Question

I need to prevent duplicate names from been entered. This restriction needs to be imposed using a trigger. I want to know how i can restrict the DML operations from happening. Not sure of the usage of .addError in bulkified code.

 Set<string> Seta= new Set<string>();
 for(oj__c o:trigger.new)
 {
   Seta.add(c.name);
 }

 List<oj__c> listoj= new List<oj__c>();
 listoj=[select id from oj__c where name in :Seta]
 if listoj.size()>0
 trigger.new.adderror('Cannot have duplicate name');// i know this line is wrong. How can i stop the DML statement from excuting?

Answer 1

A good reference to what i was looking for could be found here.

http://www.salesforce.com/docs/developer/cookbook/Content/apex_dedupe.htm