| 摘要 |
A database trigger generates a return code having the effect of inhibiting further executions of the trigger within a pre-defined scope of execution. Preferably, the pre-defined scope is a task or process executing on behalf of a particular user. Upon first encountering the applicable trigger condition, the corresponding trigger is fired normally. Internal logic within the trigger determines whether it is necessary to call the same trigger again within the same scope, and if not, generates corresponding return data. A database management system which manages the trigger and causes it to automatically fire intercepts the return data and disables further firing of the trigger for the pre-defined scope.
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