外文翻譯---數(shù)據(jù)庫開發(fā)過程-文庫吧資料
2025-05-22 09:35本頁面
【正文】 have a working system for a long time been criticized because only work in the system until the end of the whole process generated. More and more organizations now use rapid application development method, it is a includes analysis, design and implementation of steps to repeat the rapid iterative process until convergence to users the system so far. Rapid Application Development Act required the database has been in existence, and enhance system is mainly to the application of data retrieval application, but not to those who generate and modify database applications. The most widely used method of rapid application development is one of the prototype. The prototype system is a method of iterative development process, analysts and users through close cooperation, continuing to revise the system will eventually convert all the needs of a working system. In this diagram we contains notes, briefly describes each stage of the prototype of the database development activities. Normally, when information systems problems were identified, tried only a rough concept of data modeling. In the development of the initial prototype, the design of the user wants to display and statements, and that any new database needs and define a term prototype database. This is usually a new database, copy the part of the existing system, but might also added some new content. When the need for new content, these elements are usually from external data sources, such as market research data, the general economic indicators or industry standards. When a prototype of a new version to repeat the achievement and maintenance of database activities. Usually only a minimum level of security and integrity control, because at this time the focus is as soon as possible to produce a prototype version can be used. But document management project also deferred to the final, only be used in the delivery of user training. Finally, once constructed an acceptable prototype, developers, and users will be the final decision of whether to prototype delivery and the use of the database. If the system (including database) efficiency is very low, then the system and database will be reprogramming and reorganization in order to achieve the desired performance. Along with visual programming tools (such as Visual Basic, Java, Visual C + + and fourth generation language) increasingly popular use of visual programming tools can easily change the user interface with the system, the prototype is being the choice of system development methodology. Customers using the prototype method statements and show changes to the content and layout is quite easy. In the process, the new database needs were identified, so it is the development of the use of the existing database should be amended. There is even the possibility of a need for a new database system prototype method, in such circumstances, when the system demand in the iterative process of development in the everchanging needs access to sample data, the construction or reconstruction of the database prototype. 。甚至有可能為一個需要新的數(shù)據(jù)庫的系統(tǒng)使用原型法，在這種情況下，當(dāng)系統(tǒng)需求在迭代的開發(fā)過程中不斷變化時需要獲取樣本數(shù)據(jù)以建造或重建數(shù)據(jù)庫原型。使用原型法改變用戶報表和顯示的內(nèi)容和布局是相當(dāng)容易的。如果系統(tǒng)（包括數(shù)據(jù)庫）效率很低，那么系統(tǒng)和數(shù)據(jù)庫將被重新編程和重新組織以達(dá)到期望的性能。而且文檔管理也延遲到項目的最后，在交付使用時才進(jìn)行用戶培訓(xùn)。 當(dāng)產(chǎn) 生原型新的版本時重復(fù)數(shù)據(jù)庫的實現(xiàn)和維護(hù)活動。這通常是一個新的數(shù)據(jù)庫，它復(fù)制現(xiàn)存系統(tǒng)的一部分，還可能增加了一些新的內(nèi)容。一般來說，當(dāng)信息系統(tǒng)的問題被確定時，僅僅粗略地嘗試概念數(shù)據(jù)建模。原型法是一個系統(tǒng)開發(fā)的迭代過程，通過分析員和用戶的緊密配合，持續(xù)地修改系統(tǒng)而最終將所有需求轉(zhuǎn)換成一個工作系統(tǒng)?？焖賾?yīng)用開發(fā)法在所需的數(shù)據(jù)庫已經(jīng)存在、增強(qiáng)系統(tǒng)主要是為了檢索數(shù)據(jù)的應(yīng)用中適用，而不適用于那些生成和修改數(shù)據(jù)庫的應(yīng)用。系統(tǒng)開發(fā)生命周期法經(jīng)常由于產(chǎn)生一個工作系統(tǒng)需要很長的時間而受到批評，因為工作系統(tǒng)僅僅在整個過程結(jié)束時才產(chǎn)生。 信息系統(tǒng)開發(fā)的其他方法 系統(tǒng)開發(fā)生命周期法或其稍作變化的變體經(jīng)常
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