Based on the order of the Linux interface, you can achieve the user s dishes and so on the order to delete functions

bookdinner
..........\Makefile
..........\Makefile.Debug
..........\Makefile.Release
..........\add_dishes.cpp
..........\add_dishes.h
..........\add_dishes.ui
..........\add_user.cpp
..........\add_user.h
..........\add_user.ui
..........\bill.cpp
..........\bill.h
..........\bill_management.cpp
..........\bill_management.h
..........\bill_management.ui
..........\bookdinner.pro
..........\bookdinner.pro.user
..........\caipu.qrc
..........\connection.cpp
..........\connection.h
..........\debug
..........\.....\add_dishes.o
..........\.....\add_user.o
..........\.....\bill.o
..........\.....\bill_management.o
..........\.....\bookdinner.db
..........\.....\bookdinner.exe
..........\.....\diancai.o
..........\.....\dished.o
..........\.....\dishes.o
..........\.....\dishes_management.o
..........\.....\main.o
..........\.....\mainwindow.o
..........\.....\moc_add_dishes.cpp
..........\.....\moc_add_dishes.o
..........\.....\moc_add_user.cpp
..........\.....\moc_add_user.o
..........\.....\moc_bill_management.cpp
..........\.....\moc_bill_management.o
..........\.....\moc_diancai.cpp
..........\.....\moc_diancai.o
..........\.....\moc_dishes_management.cpp
..........\.....\moc_dishes_management.o
..........\.....\moc_mainwindow.cpp
..........\.....\moc_mainwindow.o
..........\.....\moc_staff_management.cpp
..........\.....\moc_staff_management.o
..........\.....\moc_taiwei.cpp
..........\.....\moc_taiwei.o
..........\.....\moc_update_dishes.cpp
..........\.....\moc_update_dishes.o
..........\.....\moc_widget_dish.cpp
..........\.....\moc_widget_dish.o
..........\.....\moc_zhu.cpp
..........\.....\moc_zhu.o
..........\.....\qbillmanagement.o
..........\.....\qdishesmanagement.o
..........\.....\qrc_caipu.cpp
..........\.....\qrc_caipu.o
..........\.....\qstaffmanagement.o
..........\.....\qtablemanagement.o
..........\.....\staff.o
..........\.....\staff_management.o
..........\.....\tableinfo.o
..........\.....\taiwei.o
..........\.....\update_dishes.o
..........\.....\widget_dish.o
..........\.....\zhu.o
..........\diancai.cpp
..........\diancai.h
..........\diancai.ui
..........\dished.cpp
..........\dished.h
..........\dishes.cpp
..........\dishes.h
..........\dishes_management.cpp
..........\dishes_management.h
..........\dishes_management.ui
..........\images
..........\......\0001.jpg
..........\......\0002.jpg
..........\......\0003.jpg
..........\......\0004.jpg
..........\......\0005.jpg
..........\......\0006.jpg
..........\......\0007.jpg
..........\......\0008.jpg
..........\......\0009.jpg
..........\......\QQ.jpg
..........\......\original_XSRo_60960000047f118f.jpg
..........\main.cpp
..........\mainwindow.cpp
..........\mainwindow.h
..........\mainwindow.ui
..........\object_script.bookdinner.Debug
..........\object_script.bookdinner.Release
..........\qbillmanagement.cpp
..........\qbillmanagement.h
..........\qdishesmanagement.cpp
..........\qdishesmanagement.h

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