c language visit Excel database, and realize a simple query operation.

database
........\2007年D题附件 邮局间直达公路里程.xls
........\data.txt
........\database.dsp
........\database.dsw
........\database.ncb
........\database.opt
........\database.plg
........\Debug
........\msado15.tlh
........\msado15.tli
........\sqlca.h
........\test.cpp
........\test.h
........\test0.cpp

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