Design and realization of Shanghai public facilities information system

Taking the design and realization of Shanghai public facilities information system as an example,the method how to make the secondary development of the application-oriented geographical information system based on the MapX and object-oriented language VB 6.0 is discussed.The design mode,the overall framework and the design of the database are described in detail,some main functions of this system are introduced briefly and the realization of some functions are provided.