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Apex Complete Course / Triggers

Bulkified trigger

Learn Bulkified trigger in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.

12 min read • Intermediate

Bulkified trigger is an atomic Apex topic inside Triggers. The example below uses the actual construct named by the lesson rather than a generic placeholder.

Focus on what Bulkified trigger changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.

Topic-specific example

apex-05-09-bulkified-trigger.cls
apex Try It Live 
trigger ContactBulk on Contact (after insert) { Set<Id> accountIds=new Set<Id>(); for(Contact c:Trigger.new) if(c.AccountId!=null) accountIds.add(c.AccountId); List<Account> accts=[SELECT Id FROM Account WHERE Id IN :accountIds]; }
Edge case / engineering note

Change the key input in this Apex example and predict the result first; the named construct should be the reason the behavior changes.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Bulkified trigger Mastery Check →
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