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Chapter - 9 Apex Triggers >

Trigger.old

Trigger.old

What You’ll Learn


S2 Labs

Trigger.old

This variable returns a list of the old version of sObject records. This list is only available in update and delete triggers

 

trigger ApexTrigger on Opportunity(before update) {
    // Only available in Update and Delete Triggers 
    for (Opportunity oldOpp: Trigger.old) {
        for (Opportunity newOpp: Trigger.new) {
            if (oldOpp.Id == newOpp.Id && oldOpp.Amount != newOpp.Amount) newOpp.Amount.addError('Amount cannot be changed'); // Trigger Exception 
        }
    }
}

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