【正文】 [j]. Application of electronic technology. 2021 (2): 1618. [4] Liu De Chung Hom Kok. Principle and application of database system [m]. Wuhan: Hubei people s press. 2021. [5] Guo Haifeng. Yang Guogui. Oracle database performance tuning techniques and implementation [j]. Computer engineering. 2021. 32 (19): 8294. 濟南大學畢業(yè)設計 外文資料翻譯 9 網上選課系統(tǒng)設計的關鍵技術及系統(tǒng)的構建 摘要：學生選課是學分制管理制度改革的核心 。s Office in the normal course results to remove are not eligible for classes teaching 8 classes in, while another 4 course class class. Students can be viewed on the coursechoosing system Web site was removed, fill out the course teaching class list information, confirm the election results. After withdrawal, bined classes allow reelection of the same category of students in other courses. Normal course results when processing is plete, 143 people have a byelection. Dean39。 courseselecting system functional requirements analysis Teachers can use the system, maintain their own research and archival information, other teachers have access to part of the research, to be able to query your course schedule, can query the courses students, to entry the students, to on course score for statistical analysis, inspection under the teaching plan and teaching schedule, and so on. Manager courseselecting system functional requirements analysis Managers use the system to develop the teaching plan, have access to teaching schedule tasks, have access to all courses, students and teachers have access to basic information, to carry out all kinds of statistics, and so on. 2. Key technologies for design of work course selection system and method System design process Database design Database design is reasonable, is the key to the smooth running of the Office software system. Online course selection through to serious research, teaching and foreign colleges and universities in the province runs the entire process means of tracking the implementation of requirements analysis, design of the er model, associate system functions and data structures, and are reflected in the database design process. The system database reference 《 education management information standard under》 , bination I school actual of Senate teaching management mode for design, while meet relationship database of entity integrity, and 濟南大學畢業(yè)設計 外文資料翻譯 3 reference integrity, and user defined integrity requirements, using main key and outside key implementation data of integrity, using since defined of constraints conditions to reduced entry of plex of and errors rate, using trigger mechanism enhanced reference integrity and control database of changes, using storage process reduced database development personnel workload, improve database implementation speed. Foreground and background mon to access a database server systems, taking into account the large amounts of data the system itself (such as students 39。 Data optimized． Using JSP technology， the Web Course— Choosing system with the functions of data input，query， statistics was also given． Gave technical and methodology supports for understanding the Web Course— Choosing system structural design， making full use of current practical projects， and solving the practical problems as well as paved the way of implementation of the Web Course— Choosing system based credit support system． Key words： Web course— choosing ； system design； key techniques； construction Introduction Online course selection is an important part of teaching manag