m:model is to get data( usually from database,but for simplicity you can just return a string as if it were from databases,it makes no difference from controller
v:view is for presentation. just to show the data in various way,or simply display it the way it is
c:controller is the commander who decide which data to present using which kind of view
all with object .
alter table ttt change create_time date timestamp default current_timestamp;