Web Reference: All triggers define implicit variables that allow developers to access run-time context. These variables are contained in the System.Trigger class. Returns true if the current context for the Apex code is a trigger, not a Visualforce page, a Web service, or an executeanonymous () API call. According to the documentation, Trigger.old and Trigger.oldMap are only available in update and delete Triggers. Are these variables null otherwise, or are they just empty? Mar 20, 2026 · Trigger.Old is a context variable in Salesforce Apex triggers. It is a read-only list of the old records that are being updated or deleted. This list contains the original values of the records as they existed in the Salesforce database before the current trigger event was executed.
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