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When I do an upsert DML which trigger code will handle it?

  1. Insert
  2. Update
  3. Both

?

Is there a pattern to solve potential duplicate executions if it is 3)?

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2 Answers 2

up vote 12 down vote accepted

For records that already exist, it will fire updates. For records that are new, it will fire inserts. As a result, an upsert can cause both insert and update triggers to fire if you have both new and existing records in your upsert, but they both won't fire for the same record.

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I've got a feeling that when you upsert records it does the inserts and the updates in separate batches. I can't find this documented though!

So for example you should be able to iterate through Trigger.new in an after insert and be confident that every record in Trigger.new is indeed a newly inserted record.

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