The Hospital Information System Based On Three-tier Construction

The client/server system based on two-tier construction is popular for a long time in the information system. There are two parts in system: one is client and the other is server. With the information increasing, the two-tier construction shows a lot defect. For example, inefficient; the operating load is unequal to the unwieldy system; the cost for maintaining the system is high; the investment in hardware of client is high.The three-tier construction that is unproved emerges as the times require. There is a media logical tier in three-tier construction. The three-tier construction solves the most problems that are in two-tier construction. With the virtue, three-tier construction becomes the main trend in developing information system.Hospital is important. Hospital information system (HIS) has developed for twenty years in China, which makes the information processing of hospital produce speedy results. The traditional HIS is based on two-tier construction. It is necessary to developing the HIS based on three-tier construction.The background of the paper is a hospital in south. Based on the thought of object, the paper adopts UML for selecting object, and develops the distributed application with PowerBuilder7.0. The database is Oracle. The HIS based on three-tier construction is practical.The paper analyses the current HIS, including the hospital organization, professional work, information characteristics, communication and discusses the current problems; introduces the total designs for system, including the goal, principle, the function of system, database and so on; expounds the design for hardware and network; explains the OOA, UML, three-tier construction; discusses the method of developing the information system based on three-tier construction; sets forth the distribution application with PowerBuilder in the three-tier construction of HIS, involving the client and server.The paper belongs to the application of type.The paper brings forth new ideas on HIS. It develops the distributed application of three-tier construction of HIS, making a breakthrough at traditional HIS based on two-tier construction. It brings better development on software.