CA2483963A1 - A method, computer program and computer for accessing data in an environment of multiple data repositories - Google Patents

A method, computer program and computer for accessing data in an environment of multiple data repositories Download PDF

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Publication number
CA2483963A1
CA2483963A1 CA002483963A CA2483963A CA2483963A1 CA 2483963 A1 CA2483963 A1 CA 2483963A1 CA 002483963 A CA002483963 A CA 002483963A CA 2483963 A CA2483963 A CA 2483963A CA 2483963 A1 CA2483963 A1 CA 2483963A1
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Canada
Prior art keywords
data
query
physical
sub
repository
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CA002483963A
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French (fr)
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CA2483963C (en
Inventor
Richard Dean Dettinger
Richard Joseph Stevens
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Workday Inc
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Individual
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Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2458—Special types of queries, e.g. statistical queries, fuzzy queries or distributed queries
    • G06F16/2471—Distributed queries
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2452—Query translation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99932—Access augmentation or optimizing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y10S707/99934—Query formulation, input preparation, or translation

Abstract

The present invention generally is directed to a system, method and article of manufacture for accessing data independent of the particular manner in which the data is physically represented. In one embodiment, a data repository abstraction layer provides a logical view of the underlying data repository that is independent of the particular manner of data representation. In one embodiment, the data repository abstraction layer specifies a location of data in a repository and a method for accessing the data. A query abstraction layer is also provided and is based on the data repository abstraction layer. A
runtime component performs translation of an abstract query into a form that can be used against a particular physical data representation.

Claims

1. A method of accessing data from a plurality of distributed data repositories, at least one of the data repositories using a different physical data representation from any other of the distributed data repositories, the method comprising:
receiving from a requesting entity, an abstract query according to a query specification of the requesting entity; wherein the query specification provides a definition for a plurality of logical fields of the abstract query such that the abstract query is defined independently of the underlying physical data representation of any data repository to.
be accessed;
partitioning the abstract query into a plurality of sub-queries, the sub-queries being grouped according to access method types; and transforming each sub-query into a query consistent with a particular physical data representation of the data according to the access method associated with the particular sub-query, wherein each access method is operable to map the logical fields to physical entities of the data by defining a method for accessing each of the physical entities and a location specification for each of the physical entities, the location specification identifying a data repository and the location of the data within the identified repository.

2. The method of claim 1, wherein the access method types are selected from a group comprising an SQL query type, an XML query type and a procedural request type.

3. The method of any preceding claim, wherein the abstract query comprises at least one selection criterion and a result specification.

4. The method of any preceding claim, further comprising:
for a physical entity of the data for a particular logical field of the plurality of logical fields, determining whether the physical entity of the data is located in a local cache; and if not, accessing a data repository specified by the location in the access method for the physical entity of the data.

5. A computer program comprising program code means adapted to perform the method of any of claims 1 to 4 when said program is run on a computer.

6. A computer for accessing data from a plurality of distributed data repositories, at least one of the distributed data repositories using a different physical data representation from any other of the distributed data repositories, the computer comprising:
a query specification;
means for receiving from a requesting entity, an abstract query according to the query specification, wherein the query specification provides a definition for a plurality of logical fields of the abstract query such that the abstract query is defined independently of the underlying physical data representation of any data repository to be accessed;
means for partitioning the abstract query into a plurality of sub-queries, the sub-queries being grouped according to access method types;
a data repository abstraction component comprising access methods which map logical fields to physical entities of the data by defining a method for accessing each of the physical entities, the data repository abstraction component also comprising a location specification for each of the physical entities, the location specification identifying a data repository and the location of the data within the identified repository;
and a runtime component for transforming each sub-query into a query consistent with a particular physical data representation of the data according to the access method associated with the particular sub-query.
CA2483963A 2002-04-25 2003-04-17 A method, computer program and computer for accessing data in an environment of multiple data repositories Expired - Lifetime CA2483963C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/131,984 US6954748B2 (en) 2002-04-25 2002-04-25 Remote data access and integration of distributed data sources through data schema and query abstraction
US10/131,984 2002-04-25
PCT/GB2003/001674 WO2003091829A2 (en) 2002-04-25 2003-04-17 A method, computer program and computer for accessing data in an environment of multiple data repositories

Publications (2)

Publication Number Publication Date
CA2483963A1 true CA2483963A1 (en) 2003-11-06
CA2483963C CA2483963C (en) 2010-11-16

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CA2483963A Expired - Lifetime CA2483963C (en) 2002-04-25 2003-04-17 A method, computer program and computer for accessing data in an environment of multiple data repositories

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US (1) US6954748B2 (en)
JP (1) JP2005524138A (en)
KR (1) KR100659889B1 (en)
CN (1) CN1647080B (en)
AU (1) AU2003229917A1 (en)
CA (1) CA2483963C (en)
WO (1) WO2003091829A2 (en)

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Publication number Publication date
KR100659889B1 (en) 2006-12-20
US6954748B2 (en) 2005-10-11
KR20040102053A (en) 2004-12-03
CN1647080A (en) 2005-07-27
CN1647080B (en) 2010-04-14
AU2003229917A1 (en) 2003-11-10
WO2003091829A3 (en) 2004-03-04
US20030208458A1 (en) 2003-11-06
JP2005524138A (en) 2005-08-11
WO2003091829A2 (en) 2003-11-06
CA2483963C (en) 2010-11-16

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