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Interactive error handling means in database management

  • US 4,888,690 A
  • Filed: 03/21/1988
  • Issued: 12/19/1989
  • Est. Priority Date: 01/11/1985
  • Status: Expired due to Term
First Claim
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1. For use in a relational database management system, interactive error-handling means, comprisingdisplay means and input means,storage means providing:

  • record occurrence signals comprising record occurrences in a relational database;

    status signals;

    currency signals;

    format signals; and

    message file signals representing the characters of displayable error message; and

    providing means defining an operation buffer and first and second record occurrence buffers,calling means,operation means, andfetch means,said operation means comprising;

    means responsive to an operation call signal for validating an operation selected to be performed with respect to record occurrence signals in said second record occurrence buffer and providing an output signal having one of two values, said values representing valid and invalid conditions,means responsive to a said invalid condition value of said output signal for generating corresponding status invalid signals, and providing an operation return signa,means responsive to a said valid condition value of said output signal for performing said selected operation with respect to said record occurrence signals, and providing an operation return signal,said fetch means comprising;

    noninteractive means responsive to a fetch call signal, a noninteractive condition, and said currency signals for retrieving record occurrence signals from said database, for placing said retrieved signals into said first and second buffers, for incrementing said currency signals, and for providing a fetch return signal, andinteractive means responsive to a fetch call signal and an interactive condition signal, and comprisingmeans responsive to said status valid signals and to said currency signals for retrieving said record occurrence signals from said database, and for copying said retrieved signals into said first and second buffers, andmeans responsive to said status invalid signals for copying said record occurrence signals from said first to said second buffer, anddisplay means responsive to said format signals and to said signals in said second buffer for controlling said display to display a representation of said record occurrence, and responsive to operator input signals from said input means, for placing an operation selection signal in said operation buffer, and providing a fetch return signal,said display means being further responsive to said status invalid signals and said message signals for displaying representations of a said error message with said record occurrence representation, andsaid calling means being responsive to said operation return signals and to said status invalid signal for providing a fetch means call signal, and responsive to said fetch return signal for providing an operation call signal.

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