(PHP 5, PECL OCI8 >= 1.1.0)
OCI-Lob::setBuffering — Changes current state of buffering for the large object
$on_off
   )
   Sets the buffering for the large object, depending on the value of the
   on_off parameter. 
  
Use of this function may provide performance improvements by buffering small reads and writes of LOBs by reducing the number of network round-trips and LOB versions. OCI-Lob::flush() should be used to flush buffers, when you have finished working with the large object.
on_off
     
       TRUE for on and FALSE for off.
      
   成功时返回 TRUE, 或者在失败时返回 FALSE. Repeated calls to this method with the same flag will
   return TRUE.