計算機外文翻譯---數(shù)據(jù)庫開發(fā)過程-文庫吧資料
2025-05-21 17:25本頁面
【正文】 hen needed data. Each item only when it achieved the expected goals of organizations can be when the next step. Data Modeling One has already begun on the Information System project, the concept of data modeling phase of the information systems needs of all the data. It is divided into two stages. First, it began the project in the planning stage. At the same time outlining the establishment of other documents to the existing database without considering the circumstances specific development projects in the scope of the required data. This category only includes highlevel data (entities), and main contact. Then in the system development lifecycle analysis stage must have a management information system set the entire organization Details of the data model definition of all data attributes, listing all data types that all data interentity business linkages, defining description of the full data integrity rules. In the analysis phase, but also the concept of inspection data model (also called the concept behind the model) and the goal of information systems used 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, because followup information system life cycle activities in the design of services, statements, display and inquiries may find that missing element or mistakes. Therefore, the concept of data often said that modeling is a topdown manner, its areas of operation from the general understanding of the driver, rather than the specific information processing activities by the driver. 3. Logical Database Design Logical database design from two perspectives database development. First, the concept of data model transform into relational database theory based on the criteria that means between. Then, as the design of information systems, every puter procedures (including procedures for the input and output format), database support services, statements, and inquiries revealed that a detailed examination. In this socalled Bottomup analysis, accurate verification of the need to maintain the database and the data in each affairs, statements and so on the needs of those in the nature of the data. For each separate statements, services, and so on the analysis must take into account a specific, limited but plete database view. When statements, services, and other analysis might be necessary to change the concept of data model. Especially in largescale 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 these circumstances, logic database design stage must be the original concept of data model and user view these independent or merged into a prehensive design. In logic design information systems also identify additional information processing needs of these new demands at this time must be integrated into the logic of earlier identified in the database database design is based on the final step for the formation of good data specifications and determine the rules, the bination, the data after consultation specifications or converted into basic atomic element. Most of today39。在這個過程中，新的數(shù)據(jù)庫需求被確定，因此被發(fā)展中的應(yīng)用使用的現(xiàn)存的數(shù)據(jù)庫 應(yīng)該進行修改。 隨著可視化編程工具（如 Visual Basic、 Java、 Visual C++和第四代語言）越來越流行，利用可視化編程工具可以很方便地修改用戶與系統(tǒng)間的界面，原型法正成為可供選擇的系統(tǒng)開發(fā)方法。最后，一旦構(gòu)建了一個可接受的原型，開發(fā)者和用戶將決定最后的原型和數(shù)據(jù)庫是否能交付使用。通常僅進行最低限度的安全性和完整性控制
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