Revision control
++ HEADERS = connection.h \
++ customsqlmodel.h \
++ editablesqlmodel.h
++ SOURCES = customsqlmodel.cpp \
++ editablesqlmodel.cpp \
++ main.cpp
++ QT += sql widgets
++ requires(qtConfig(tableview))
++
++ # install
++ target.path = $$[QT_INSTALL_EXAMPLES]/sql/querymodel
++ INSTALLS += target
++