System and method for direct accessing of remote data

• US 5,745,748 A
• Filed: 12/09/1994
• Issued: 04/28/1998
• Est. Priority Date: 12/09/1994
• Status: Expired due to Term

• Current Assignee: Sprint Communications Company LP (Deutsche Telekom AG)
• Original Assignee: Sprint Communications Company LP (Deutsche Telekom AG)
• Inventors: Ahmad, Nauman, Burnett, Joseph Arthur
• Primary Examiner(s): Amsbury, Wayne
• Assistant Examiner(s): Coby, Frantz
• Application Number:
  US08/352,942
• Time in Patent Office: 1,236 Days
• Field of Search: 364/200, 395/600, 395/200.01, 395/182.03, 395/200.09, 395/182.04, 395/601, 395/650, 395/610, 395/611, 395/604
• US Class Current: 709/217
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: Y10S 707/922 Communications
• CPC Class Codes: Y10S 707/959 Network

Abstract

A data access client program resides on a local computer and a data access server program resides on a remote computer. The programs are adapted to enable an application program on the local computer to access data stored on the remote computer. The client and server programs are adapted to communicate with one another over a communication link, preferably one employing the Advanced Program to Program Communication (APPC) protocol. The user stores the attributes of remote files to be accessed on a predetermined computer. When the application program on the local computer issues a remote data access request, the data access client program communicates the request to the data access server program. The server is configured to obtain the previously stored file attributes and to access the data requested by the application program based thereon. The server returns the requested information to the client, which in turn provides the information to the application program. The invention is adapted for use with a COBOL application development system and for accessing an individual record of the remote data file, such as during debugging operations in the application development system.

Claims

1. A system for accessing a data file on a remote computer by an application program within a COBOL application development system on a local computer over a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

a data access server program adapted to run on the remote computer, to communicate over the communication link, to obtain said file attributes and thereby to access the data file; and

a data access client program adapted to run on the local computer, said data access client program being adapted to communicate with said data access server program over the communication link and with the application program within the COBOL application development system on the local computer, thereby enabling the application program to access the data file.

2. The system of claim 1, wherein said data access server program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

3. The system of claim 1, wherein said data access client program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

4. The system of claim 1, wherein said data access client program and said data access server program are adapted to access the data file on the remote computer stored in a sequential access format.

5. The system of claim 1, wherein said data access client program and said data access server program are adapted to access the data file on the remote computer stored in an indexed sequential access format.

6. The system of claim 1, wherein said data access client program and said data access server program are adapted to access the data file on the remote computer stored in a random access format.

7. The system of claim 1, wherein said data access client program and said data access server program are adapted to access the data file on the remote computer stored in a format accessible by a database management program.

8. The system of claim 7, wherein the format is the Information Management System format.

9. The system of claim 1, further comprising means for communicating network security information to the remote computer from the local computer to enable the application program on the local computer to access the data file.

10. The system of claim 1, wherein said data access server program and said data access client program are adapted to enable the application program on the local computer to modify data on the remote computer.

11. The system of claim 1, wherein said data access server program and said data access client program are adapted to enable the application program on the local computer to store data on the remote computer.

12. The system of claim 1, wherein said predetermined computer is the remote computer.

13. The system of claim 1, wherein said predetermined computer is the local computer.

14. The system of claim 1, further comprising a map file stored on the local computer containing a file designator for the data file.

15. The system of claim 14, wherein said data access client program is further adapted to determine, based on said map file, whether to communicate with said data access server program to access the data file.

16. The system of claim 1, wherein said system is adapted to access the data file one record at a time.

74. The system of claim 1, further comprising means for interactively storing said file attributes in said attribute file.

17. A system for accessing a data file on a remote computer by an application program within a COBOL application development system executing on a local computer, said system comprising:

a remote computer containing the data file;

a local computer;

a communication link enabling the transfer of data between said remote computer and said local computer;

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

a data access server program adapted to run on said remote computer, to communicate over said communication link, to obtain said file attributes and to access the data file; and

a data access client program adapted to run on said local computer, said data access client program being adapted to communicate with said data access server program over said communication link and with the application program within the COBOL application development system on said local computer, thereby enabling the application program to access the data file.

18. The system of claim 17, wherein said data access server program is adapted to communicate over said communication link using the Advanced Program to Program Communication protocol.

19. The system of claim 17, wherein said data access client program is adapted to communicate over said communication link using the Advanced Program to Program Communication protocol.

20. The system of claim 17, wherein said data access client program and said data access server program are adapted to access the data file on said remote computer stored in a sequential access format.

21. The system of claim 17, wherein said data access client program and said data access server program are adapted to access the data file on said remote computer stored in an indexed sequential access format.

22. The system of claim 17, wherein said data access client program and said data access server program are adapted to access the data file on said remote computer stored in a random access format.

23. The system of claim 17, wherein said data access client program and said data access server program are adapted to access the data file on said remote computer stored in a format accessible by a database management program.

24. The system of claim 23, wherein the format is the Information Management System format.

25. The system of claim 17, further comprising means for communicating network security information to said remote computer from said local computer to enable the application program on said local computer to access the data file.

26. The system of claim 17, wherein said data access server program and said data access client program are adapted to enable the application program on said local computer to modify data on said remote computer.

27. The system of claim 17, wherein said data access server program and said data access client program are adapted to enable the application program on said local computer to store data on said remote computer.

28. The system of claim 17, wherein said predetermined computer is said remote computer.

29. The system of claim 17, wherein said predetermined computer is said local computer.

30. The system of claim 17, further comprising a map file stored on said local computer containing a file designator for the data file on said remote computer.

31. The system of claim 30, wherein said data access client program is further adapted to determine, based on said map file, whether to communicate with said data access server program to access the data file.

32. The system of claim 17, wherein said system is adapted to access the data file one record at a time.

33. A remote data access method for use in a data processing system having a remote computer containing data, a local computer containing an application program within a COBOL application development system adapted to access data, and a communication link enabling the transfer of data between the remote computer and the local computer, said method comprising:

storing an attribute file on a predetermined computer, the attribute file containing file attributes for a data file residing on the remote computer;

issuing a file transaction request from the application program to access the data file;

transmitting the file transaction request from the local computer to the remote computer over the communication link;

accessing the data file as directed by the file transaction request and the file attributes; and

transmitting over the communication link the results of the file transaction request from the remote computer to the application program within the COBOL application development system on the local computer.

34. The method of claim 33, wherein the remote computer is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

35. The method of claim 33, wherein the local computer is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

36. The method of claim 33, wherein the data file has a sequential access format.

37. The method of claim 33, wherein the data file has an indexed sequential access format.

38. The method of claim 33, wherein the data file has a random access format.

39. The method of claim 33, wherein the data file is stored in a format accessible by a database management program.

40. The method of claim 39, wherein the format is the Information Management System format.

41. The method of claim 33, further comprising communicating network security information to the remote computer from the local computer to enable the application program on the local computer to access the data file.

42. The method of claim 33, wherein accessing the data file on the remote computer includes modifying data on the remote computer.

43. The method of claim 33, wherein accessing the data file on the remote computer includes storing data on the remote computer.

44. The method of claim 33, wherein the predetermined computer is the remote computer.

45. The method of claim 33, wherein the predetermined computer is the local computer.

46. The method of claim 33, further comprising storing in a map file on the local computer a file designator for the data file.

47. The method of claim 46, further comprising determining from the map file whether to transmit a file transaction request from the local computer to the remote computer.

48. A system for accessing a data file stored in the Information Management System (IMS) format on a remote computer by an application program within a COBOL application development system on a local computer over a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

a data access server program adapted to run on the remote computer, to communicate over the communication link, to obtain said file attributes and based thereon to access the data file; and

a data access client program adapted to run on the local computer, said data access client program being adapted to communicate with said data access server program over the communication link and with the application program within the COBOL application development system on the local computer, thereby enabling the application program to access the data file.

49. The system of claim 48, wherein said data access server program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

50. The system of claim 48, wherein said data access client program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

51. The system of claim 48, wherein said file attributes include the name of a Data Base Definition for the data file.

52. The system in claim 51, wherein said file attributes include the name of a Program Specification Block for the data file.

53. The system of claim 52, wherein said file attributes include a Program Control Block within the Program Specification Block for the data file.

54. The system of claim 53, wherein said predetermined computer is the local computer.

55. The system of claim 54, further comprising means for interactively storing said file attributes in said attribute life.

56. A system for accessing a data file stored in a sequential access format on a remote computer by an application program within a COBOL application development system on a local computer over a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

a data access server program adapted to run on the remote computer, to communicate over the communication link, to obtain said file attributes and based thereon to access the data file; and

a data access client program adapted to run on the local computer, said data access client program being adapted to communicate with said data access server program over the communication link and with the application program within the COBOL application development system on the local computer, thereby enabling the application program to access the data file.

57. The system of claim 56, wherein said data access server program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

58. The system of claim 56, wherein said data access client program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

59. The system of claim 56, wherein said predetermined computer is the remote computer.

60. The system of claim 56, wherein said predetermined computer is the local computer.

61. The system of claim 56, further comprising a map file containing a file designator for the data file.

62. The system of claim 56, wherein said data access client program is further adapted to determine, based on said map file, whether to communicate with said data access server program to access the data file.

75. The system of claim 56, further comprising means for interactively storing said file attributes in said attribute file.

63. A system for accessing a data file stored in an indexed sequential access format on a remote computer by an application program within a COBOL application development system on a local computer over a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

a data access server program adapted to run on the remote computer, to communicate over the communication link, to obtain said file attributes and based thereon to access the data file; and

a data access client program adapted to run on the local computer, said data access client program being adapted to communicate with said data access server program over the communication link and with the application program within the COBOL application development system on the local computer, thereby enabling the application program to access the data file.

64. The system of claim 63, wherein said data access server program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

65. The system of claim 63, wherein said data access client program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

66. The system of claim 63, wherein said predetermined computer is the remote computer.

67. The system of claim 63, wherein said predetermined computer is the local computer.

68. The system of claim 63, further comprising a map file containing a file designator for the data file.

69. The system of claim 63, wherein said data access client program is further adapted to determine, based on said map file, whether to communicate with said data access server program to access the data file.

76. The system of claim 63, further comprising means for interactively storing said file attributes in said attribute file.

70. A system for storing the file attributes of a data file stored on a remote computer from a local computer having a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

a file attribute client program adapted to run on the local computer, said file attribute client being adapted to communicate over the communication link to enable the user to enter file attributes for the data file; and

a file attribute server program on the remote computer adapted to communicate over the communication link and adapted to receive the file attributes from said file attribute client and to store the file attributes in an attribute file on a predetermined computer.

71. The system of claim 70, wherein said file attribute server program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

72. The system of claim 70, wherein said file attribute client program is adapted to communicate over the communication link using the Advanced Program to Program Communication protocol.

73. The system of claim 70, wherein the predetermined computer is the remote computer.

77. A system for accessing a data file on a remote computer by an application program within a COBOL application development system on a local computer over a communication link enabling electronic data transfer between the local computer and the remote computer, said system comprising:

an attribute file stored on a predetermined computer, said attribute file containing file attributes for the data file;

data access server means on the remote computer for communicating over the communication link, obtaining said file attributes and accessing the data file; and

data access client means on the local computer for communicating with said data access server means over the communication link and with the application program within the COBOL application development system on the local computer, thereby enabling the application program to access the data file.

78. The system of claim 77, wherein the data file is stored in one of a plurality of formats and said data access server means and said data access client means are adapted to access the data file when stored in each of said plurality of formats.

79. The system of claim 77, further comprising means for communicating network security information to the remote computer from the local computer to enable the application program on the local computer to access the data file.

80. The system of claim 77, wherein said predetermined computer is the remote computer.

81. The system of claim 77, wherein said predetermined computer is the local computer.

82. The system of claim 77, further comprising a map file stored on the local computer containing a file designator for the data file.

83. The system of claim 82, wherein said data access client means is further adapted to determine, based on said map file, whether to communicate with said data access server means to access the data file.

84. The system of claim 77, further comprising means for interactively storing said file attributes in said attribute file.

85. The system of claim 77, wherein said system is adapted to access the data file one record at a time.