Description: PO can be strictly correspond to database tables, a table mapping a PO. BO is the business logic to deal with the object, and I understand that it is filled with the handling of business logic in the application of complex business logic useful. VO: value object value object, view object view object PO: Persistent Object QO: Query Object DAO: Data Access Objects- DAO mode also DTO: Data Transfer Object- DTO model also
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