Abstract: A procedure for translating tuples received from a relational database management system (RDBMS) to object-oriented objects is described. The procedure operates by instantiating one or more application objects, and then setting base attributes of the application objects using information in the tuples. One or more intermediate objects are created using information in the tuples to represent those application objects having relationship attributes requiring dereferencing. Relationship attributes in the application objects are then set by swizzling the intermediate objects (rather than by swizzling the application objects themselves).

Abstract: An object-relational database gateway for use in a computing environment having a relational database management system (RDBMS) is disclosed. Object-oriented objects in the computing environment conform to a class inheritance hierarchy defined by an object-oriented schema. The gateway includes a query generator to generate from an object-oriented query a set of relational queries. The object-oriented query identifies one or more target objects of a target class which are desired to be constructed. The set of relational queries, when processed, enable the RDBMS to retrieve tuples required to initialize base attributes of the target objects that are defined by the target class and by any super-classes and sub-classes of the target class. The gateway also includes a tuple-to-object translator to translate the tuples to object-oriented objects consistent with the class inheritance hierarchy.

Abstract: An object-relational database gateway for use in a computing environment having a relational database management system (RDBMS) is disclosed. Object-oriented objects in the computing environment conform to a class inheritance hierarchy defined by an object-oriented schema. The gateway includes a query generator to generate from an object-oriented query a set of relational queries. The object-oriented query identifies one or more target objects of a target class which are desired to be constructed. The set of relational queries, when processed, enable the RDBMS to retrieve tuples required to initialize base attributes of the target objects that are defined by the target class and by any super-classes and sub-classes of the target class. The gateway also includes a tuple-to-object translator to translate the tuples to object-oriented objects consistent with the class inheritance hierarchy.