Machine Room Reconstruction--on-demand drawing

The machine room reconfiguration began, withVBThe difference is that this is an object-oriented design concept. We are also aware of the design phase of software engineering:1, the definition of the problem, the feasibility study;2, demand analysis;3, summary design;4, detailed design;5, coding;6, testing;7, maintenance.

because we have already written the document before, so here is not too much to say, this is to follow the steps of the general walk again. Start with the second stage, demand analysis. This stage is mainly to determine what we are to let the system to do, with the experience of the previous system we can easily understand the function of the computer room charge system, here say some more controversial, in fact, how the system design is based on their own needs to design, different needs, design out of the nature is different. I have a new understanding of some functions, such as ① a student can register more than one card, but once the card is unregistered, it can no longer be used, that is, the card number can not be used; ② students on the machine, the machine preparation time is not charged, more than the preparation time is less than the time of the machine at least for a minute fee More than at least the time of the machine is charged by the hour. These two problems are VB version of the room is not very understanding of the place, because the database to the needs of their own design, here is to say their own understanding, convenient design.

There are some practical implementation of the design phase, here simply draw a few time series diagram, to do the representative it!

Machine Room Reconstruction--on-demand drawing