學(xué)生網(wǎng)上選課系統(tǒng)設(shè)計(jì)與實(shí)現(xiàn)畢業(yè)論文(編輯修改稿)

　

【文章內(nèi)容簡(jiǎn)介】 并能適應(yīng)市場(chǎng)競(jìng)爭(zhēng)，應(yīng)用前景廣泛。6總結(jié) 本系統(tǒng)實(shí)現(xiàn)了學(xué)生信息管理模塊、教師信息管理模塊、課程管理模塊、選課信息管理、班級(jí)管理模塊五個(gè)模塊的設(shè)計(jì)。在設(shè)計(jì)與開發(fā)過程中遇到了許多技術(shù)方面的問題。例如管理員在增加課程安排時(shí)要考慮多方面因素，同一個(gè)時(shí)間點(diǎn)不能有兩個(gè)老師給同一個(gè)班上課，一個(gè)老師也不可能在同一個(gè)時(shí)間在兩個(gè)班級(jí)上課；增加或刪除學(xué)生的選課時(shí)，已選學(xué)生要相應(yīng)的增加；刪除一個(gè)老師或者學(xué)生、課程信息時(shí)，對(duì)應(yīng)的其他表中相關(guān)的選課信息也應(yīng)該刪除。最終在自己的努力思索和查找相關(guān)文件下，出色的完成了本次項(xiàng)目。學(xué)生選課系統(tǒng)看似非常簡(jiǎn)單，其實(shí)內(nèi)部邏輯要求特別嚴(yán)謹(jǐn)，表與表之間存在密不可分的關(guān)系，如果改動(dòng)一張表的數(shù)據(jù)，則會(huì)牽扯其他的表的改動(dòng)，所以這就要求我們必須要有嚴(yán)謹(jǐn)?shù)男枨蠓治觥Ｍ瓿闪吮敬雾?xiàng)目，我學(xué)會(huì)了許多處理、解決問題的方法，大大提高了自己的動(dòng)手能力，為以后走上工作崗位打下了良好的基礎(chǔ)。第 31 頁 共31頁致 謝本次畢業(yè)設(shè)計(jì)是在李軍老師的精心指導(dǎo)下完成的，從最初的系統(tǒng)可行性的分析，包括系統(tǒng)的整體設(shè)計(jì)，系統(tǒng)功能模塊的設(shè)計(jì)，到最終系統(tǒng)的實(shí)現(xiàn)的整個(gè)階段，老師給了我很大的指導(dǎo)與幫助，在整個(gè)過程中，深深的體會(huì)到老師嚴(yán)謹(jǐn)?shù)墓ぷ髯黠L(fēng)、求真務(wù)實(shí)的科研精神、豐富扎實(shí)的專業(yè)知識(shí)很值得我們學(xué)習(xí)，在此論文完成之際，向老師表示深深的敬意及最大的感謝。參考文獻(xiàn)[1]石志國，[M].北京:清華大學(xué)出版社，2004年10月[2]姜曉銘，[M].北京:清華大學(xué)出版社，2001年6月[3][M]. 北京:清華大學(xué)出版社，2003年12月[4]耿祥義，[M].北京:清華大學(xué)出版社，2004年2月[5]薩師煊，[M].北京:高等教育出版社，2006年5月[6][M].北京:人民郵電出版社，2010年3月[7]段晨，[J].中國遠(yuǎn)程教育，2004年8月[8]趙國棟，[J].中國遠(yuǎn)程教育，2008年1月[9][J].科技信息，2010年2月[10][M].北京:新華大學(xué)出版社，2009年6月科技外文文獻(xiàn)1 ObjectiveC and CocoaAn initial distinction should be made : ObjectiveC is a language, while Cocoa is a set of classes that contribute to native MacOS X programming. Theoretically, it is possible to use ObjectiveC without Cocoa: there is a gcc frontend. But under MacOS X, both are almost inseparable, as most of the classes supplied by the language are part of Cocoa.More precisely, Cocoa is the implementation by Apple, for MacOS X, of the OpenStep standard,originally published in 1994. It consists of a developer framework based upon ObjectiveC. The GNUstep project [6] is another implementation, which is free. Its goal is to be as portable as possible on most Unix systems, and is still under development. short history of ObjectiveCIt is hard to give a precise date of birth for a language, owing to the fact that there is sometime between ?rst steps, improvements, standardisation and official announcement. However, a rough history is given in Figure 1 to get a quick look at ObjectiveC amongst its ancestors and“challengers”. Figure 1: Timeline of Java, C, C, C++ and ObjectiveCSmalltalk80 is one the ?rst “real” object languages. C++ and ObjectiveCare two different branches that build a superset of the C language. ObjectiveCis very close to Smalltalk in terms of syntax and dynamism, while C++ is much more static, with the goal of having better runtime performance. Java targets a C++ audience, but is also very inspired by Smalltalk for its object ’s why, despite this document’s title, many references are made language, developed by Microsoft, is a direct challenger to ObjectiveC.ObjectiveC++ is a kind of merge between ObjectiveC and C++. It is already usable, but some behaviours are still not perfect. The goal of ObjectiveC++ is to mix up the syntaxes of ObjectiveC and C++ to bene?t from the best features of both worlds (cf. section 14 on page 64).
ObjectiveC The present document has been updated to take in account the new features of ObjectiveC ,which has been released alongside MacOS . Those features are deep technical improvements,but the highlevel modi?cations for the developers are easily enumerable. They can now use:? a garbagecollector : cf. section on page 48。? properties : cf. section on page 58。? fast enumeration : cf. section on page 55。? new keywords @optional and @required for protocols : cf. on page 22。? updated runtime ObjectiveC library features : cf. section on page 63.Each one is detailed in a speci?c section.2 Syntax overview KeywordsObjectiveC is a superset of the C language. Like with C++, a wellwritten C program should be pileable as ObjectiveC, as long as it is not using some of the bad practices allowed by has only added some conceptsand their associated keywords. To avoid con?icts, these keywords begin with the @ (at) character. Here is the (short) exhaustive list: @class, @interface,@implementation, @public, @private, @protected, @try, @catch, @throw, @finally, @end,@protocol, @selector, @synchronized, @encode, @defs (no more documented in [4]). ObjectiveC (cf. on the preceding page) has added @optional, @required, @property, @dynamic,@synthesize. Let us alo quote the values nil et Nil, the types id, SEL and BOOL, the Boolean values being YES et NO. At last, a few kewords are available in particular contexts, and are notreserved outside: in, out, inout, bycopy, byref, oneway (they can be met whende?ning protocols: cf. section on page 24) and getter, setter, readwrite,readonly, assign, retain, copy,nonatomic (they can be met when de?ning properties : cf. section on page 58). There is an easy confusion between the language keywords and some methods inherited from the root class NSObject (the mother of every class, cf. section on page 10). For instance, the similarlooking “keywords” for memory managament, named alloc, retain, release and autorelease,are in fact methods ofNSObject. The words super and self (cf. section on page 12), could alsobe understood as keywords, but self is in fact a hidden parameter to each method, and super an instr