Salesforce Platform Developer I Certification Guide

Code solution for upserting records

First, we will write the code to update the existing records with an external ID:

// Define a counter to compile the external idInteger iCounter = 1;// Select the person recordsList<Person__c> lstPersons = new List<Person__c>([SELECT ID FROM Person__c]);// loop through the person records and update the External ID with the string value of the counterFor (Person__c thePerson : lstPersons){ thePerson.External_Id__c = String.valueOf(iCounter); // add the counter with 1 (to give the next record a new External Id) iCounter++;}Try { Update lstPersons;} catch (DMLException ex){ // all records should pass. If an error, adapt the data in the corresponding failed records System.debug(ex.getMessage());}

Verify whether ...