Computer program product for object specification, generation, and management in a distributed database

• US 5,581,758 A
• Filed: 06/06/1995
• Issued: 12/03/1996
• Est. Priority Date: 10/05/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Burnett, Colin J., Haas, Garry L.
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): Lintz, Paul R.
• Application Number:
  US08/466,908
• Time in Patent Office: 546 Days
• Field of Search: 395/600, 395/650, 395/800, 395/200.1
• US Class Current: 1/1
• CPC Class Codes: G06F 16/256 in federated or virtual databases
• CPC Class Codes: G06F 16/27 Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
• CPC Class Codes: G06F 16/275 Synchronous replication
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation
• CPC Class Codes: Y10S 707/99944 Object-oriented database structure
• CPC Class Codes: Y10S 707/99945 Object-oriented database structure processing

Abstract

In a distributed data processing system comprising a plurality of different computer systems, each system having a central processing unit (CPU), memory, a database stored in the memory, and a DBMS, a computerized method is provided for generating a plurality of objects in a standardized format. A unique object identifier is associated with each of the plurality of objects. Each unique object identifier is stored in memory in association with at least one object location type or instance, an object generation specification for each object location type or instance, and a generation specification type. For a requested object type at a specified location, identifying from the computer memory an object generation specification, and a specification type. The requested object is generated in a standardized format from the specified location using the identified process type and the identified object generation specification.

Claims

1. A computer program product for use with a data processing system comprising a central processing unit (CPU), memory, and a plurality of database management systems (DBMSs) each associated with at least one database stored in the memory, wherein at least one DBMS is different from at least one other DBMS, said computer program product comprising:

a computer usable medium having computer readable program code means embodied in said medium for causing the generation of objects in a standardized format, said computer readable program code means comprising,

computer readable program code means for causing the data processing system to associate a unique object identifier with each of the plurality of objects;

computer readable program code means for causing the data processing system to store in a table in the memory each unique object identifier in association with at least one object location type or instance corresponding to a particular database instance, an object generation specification for each object location type or instance, and a generation specification type, wherein said object generation specification for each object location type or instance specifies how an object is to be generated from said particular database instance;

computer readable program code means for causing the data processing system to identify, for a requested object and a specified database, from the table in the memory, an object generation specification, and a generation specification type; and

computer readable program code means for causing the data processing system to generate in a standardized format the requested object from the specified database using the identified generation specification type and the identified object generation specification.

2. The computer program product of claim 1 wherein the object generation specification contains at least one qualifier identifier and requester supplied qualifier values are substituted for each qualifier identifier.

3. The computer program product of claim 1 wherein the requested object is the object generation specification having a requester supplied qualifier value substituted for each qualifier identifier in the object generation specification.

4. The computer program product of claim 1 wherein the object is a result of the object generation specification, having a requestor supplied qualifier value substituted for each qualifier identifier in the object generation specification, executed as an SQL statement by a DBMS.

5. The computer program product of claim 1 wherein the object is a result of the object generation specification executed as a program by a CPU with a requester supplied qualifier value substituted for each qualifier identifier program parameter.

6. The computer program product of claim 1 wherein the standardized format comprises a pointer to the requested object with an indicator of the size of the requested object.

7. The computer program product of claim 1 wherein said program code means for storing stores each unique object identifier in a set of at least one table in association with at least one object location, an object generation specification for each object location, and a generation specification type.

8. The computer program product of claim 7 further comprising computer readable program code means for causing said computer to add a new object identifier and associated information to the set of at least one table.

9. A computer program product for use in a data processing system comprising at least one database and a plurality of database management systems, said computer program product comprising:

a computer usable medium having computer readable program code means embodied in said medium for generating an object in a standardized format, said computer readable program code means comprising,

computer readable program code means for causing the data processing system to assign an object identifier to the object;

computer readable program code means for causing the data processing system to create a generation specification for the object, indicating how the object is to be generated for a particular system;

computer readable program code means for causing the data processing system to store in a table in a memory said object identifier and said generation specification; and

computer readable program code means for causing the data processing system to generate information about the object for said particular system in a standardized format using said stored generation specification.

10. The computer program product of claim 9, further comprising computer readable program code means for causing said computer to store a generation specification type indicating a type of said generation specification used to generate the object.

11. The computer program product of claim 9, further comprising:

computer readable program code means for causing said computer to receive from a routine a request to generate the object, wherein said request identifies the object by said object identifier and identifies a particular system; and

computer readable program code means for causing said computer to retrieve from said table said generation specification associated with the requested object for said identified system.

12. The computer program product of claim 11, wherein said program code means for causing said computer to receive comprises computer readable program code means for causing said computer to receive qualifier values from said routine;

and

wherein said program code means for causing said computer to generate comprises computer readable program code means for causing said computer to substitute said qualifier values into said generation specification to produce an SQL statement.

13. The computer program product of claim 11, wherein said program code means for causing said computer to receive comprises computer readable program code means for causing said computer to receive qualifier values from said routine, and

wherein said program code means for causing said computer to generate comprises computer readable program code means for causing said computer to substitute said qualifier values into said generation specification to produce the object.

14. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for generating an object in a standardized format, said device for use in a data processing system comprising at least one database and a plurality of database management systems, the method steps comprising the steps of:

assigning an object identifier to the object;

creating a generation specification for the object, indicating how the object is to be generated for a particular system;

storing in a table in a memory said object identifier and said generation specification; and

generating information about the object for said particular system in a standardized format using said stored generation specification.

15. The program storage device of claim 14, wherein the method steps further comprise the step of storing a generation specification type indicating a type of said generation specification used to generate the object.

16. The program storage device of claim 14, wherein the method steps further comprise:

receiving from a routine a request to generate the object, wherein said request identifies the object by said object identifier and identifies a particular system; and

retrieving from said table said generation specification associated with the requested object for said identified system.

17. The program storage device of claim 16, wherein said step of receiving comprises the step of receiving qualifier values from said routine, and

wherein said step of generating comprises the step of substituting said qualifier values into said generation specification to produce an SQL statement.

18. The program storage device of claim 16, wherein said step of receiving comprises the step of receiving qualifier values from said routine, and

wherein said step of generating comprises the step of substituting said qualifier values into said generation specification to produce the object.