byte  result[] =  null ;
conn.setAutoCommit(false);
      LargeObjectManager lobj =   ((org.postgresql.PGConnection)conn).getLargeObjectAPI();
PreparedStatement stmt =
 	 conn.prepareStatement("SELECT object_data FROM client_object WHERE object_name = ?");


      stmt.setString( 1 , name);
      ResultSet rs = stmt.executeQuery();
       if  (rs.next()){        
         int  oid = rs.getInt( 1 );
        LargeObject obj = lobj.open(oid, LargeObjectManager.READ);       
        obj.read(result,  0 , obj.size());        
        obj.close();
      }