In dealing with similar production process the logic how to deal with the better! ? Production process is the first step, the second step, third step... , these steps, these steps will have to modify, delete, position change, etc., in the preservation of time is very troublesome, because you don't know the steps that are new, or modified, it including the picture...
I think the most convenient way is to delete all old, writes the new database, but that there will be a lot of garbage data, step by step or judgment is to modify or add or delete, so good trouble!
Dear past bosses have a more elegant way! ?