Scheme selection and decision-making is the important link of the feasibility study phase, determines the success or failure of the software project and benefit, determines the future and destiny of the entire project. For software project scheme selection and decision-making difficulties on the basis of study selection and decision theory method, show the specific examples of decision-making. The main research study the common methods of operational research, including definite decision-making, Uncertain decision-making, risk decision-making etc, in which Uncertain decision-making studied max-min regret rate method and optimistic coefficient method. The results show that this research method has important practical value for software project scheme selection and decision-making, specific application should be combined with the software project reality, take various factors into account, make scientific decision-making.

Programmers manual compiling SQL statements according to relevant software development of database existing some troubles like workload big, easy to make a mistake, difficult to maintenance, this piece research designing on data manipulation class based on ADO.NET, realize the database operation through the data manipulation class. Based on expounding ADO.NET architecture and ADO.NET object model, concentrate on the researching two things: one is automatic generation of SQL statements, designing operation function, function Arguments or global arrays, deciding which type of SQL statements to generate, the other one is designing on data manipulation class, through re-loading, packaging and inheriting to design in data manipulation class for database. Results show that the research and application of data manipulation class solved a number of problems of traditional software development; it has important meaning for improve quality and efficiency of software development, it has become an important research direction of Database software development area.

Abstract. This paper describes several ways to achieve access to images in a database and on the field of application of these methods have drawbacks as well as a detailed comparison, we propose a feasible implementation. Finally, this approach will be promoted, making it suitable for a variety of media file formats

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Traditional urban public crisis management and emergency management, ancillary support role of information technology is obviously insufficient, and it impacts crises disposition effect, this paper proposes using decision support system ancillary support, studies multilayer architecture on urban public crisis DSS. Firstly, it studies universal DSS system architecture composed of human man-machine interaction, database, model base, knowledge base, method base and so on five parts; Then, based on the general structure, for the characteristics and functional requirements of urban public crisis decision, it studies multilayer architecture consists of support layer, application layer, integration layer, management layer and user layer, etc.; Finally, to describe the layers of multilayer architecture. The content of this paper is the foundation for the development of urban public crisis DSS.