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Chapter - 9 Apex Triggers >

Trigger.oldMap | Context Variables in APEX Triggers

Trigger.oldMap | Context Variables in APEX Triggers

What You’ll Learn


S2 Labs

Trigger.oldMap

A map of IDs to the old version of the sObject records.

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

Note:

This map is only available in update & delete triggers.

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