| Now the trade way of circulation of grain is still a handwork, such as grain auction, that need both side be on the spot, and then, the trade market organize the trade according to the trade regulation. The procedure of this trade method are complex, limited by the time and the space, so as unfavorable to the grain industry development. The DaLian northern grain trade market has realized the latent necessary of the e-commerce for the enterprise development, in other way, that the e-commerce or the invisible market will be a certainty selection and a trend for the traditional enterprise (commerce) in the future has become the common understanding inside circle. Therefore, the DaLian northern grain trade market decide to build the grain trade net sytem, so can create trade method , expand living space , and realize no-spot trade.This system use a three-tier architecture: the presentation layer , the business layer and the data layer. This system can supply more flexibility to writting software. The business layer also can be called the intermediate layer or the data logic layer, the pulse of the application program. It is responsible for the data processing in the system, and we package the grain trade regulation in this layer. The business logic module uses the COM+' s standard of Microsoft, absolutely inherited the property requirment of OOP such as seal and package, variable forms and dynamic link etc .By reusing the module,we can construct a new module rapidly , so it can improve the efficiency , and shorten the cycle for the programming.Firstly, this text simply discuss the major technology mentioned above, then show the detailed function of each module of the DaLian northern grain trade market net trade system. Finnally, expounds the method how to realize the function of the trade module of net trade system, combined all my programming experiences . |
