Three-layer structure profile
(This article is reproduced from Software Engineering Expert Network www.21cmm.com)
In recent years, with the development of computer technology and network technology, modern enterprises have encountered huge opportunities and challenges. Enterprises have begun to establish new management information systems (MIS) or revised the original management information system. In this process, the choice of MIS system platform mode is the main problem encountered by the system designer. This article tries to explore this issue in conjunction with our own practical experience.
The MIS system platform mode is generally divided into four types: host terminal mode, file server mode, client / server mode (Client / Server, referms C / S) and web browser / server mode (Browser / Server, referred to as B / S ).
Host terminal mode is gradually eliminated due to limited hardware selection, hardware investment is not guaranteed. The file server mode only applies to small-scale local area networks. For many users, the amount of data is large, and the network bottleneck will generate network bottlenecks, especially on the Internet. Therefore, modern enterprise MIS system platform mode should mainly consider C / S mode and B / S mode.
First it simplifies the client. It does not need to install different client applications on different clients like C / S mode, and only install universal browser software. This not only saves client's hard disk space and memory, but also makes the installation process easier, and the network structure is more flexible. Suppose a business decision layer is to open a meeting to discuss inventory issues, and they only need to query data directly from the conference room, and then display it to everyone. Even attendees can also put the laptop on the web jack of the conference room to query the relevant data.
Second, it simplifies the development and maintenance of the system. System developers do not need to develop different customer applications for different levels of users, just implement all functions on the web server, and set permissions for users of each group on different functions. Each user calls a different handler on the Web server through the HTTP request to complete query or modification of the data. Modern enterprises are facing a new day-changing competitive environment, and the update and adjustment of internal operation mechanisms in the enterprise have become gradually frequent. More flexibility is more flexible relative to C / S, B / S. When the situation changes, it does not need to upgrade every existing client application, and only the service handler on the web server will be revised. This not only improves the company's operational efficiency, but also saves a lot of troublesome work during maintenance. If a company has thousands of clients and is distributed in different locations, it will be more important.
Again, it makes the user's operation easier. For C / S mode, the client application has its own specific specifications, and users need special training. When using B / S mode, the client is just a simple and easy to use browser software. Whether it is a decision-making layer or the personnel of the operating layer, it can be used directly without training. This characteristic of the B / S mode also makes less restriction factors maintained by the MIS system.
Finally, B / S is especially suitable for online information release, making the traditional MIS functionality. This is what C / S cannot be implemented. And this new online information publishing function is especially required for modern companies. This makes the business's written documents can be replaced by electronic documents, which improves the work efficiency of the company, so that the company's administrative procedures simplifies, saves humanity.
