tables would I need to create in the object-relational model?
Can someone advice me on how to use this function sdo_migrate.to_current?
Thanks in advance!

There are a number of Object Oriented databases out there, with Gemstone perhaps the best known. Also, Oracle, and other RDBMS vendors are adding more object oriented features all the time.
However, there are some downsides to OO databases. One of the biggest is that it is often really difficult to query the data directly. All interaction with the database needs some sort of mapping layer to instantiate the objects and get their attributes. It is also difficult, and sometimes impossible, to generate ad hoc queries that try to look at the data in a way that does not match the object model, something that is relatively easy in a well designed relational model.
Finally, object oriented databases represent a more or less one to one mapping to a currently popular programming paradigm. What happens to the data when the next great programming paradigm (foo perspective) comes along? Will the foo prgrammer be able to easily read the objects in the OO database? Probably not. Will the foo programmer be able to easily read the relational data? Almost certainly.
John

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