数据库设计外文翻译.docx
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数据库设计外文翻译.docx
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数据库设计外文翻译
外文资料
Asinformationtechnologyadvances,variousmanagementsystemshaveemergedtochangethedailylivesofthemorecoherent,totheextentpossible,theuseofnetworkresourcescanbesignificantlyreasonablereductionofmanualmanagementinconvenienceandwasteoftime.
Acceleratingthemodernizationofthe21stcentury,thecontinuousimprovementofthescientificandculturallevels,therapidgrowthofthenumberofstudentswillinevitablyincreasethepressureinformationmanagementstudents,theinefficientmanualretrievalcompletelyincompatiblewiththecommunity\'sneeds.TheStudentInformationManagementSystemisaninformationmanagementonekindwithinsystem,currentlyinformationtechniquecontinuouslyofdevelopment,thenetworktechniquehasalreadybeenappliedinusextensivelynearbyofeverytrade,thereisthenetworktechnicaldevelopment,eachhighschoolsallmakeuseofacalculatortomanagetodotolearn,theschoolisoperatedbyhandicraftbeforeofthewholetediousaffairsallgotfastandsolvehigh-efficiencily,especiallystudentresultmanagementthesystemhadintheschoolverybigfunction,allcanbemoreconvenient,fastforthestudentandtheteachercomingsayingandunderstandaccuratelywithmanagementeveryonenoodlesinformation.
AbstractItisaveryheavyandbaldnessjobofmanagingabulkydatabasebymanpower.Thedisadvantage,suchasgreatcapacityofwork,lowefficiencyandlongperiod,existindatainputting,demandingandmodification.Sothecomputermanagementsystemwillbringusaquitechange.Becausetherearesomanystudentsintheschool,thedataofstudents'informationishuge,itmakesthemanagementoftheinformationbecomeacomplicatedandtediouswork.Thissystemaimsattheschool,passingbypracticallyofdemandanalysis,adoptmightyVB6.0todevelopthestudentinformationmanagementsystem.Thewholesystemdesignprocessfollowtheprincipleofsimpleoperation,beautifulandvividinterfaceandpracticalrequest.Thestudentinformationmanagementsystemincludingthefunctionofsystemmanagement,basicinformationmanagement,studymanagement,prizeandpunishmentmanagement,printstatementandsoon.Throughtheproofofusing,thestudentinformationmanagementsystemwhichthistextdesignedcansatisfytheschooltomanagethedemandoftheaspecttostudents'information.Thethesisintroducedthebackgroundofdevelopment,thefunctionsdemandedandtheprocessofdesign.Thethesismainlyexplainedthepointofthesystemdesign,thethoughtofdesign,thedifficulttechniqueandthesolutions.Thestudentmanagedthecreationofthesystemtoreducetheinconvenienceonthemanpowerconsumedly,letthewholestudentthedatamanagementismoresciencereasonable.Theplacethatthissystemhasmostthespecialfeaturesisthebackstagedatabasetounifythemanagementtostudent'sinformation.Thatsystemmainlyisdividedintothesystemmanagement,studentprofessionmanagement,studentfilemanagement,schoolfeesmanagement,coursemanagement,resultmanagementandprintthestatement.Theinterfaceofthesystemistomakeuseofthevbsoftwarecreationof,abovefewmoldspiecesareallmakeuseofthevbtocontrolathepiecebindstosettleofmethodtocarryouttheconjunctiontowardthebackstagedatabase,thebackstagedatabaseprobablyisdividedintofollowingfewformses:
Professionalinformationform,thechargescategoryform,studentthejobform,studenttheinformationform,politicalfeatureformofstudent,thecustomerlogsontheformThesystemusedClient/Serverstructuredesign,thesystemisinthedatafromoneserverandanumberofTaiwanformedLANworkstations.Userscancheckthecompetenceofdifferentsystemsindifferentuserssubmitpersonaldata,backgrounddatabaseyoucanquicklygiventhemandatetoseetothecontent.
Marksmanagementisaimportantworkofschool,theoriginalmanualmanagementhavemanyinsufficiencies,thereasonsthat,students'populationaremultitudinousinschool,andeachstudent'sinformationaretoocomplex,thustheworkloadareextremelybig,thestatisticsandtheinquiryhavebeeninconvenient.Therefore,howtosolvetheseinsufficiencies,letthemarksmanagementtobemoreconvenientandquickly,haveahigherefficiency,andbecomeakeyquestion.
Moreandmorearealsourgentalongwithschoolautomationthemarksmanagementwhenscienceandtechnologyrapiddevelopment,thereforeisessentialtodevelopthesoftwaresystemofmarksregistertoassisttheschoolteachingmanagement.Sothatcanimprovethemarksmanagement,enhancetheefficiencyofmanagement.
“Wecutnatureup,organizeitintoconcepts,andascribesignificancesaswedo,largelybecausewearepartiestoanagreementthatholdsthroughoutourspeechcommunityandiscodifiedinthepatternsofourlanguage…wecannottalkatallexceptbysubscribingtotheorganizationandclassificationofdatawhichtheagreementdecrees.”BenjaminLeeWhorf(1897-1941)
Thegenesisofthecomputerrevolutionwasinamachine.Thegenesisofourprogramminglanguagesthustendstolooklikethatmachine.
Butcomputersarenotsomuchmachinesastheyaremindamplificationtools(“bicyclesforthemind,”asSteveJobsisfondofsaying)andadifferentkindofexpressivemedium.Asaresult,thetoolsarebeginningtolooklesslikemachinesandmorelikepartsofourminds,andalsolikeotherformsofexpressionsuchaswriting,painting,sculpture,animation,andfilmmaking.Object-orientedprogramming(OOP)ispartofthismovementtowardusingthecomputerasanexpressivemedium.
ThischapterwillintroduceyoutothebasicconceptsofOOP,includinganoverviewofdevelopmentmethods.Thischapter,andthisbook,assumesthatyouhavesomeprogrammingexperience,althoughnotnecessarilyinC.Ifyouthinkyouneedmorepreparationinprogrammingbeforetacklingthisbook,youshouldworkthroughtheThinkinginCmultimediaseminar,downloadablefromwww.MindV.
Thischapterisbackgroundandsupplementarymaterial.Manypeopledonotfeelcomfortablewadingintoobject-orientedprogrammingwithoutunderstandingthebigpicturefirst.Thus,therearemanyconceptsthatareintroducedheretogiveyouasolidoverviewofOOP.However,otherpeoplemaynotgetthebigpictureconceptsuntilthey’veseensomeofthemechanicsfirst;thesepeoplemaybecomeboggeddownandlostwithoutsomecodetogettheirhandson.Ifyou’repartofthislattergroupandareeagertogettothespecificsofthelanguage,feelfreetojumppastthischapter—skippingitatthispointwillnotpreventyoufromwritingprogramsorlearningthelanguage.However,youwillwanttocomebackhereeventuallytofillinyourknowledgesoyoucanunderstandwhyobjectsareimportantandhowtodesignwiththem.
Allprogramminglanguagesprovideabstractions.Itcanbearguedthatthecomplexityoftheproblemsyou’reabletosolveisdirectlyrelatedtothekindandqualityofabstraction.By“kind”Imean,“Whatisitthatyouareabstracting?
”Assemblylanguageisasmallabstractionoftheunderlyingmachine.Manyso-called“imperative”languagesthatfollowed(suchasFORTRAN,BASIC,andC)wereabstractionsofassemblylanguage.Theselanguagesarebigimprovementsoverassemblylanguage,buttheirprimaryabstractionstillrequiresyoutothinkintermsofthestructureofthecomputerratherthanthestructureoftheproblemyouaretryingtosolve.Theprogrammermustestablishtheassociationbetweenthemachinemodel(inthe“solutionspace,”whichistheplacewhereyou’reimplementingthatsolution,suchasacomputer)andthemodeloftheproblemthatisactuallybeingsolved(inthe16ThinkinginJavaBruceEckel
Theobject-orientedapproachgoesastepfurtherbyprovidingtoolsfortheprogrammertorepresentelementsintheproblemspace.Thisrepresentationisgeneralenoughthattheprogrammerisnotconstrainedtoanyparticulartypeofproblem.Werefertotheelementsintheproblemspaceandtheirrepresentationsinthesolutionspaceas“objects.”(Youwillalsoneedotherobjectsthatdon’thaveproblem-spaceanalogs.)Theideaisthattheprogramisallowedtoadaptitselftothelingooftheproblembyaddingnewtypesofobjects,sowhenyoureadthecodedescribingthesolution,you’rereadingwordsthatalsoexpresstheproblem.Thisisamoreflexibleandpowerfullanguageabstractionthanwhatwe’vehadbefore.1Thus,OOPallowsyoutodescribetheproblemintermsoftheproblem,ratherthanintermsofthecomputerwherethesolutionwillrun.There’sstillaconnectionbacktothecomputer:
Eachobjectlooksquiteabitlikealittlecomputer—ithasastate,andithasoperationsthatyoucanaskittoperform.However,thisdoesn’tseemlikesuchabadanalogytoobjectsintherealworld—theyallhavecharacteristicsandbehaviors.
JavaismakingpossibletherapiddevelopmentofversatileprogramsforcommunicatingandcollaboratingontheInternet.We'renotjusttalkingwordprocessorsandspreadsheetshere,butalsoapplicationstohandlesales,customerservice,accounting,databases,andhumanresources--themeatandpotatoesofcorporatecomputing.Javaisalsomakingpossibleacontroversialnewclassofcheapmachinescallednetworkcomputers,orNCs,whichSUN,IBM,Oracle,Apple,andothershopewillproliferateincorporationsandourhomes.
ThewayJavaworksissimple,Unlikeordinarysoftwareapplications,whichtakeupmegabytesontheharddiskofyourPC,Javaapplications,or"applets",arelittleprogramsthatresideonthenetworkincentralizedservers,thenetworkthatdeliversthemtoyourmachineonlywhenyouneedthemtoyourmachineonlywhenyouneedthem.Becausetheappletsaresomuchsma
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