System and method for object persistence

• US 20060136464A1
• Filed: 12/17/2004
• Published: 06/22/2006
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP AG (SAP SE)
• Inventors: Rossmann, Albert P.
• Granted Patent: US 7,739,290 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/289 Object oriented databases

Abstract

Embodiments of the invention are generally directed to a system and method for object persistence. In an embodiment, a proxy object is created based, at least in part, on object metadata stored in an internal data store of a persistence manager. The persistence manager may receive a request to access member data of a persistent object associated with the proxy object. In one embodiment, the persistence manager provides the member data from the proxy object.

Claims

1. A computer-implemented method for object persistence comprising:

generating a proxy class based on metadata stored in a relational database;

receiving a request to access member data of a persistent object associated with the proxy class; and

providing the member data from a proxy object.

2. The method of claim 1, wherein generating the proxy class based on the metadata stored in the relational database comprises:

accessing a database result set to obtain the object member data; and

creating the proxy object based, at least in part, on the metadata stored in the relational database.

3. The method of claim 2, wherein the proxy object represents an entry of a row set.

4. The method of claim 2, wherein the database result set is based, at least in part, on a database view.

5. The method of claim 2, further comprising:

reading the object metadata from an attribute descriptor, wherein the attribute descriptor is to specify a data type and a name for each object attribute.

6. The method of claim 1, wherein providing the object member data from the proxy object comprises at least one of:

providing an object attribute from the proxy object; and

providing an object reference from the proxy object.

7. The method of claim 1, further comprising:

navigating the proxy object via a proxy object iterator.

8. The method of claim 1, further comprising:

reading, at a first server instance persistence manager, persistent object metadata from the relational database; and

generating another proxy class and another proxy object based, at least in part, on the metadata stored in the relational database.

9. The method of claim 8, further comprising:

providing a transactional lock for at least a portion of the other proxy object from a central instance transaction manager to a first service instance transaction manager.

10. The method of claim 9, further comprising:

providing a transactional lock for at least a portion of the other proxy object from the first server instance transaction manager to a second server instance transaction manager.

11. The method of claim 8, further comprising:

creating a fixed size memory block for the internal data store of the central instance persistence manager; and

creating a fixed size memory block for an internal data store of the first server instance persistence manager.

12. An apparatus comprising:

an application to request member data of a persistent object; and

a processor and logic executable thereon to,

generate a proxy class based on metadata stored in a relational database;

receive a request to access member data of a persistent object associated with the proxy class; and

provide the member data from a proxy object.

13. The apparatus of claim 12, wherein the logic executable thereon to generate the proxy object based, at least in part, on object metadata stored in the relational database comprises logic to:

access a database result set to obtain the metadata; and

create the proxy object based, at least in part, on the metadata obtained from the database result set.

14. The apparatus of claim 13, wherein the proxy object represents an entry of a row set.

15. The apparatus of claim 13, wherein the database result set is based, at least in part, on a database view.

16. The apparatus of claim 13, wherein the logic executable thereon further comprises logic to:

read the metadata from an attribute descriptor, wherein the attribute descriptor is to specify a data type and a name for each object attribute.

17. An article of manufacture comprising:

an electronically accessible medium providing instructions that, when executed by an apparatus, cause the apparatus to

generate a proxy class based on metadata stored in a relational database;

receive a request to access member data of a persistent object associated with the proxy class; and

provide the member data from a proxy object.

18. The article of manufacture of claim 17, wherein the instructions that, when executed by the apparatus, cause the apparatus to generate the proxy class based, at least in part, on metadata stored in the relational database, cause the apparatus to:

access a database result set to obtain the object metadata; and

create the proxy class and proxy object based on the metadata stored in the relational database.

19. The article of manufacture of claim 18, wherein the proxy object represents an entry of a row set.

20. The article of manufacture of claim 18, wherein the database result set is based, at least in part, on a database view.