ese handles are obtained from your 
                    
                    
                    
                    <span>Environment</span>
                    objects. They should normally be short-lived, and their usage is 
                    reasonably simple. To complete a transaction and save
                    the work it performed, you 
                    call its <code class="methodname">commit()</code> method. To
                    complete a transaction and discard its work, you call its
 