Research And Development Of IC Gas Card System Based On .NET

In recent years,with the rapid development of China's economy,fueling for motor transport in the circulation of commodities as an important industry,in people's economic life and daily life plays an increasingly important position.Oil notes,cash and other traditional means of payment to all the disadvantages brought about by the oil companies,makes the oil companies determined to reform by means of advanced technology,management and other measures.Therefore,the use of available storage capacity,data confidentiality,and anti-interference ability,reliable storage,card reader equipment,stability,operation speed,ability to work offiine,etc.The smart IC cards as refueling,cartier billing and management,no doubt is inevitable.In this paper,aiming at Sinopec Changjiang Fuel Company's actual needs,based on the.NET 2.0 development framework,as in Visual Studio 2005 development platform,and with Oraclel0g and Access2000 as a distributed database system,a distributed refueling IC card system was developed,which has comprehensive functions such as gas card processing,recharging,consumption,and querying statistics and so on.The main contents of this paper include the following:(1)Analyzed the distributed database system architecture of the technical features. Studied the data replication technology.Aim at the characteristics of slow network environment such as small network bandwidth,slow transmission,poor network reliability,etc,DEA Scheme,a modification stamp and time stamp-based asynchronous data replication scheme,was made.(2)Analyzed the business process of Sinopec Changjiang Fuel Company's gas stations and the gas card business system requirements.In accordance with the principles of system design objectives and functions of the overall architecture design, the overall design of the system and the delineation of functional modules were given.(3)In accordance with system design,the various functions of the system were achieved.(4)Combined with the actual situation of the system,a Data Exchange sub module was realized according to DEA scheme.The module has reached in the purpose of inter-site data replication and reduces affects caused by slow network to the system at a large grade.This paper focuses on the research of data replication in distributed database systems and the realization of DEA scheme.Practice has proved that,DEA scheme is feasible,and is competent to data replication under the slow network environment.