【正文】 s database, these rules from the relational database theory and the process known as standardization. This step is the result of management of these data have not cited any database management system for a plete description of the database map. Logical database design pleted, we began to identify in detail the logic of the puter program and maintenance, the report contents of the database for inquiries. 4. Physical database design and definition Physical database design and definition phase decisions puter memory (usually disk) database in the organization, definition of According to the library management system for physical structure, the procedures outlined processing services, produce the desired management information and decision support statements. The objective of this stage is to design an effective and safe management of all dataprocessing database, the physical database design to closely integrate the information systems of other physical aspects of the design, including procedures, puter hardware, operating systems and data munications networks. 5. Database Implementation The database prepared by the realization stage, testing and installation procedures for handling databases. Designers can use the standard programming language (such as COBOL, C or Visual Basic), the dedicated database processing languages (such as SQL), or the process of the nonexclusive 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 pletion of all the database files, training users for information systems (database) user setup program. The final step is to use existing sources of information (documents legacy applicat。s information system blueprint. In the information system planning, you can build an enterprise data model as a whole information system architecture part. According to Zachman (1987), Sowa and Zachman (1992) views of an information system architecture consists of the following six key ponents: Data (Figure 1 shows, but there are other methods that). Manipulation of data processing (of a data flow diagram can be used, with the object model methods, or other symbols that). Networks, which organizations and in organizations with its main transmission of data between business partners (it can connect through the network topology map and to demonstrate). People who deal with the implementation of data and information and is the source and receiver (in the process model for the data shows that the sender and the receiver). Implementation of the events and time points (they can use state transition diagram and other means.) The reasons for the incident and data processing rules (often in the form of text display, but there are also a number of charts for the planning tools such as decision tables). Information Engineering Information systems planners in accordance with the specific information system planning methods developed information system architecture. Information engineering is a popular and formal methods. Information engineering is a dataoriented creation and maintenance of the information system. Information engineering is because the dataoriented, so when you begin to understand how the database is defined by the logo and when information engineering a concise explanation is very helpful. Information Engineering follow topdown planning approach, in which specific information systems from a wide range of information needs in the understanding derived from (for example, we need about customers, products, suppliers, sales and processing of the data center), rather than merging many detailed information requested ( orders such as a screen or in accordance with the importation of geographical sales summary report). Topdown planning will enable developers to plan more prehensive information system, consider system ponents provide an integrated approach to enhance the information system and the relationship between the business objectives of the understanding, deepen their understanding of information systems throughout the organization in understanding the impact. Information Engineering includes four steps: planning, analysis, design and implementation. The planning stage of project information generated information system architecture, including enterprise data model. Information System Planning Information systems planning objective is to enable IT organizations and the business strategy closely integrated, such integration for the information systems and technology to make the most of the investment interest is very important. As the table as a description, information engineering approach the planning stage include three steps, we in the followup of three sections they discussed. 1. Critical factors determining the planning Planning is the key factor that organizational objectives, critical success factors and problem areas. These factors determine the purpose of the establishment of planning and environment planning and information systems linked to strategic business planning. Table 2 shows the Pine Valley furniture pany39。s information system planning process, it aims to help organizations create an overall data description or explanation, and not the design of a specific database. A specific database for one or more information systems provide data and the corporate data model (which may involve a number of databases) described by the organization maintaining the scope of the data. Data modeling in the enterprise, you review of the current system, the need to support analysis of the nature of the business areas, the need for further description of the abstract data, and planning one or more database development project. Figure 1 shows Pine Valley furniture pany39。老師們嚴(yán)謹(jǐn)?shù)闹螌W(xué)作風(fēng)、忘我的工作精神以及對(duì)課題的整體把握，使我在設(shè)計(jì)的過(guò)程中避免了許多方向性的錯(cuò)誤，并將遇到的難題一一解決，實(shí)現(xiàn)系統(tǒng)的功能，同時(shí)也使我學(xué)到了很多更加深入的專業(yè)知識(shí)，在此，要對(duì)他們的細(xì)心幫助和指導(dǎo)表示由衷的感謝。 該系統(tǒng)界面簡(jiǎn)潔，操作方便，常用的功能齊全，但美中不足就是現(xiàn)在這個(gè)系統(tǒng)仍然還是C/S結(jié)構(gòu)的，可能會(huì)給一些大的中介公司帶來(lái)一定的麻煩，因?yàn)檫€要