restrict any Trigger to fire only once


how we can avoid repeated or multiple execution of Trigger?

Triggers can fire twice, once before workflows and once after workflows, this is documented at
http://www.salesforce.com/us/developer/docs/apexcode/ Content/ apex_triggers_order_of_execution.htm:

“The before and after triggers fire one more time only if something needs to be updated. If the fields have already been set to a value, the triggers are not fired again.”

Workaround:

Add a static boolean variable to a class, and check its value within the affected triggers.

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