Internet Building Materials Information System Cmpis Design And Realization

The Construction Material Price System of Shandong Province (CMPIS) is a distributed information system based on Internet. The main task of the system is to collecting the price of construction material in each city of Shandong province and to putting it out. Aiming at the characteristic of the system, we design a corresponding configuration which has the following major point. First, to improving the processing ability of the database server so as to realize the more connection of the clients with the few connection offered by the server, and the second, to implementing the safe access to the database.In the reserching of the project, we applied some new technology, the representatives of them are the middleware technology for three-tier network and the DBConnectionPool technology for the access to Web database.1. The middleware is a independent system software, the distributed system can share resources offered by mulriple technologies with it. The middleware stands on the top of the Server/Client model and due to manage the resources and communication of the computer. The middleware is a special kind of software with the primary task to accomplish the application independent of the OS, secondly, it can perform a reasonable management of the network resources.2. The technology of encrpytion verifying: The system will check the lock installed on the user's computer when logging in, if OK, then read the information storing in the lock and send it to Web Server. The Web Server will verify it.3. The dynamic Web site usually generate the Web page from the information stored in the database, every page will cause a access to the database. To establish a connection with the DB server, a mount of resource such as memory must be consumed and some other operations, for instance, the client verify, the security context config, also must be performed. If one Web application base on the DB create a connection which can be shared by multi-access, the capbility can be greatly improved. The DBConnectionManage has the responsibility for offering the adapter to each DBConnectionPool, every DBConnectionPool can be shared by any amount of access.4. Load balance: The Load balance offers a way to expand the capcity of the network equipments basing on the current network structure.It has two point:. The first, large amount of access are delivered into several node equipment to be dealed in order to reduce the user's waiting time, the second, theheavy load task are shared inseveral servers, and the results are gathered and returned to the user.According to the points above, this article make a detailed description in several chapters, basing on the theories and the technologies.