Method of imposing multi-object constraints on data files in a data processing system
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United States of America Patent
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Apr 18, 1995
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app pub date -
May 17, 1994
filing date -
Aug 7, 1991
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Abstract
A method, in a data processing system, of imposing constraints on data files which are changed by update statements, includes the steps of: a) identifying a particular object of the update O.sub.x and a particular attribute being updated; b) finding an applicable constraint based on the particular attribute being updated; c) converting the particular update object O.sub.x to at least one other object which is in the applicable constraint and is different than the update object O.sub.x ; and, d) generating an error message, if after the update, the applicable constraint is not satisfied by any object from the converting step.
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