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dBASE系统下汉字和字符的动态显示方法.docx

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dBASE系统下汉字和字符的动态显示方法 Title:DynamicDisplayMethodsofChineseCharactersandCharactersinthedBASESystem Abstract: ThedBASEsystem,developedbyAshton-TateCorporationinthe1970s,wasoneoftheearliestpopulardatabasemanagementsystems(DBMS).Whileitwaspredominantlyusedforhandlingalphanumericdata,thedynamicdisplayofChinesecharactersandcharacterswasasignificantchallengefordBASEduetoitsoriginasanEnglish-basedsystem.ThispaperintendstoexplorethevariousmethodsusedtoovercomethischallengeandachievedynamicdisplayofChinesecharactersandcharactersinthedBASEsystem. Keywords:dBASEsystem,Chinesecharacters,characters,dynamicdisplay,DBMS 1.Introduction ThedynamicdisplayofChinesecharactersandcharactersinacomputersystemposesspecificchallengesduetotheircomplexstructureandthelimitationsofearlycharacterencodingsystems.ThedBASEsystem,beingprimarilydesignedforhandlingEnglish-baseddata,didnotpossessinherentsupportfordynamicdisplayofChinesecharactersandcharacters.ThispaperaimstodiscussthemethodsusedtoovercomethischallengeandachievedynamicdisplayinthedBASEsystem. 2.EncodingChineseCharactersandCharacters ThedBASEsystemprimarilyusestheASCII(AmericanStandardCodeforInformationInterchange)encodingscheme,whichislimitedto8-bitcharacters.TodisplayChinesecharactersandcharactersdynamically,itbecamenecessarytoconsideralternativeencodingschemes.TheGB2312,BIG5,andUnicodeencodingsystemswerecommonlyadoptedtoaccommodatethewiderangeofChinesecharactersandcharacters. 3.ConversionTechniques ToenablethedBASEsystemtodisplayChinesecharactersandcharacters,conversiontechniqueswereusedtomapbetweentheoriginalASCIIencodingusedbydBASEandthespecificencodingsystemforChinesecharacters.Variousconversionmethodsweredeveloped,suchas: a.CharacterIndexMapping:AssigninguniquenumericidentifierstoeachChinesecharacterorcharacterandstoringthemappinginformationinalookuptable. b.CodepointConversion:ConvertingthecharactercodepointsfromthedBASEASCIIencodingtotheirrespectivecodepointsinthechosenChinesecharacterencodingscheme. c.StringReplacement:ReplacingAS