郑州大学西亚斯国际学院
毕业论文外文资料翻译
学院：电子信息工程学院
专业：软件工程（软件开发方向）
补天士prime
姓名：xxxx
学号： xxxxxxxx
附件： 1外文原文 2外文资料翻译
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2013年04月25日
附件1：外文原文
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Databa Development Process
the way you look tonightBad on information engineering information systems planning databa is a source of development projects. The new databa development projects is usually in order to meet the strategic needs of organizations, such as improving customer support, improve product and inventory management, or a more accurate sales forecast. H owever, many more databa development project is the bottom-up approach emerging, such as information system ur needs specific information to complete their work, thus beginning a project request, and as other information systems experts found that organizations need to improve data management and begin new projects. Bottom-up even in the circumstances, to t up an enterpri data model is also necessary to understand the existing databa can provide the necessary data, otherwi, the new databa, data entities and attributes can be added to the current data resources to the organization.
Both the strategic needs or operational information needs of each databa development projects normally concentrated in a databa. Some projects only concentrated in the databa d efinition, design and implementation of a databa, a s a follow-up to the basis of the development of information systems. However, in most cas, the databa and associated information processing f
unction as a complete information systems development project was part of the development.
one. System Development Life Cycle
Guide management information system development projects is the traditional process of system development life cycle (SDLC). System development life cycle is an organization of the databa designers a nd programmers information system compod of the Panel of Experts detailed description, development, maintenance and replacement of the entire information system steps. This process is becau Waterfall than for every step into the adjacent the next step, that is, the information system is a specification developed by a piece of land, every piece of the output is under an input. However shown in the figure, the steps are not purely linear, each of the steps overlap in time (and thus
can manage parallel steps), but when the need to reconsider previous decisions, but also to roll back some steps ahead. (And therefore water can be put back in the waterfall!) The system development life cycle including each stage and databa development-related activities, therefore, the question of databa management systems throughout the entire development process. In Figure 5 we repeat of the system development life cycle stage of the ven, and outlines the common databa
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a t each stage of development activities. Plea note that the systems development life cycle stages and databa development steps exists between the relationship between the concept of modeling data in both systems development life cycle stages between.
1.1 Enterpri Modeling
Databa development process from the enterpri modeling (system development life cycle stage of the project feasibility studies, and to choo a part)
Organizations t the scope and general databa c ontent. Enterpri modeling in information systems planning and other activities, the activities determine which part
of information systems need to change and strengthen the entire organization and outlines the scope of data. In this step, check the current databa a nd information systems, development of the project as the main areas of the nature of the business, with a very general description of each term in the development of information systems when needed data. Each item only when it achieved the expected goals of organizations can be when the next step.
1.2 Conceptual Data Modeling
One has already begun on the Information System project, the concept of data modeling pha of the information systems needs of all the data. It is divided into two stages. F irst, it began the project in the planning stage. At the same time outlining the establishment of other documents to the existing databa without considering the circumstances specific development projects in the scope of the required data. This category only includes high-level data (entities), and main contact. Then in the system development life-cycle analysis stage must have a management i nformation system t the entire organization Details of the data model definition of all data attributes, listing all data types that all data inter-entity business linkages, defining description of the full data
integrity rules. In the analysis pha, but also the concept of inspection data model (also called the concept behind the model) and the goal of information systems ud to explain other aspects of the model of consistency categories, such as processing steps, rules and data processing time of timing. However, even if the concept is such detailed data model is only preliminary, becau follow-up information system life cycle activities in the design of rvices, statements, d isplay and inquiries may find that missing element or mistakes. Therefore, the concept of data often said that modeling is a top-down manner, its areas of operation from the general understanding of the driver, rather than the specific information processing activities by the driver.
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1.3 Logical Databa Design
Logical databa design from two perspectives databa d evelopment. First, the concept of data model transform into relational databa theory bad on the criteria that means - between. Then, as the design of information systems, every computer procedures (including procedures for the input and output format), databa support rvices, statements, and inquiries revealed that a detailed examination. In this so-called Bottom-up analysis, accurate verification of the need to maintain the databa a nd the data in each affairs, statements and so on the needs of tho in the nature of the data. For each parate statements, rvices, and so on the analysis must take into account a specific, limited but complete databa view. When statements, rvices, and other analysis might be necessary to change the concept of data model. Especially in large-scale projects, the different analytical systems development staff and the team can work independently in different procedures or in a centralized, the details of their work until all the logic design stage may be displayed. In the circumstances, logic databa design stage must be the original concept of data model and ur view the independent or merged into a comprehensive design. In logic design information systems also identify additional information processing needs of the new demands at this time must be integrated into the logic of earlier identified in the databa d esign.Logical databa design is bad
entrepreneur>fismon the final step for the formation of good data specifications and determine the rules, the combination, the data after consultation specifications or converted into basic atomic element. Most of today's databa, the rules from the
relational databa theory and the process known as standardization, #. This step is the result of management of the data have not cited any databa management system for a complete description of the databa map. Logical databa design completed, we began to identify in detail the logic of the computer program and maintenance, the report contents of the databa for inquiries.
conca1.4 Physical databa design and definition
Physical databa design and definition pha decisions computer memory (usually disk) databa i n the organization, definition of According to the library management system for physical structure, the procedures o utlined processing rvices, produce the desired management information and decision support statements. The objective of this stage is to design an effective and safe management of all data-processing databa, the physical databa design to c loly integrate the information systems of other physical aspects of the design, including procedures, computer hardware, operating systems and data communications networks.大连日语培训哪家好
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1.5 Databa Implementation
The databa prepared by the realization stage, testing and installation procedures for handling databas. D esigners can u the standard programming language (such as COBOL, C or Visual Basic), the dedicated databa processing languages (such as SQL), or the process of the non-exclusive language programming in order to produce a statement of the fixed format, the result will be displayed, and may also include charts. In achieving stage, but also the completion of all the databa files, training urs for information systems (databa) ur tup program. The final step is to u existing sources of information (documents legacy applications and databas and now needs new data) loading data. Loading data is often the first step in data from existing files and databas t o an intermediate format (such as binary or text files) and then to turn intermediate loading data to a new databa. Finally, running databas a nd related applications for the actual ur maintenance and retrieval of data. In operation, the regular backup databa and the databa when damaged or affected resume databa.
1.6 Databa maintenance
During the databa in the progressive development of databa maintenance. In this
