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do { code_to_execute } while (Boolean_condition);
//Code for do while loop List<apex_invoice__c> InvoiceList = [SELECT Id, APEX_Description__c, APEX_Status__c FROM APEX_Invoice__c LIMIT 20];//it will fetch only 20 records Integer i =0; do { InvoiceList[i].APEX_Description__c = 'This is the '+i+' Invoice'; System.debug('****Updated Description'+InvoiceList[i].APEX_Description__c);//This will print the updated description in debug log i++;//Increment the counter }while (i< 1); //iterate till 1st record only
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