Object-relation mapping system supporting model extension in runtime, and method thereof

The invention relates to an object-relation mapping system supporting model extension in runtime, and a method thereof. The system comprises a relational-data storage subsystem used for accessing objects in a relational-data format, a tuple storage subsystem used for accessing the objects in a multi-tuple format, and an allocator/assembler used for accessing the original parts and extension partsof the objects to the relational-data storage subsystem and the tuple storage subsystem respectively according to the model information of the objects. Therefore, the object-relation mapping system can support model extension in the runtime without shutting down the system during update or modifying mode and migrating data in a relational database.