others, not me, for our reference it, the design it's quite good

Delphi--图书信息管理系统代码
............................\图书信息管理系统
............................\................\BOOKMIS.cfg
............................\................\BOOKMIS.dof
............................\................\BOOKMIS.DPR
............................\................\BOOKMIS.exe
............................\................\BOOKMIS.res
............................\................\Database
............................\................\........\Book.DB
............................\................\........\Book.PX
............................\................\........\Class.db
............................\................\........\Class.PX
............................\................\........\Groupb.DB
............................\................\........\Groupb.PX
............................\................\........\Operator.DB
............................\................\........\Operator.PX
............................\................\........\Operator.VAL
............................\................\........\Owner.DB
............................\................\........\Owner.PX
............................\................\........\tsyhb.DB
............................\................\........\tsyhb.PX
............................\................\........\Userb.DB
............................\................\........\Userb.PX
............................\................\Main.dcu
............................\................\MAIN.ddp
............................\................\MAIN.dfm
............................\................\MAIN.PAS
............................\................\Main.txt

............................\................\uBookClassSetting.dcu
............................\................\uBookClassSetting.ddp
............................\................\uBookClassSetting.dfm
............................\................\uBookClassSetting.pas
............................\................\uBookIn.dcu
............................\................\uBookIn.ddp
............................\................\uBookIn.dfm
............................\................\uBookIn.pas
............................\................\uBookLend.dcu
............................\................\uBookLend.ddp
............................\................\uBookLend.dfm
............................\................\uBookLend.pas
............................\................\uBookModify.dcu
............................\................\uBookModify.ddp
............................\................\uBookModify.dfm
............................\................\uBookModify.pas
............................\................\uBookSearch.dcu
............................\................\uBookSearch.ddp
............................\................\uBookSearch.dfm
............................\................\uBookSearch.pas
............................\................\uLogin.dcu
............................\................\uLogin.ddp
............................\................\uLogin.dfm
............................\................\uLogin.pas
............................\................\uMgrUserF.dcu
............................\................\uMgrUserF.ddp
............................\................\uMgrUserF.dfm
............................\................\uMgrUserF.pas
............................\................\uOwnMsgF.dcu
............................\................\uOwnMsgF.dfm
............................\................\uOwnMsgF.pas
............................\................\uPublic.dcu
............................\................\uPublic.pas
............................\................\uReaderSetting.dcu
............................\................\uReaderSetting.ddp
............................\................\uReaderSetting.dfm
............................\................\uReaderSetting.pas
............................\................\uRightsSetting.dcu
............................\................\uRightsSetting.ddp
............................\..........

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