s="literal">DB_KEYFIRST</code>
        </p>
            <p>
            For databases that do not support duplicates, this method behaves
                
                <span>
                    exactly the same as if a default insertion was performed.
                </span>
                If the database supports duplicate records, 
                    
                    <span>
                        and a duplicate sort function has been specified, the
                        inserted data item is