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Rose::DB::Object is a base class for objects that encapsulate a
single row in a database table. It provides the following functions:
* Create a row in the database by saving a newly constructed object.
* Initialize an object by loading a row from the database.
* Update a row by saving a modified object back to the database.
* Delete a row from the database.
* Fetch an object referred to by a foreign key in the current object.
(i.e., "one to one" and "many to one" relationships.)
* Fetch multiple objects that refer to the current object, either directly
through foreign keys or indirectly through a mapping table. (i.e., "one
to many" and "many to many" relationships.)
* Load an object along with "foreign objects" that are related through any
of the supported relationship types.
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