mimi_grebici ,
DB explorer is myeclipse tools for exploring database objects (tables, views, indexes, etc).You have tutorial in Help-Help contents-MyEclipse Learning Center-Database development-Geting started
When you explore table or view you can call ‘Hibernate Reverse Engineering’ (RE eng from database explorer) if right click on table/s or view/s.MyEclipse will make mapping files form database objects (tables/views) for you.See hibernate tutorial in Help-Help contents-MyEclipse Learning Center-Spring/Hibernate development-Geting started-Hibernate development.
Please don’t hesitate to ask us, if you have some issues folowing tutorials
Best
Peco