DTO DAO POCO BO

Question

Actually i'm pretty confused about this terms and how they relate to each other. A read something about every one of them but i don't uderstant the work flow..

DTO - Data transfer object - object to transport values
BO Business object - object in domain model. object to make Business logic with
POCO - no idea, i've read a definition on wiki but didn't understood anything
DAO - data access object - object to map the DB table ?

Could someone please bring some light into it for me ?

best. title. ever. :) – Stefano Borini Jul 30 '09 at 17:07 — Stefano Borini, Jul 30 '09 at 17:07

score 39 · Accepted Answer · edited Feb 04 '14 at 15:29

39

DTO: Data Transfer Object, used to transfer data between loosly coupled services
POCO: Plain Old Clr Object, normal CLR object doesn't use any attributes or required inheritance to act as a DAO/DTO
BO: Business Object, contains business logic, used in the Business Logic part of your solution
DAO: Data Access Object, used to transfer data from your database

So a regular workflow would be to request data from a service, which is sent to your app as a DTO, you convert it to a BO to manipulate it and send it back as a DTO or after converting it to a DAO store it in a database.

You use the different object to separate concerns between the 3 types, a BO doesn't need to know whether it's persisted using a database or a service.

edited Feb 04 '14 at 15:29

Sam R.

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answered Jul 29 '09 at 22:19

Paul van Brenk

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Well said. Brief, but effective. – Kevin Swiber Jul 30 '09 at 12:09
The only thing what I miss, is what to do, if you BO logic needs to load data? How can it access the DAO? – pihentagy Feb 24 '10 at 10:32
@pihentagy that's what dal does. – nawfal Feb 16 '13 at 07:37
just as an addition: you could think of DAO as DTO between BO and database – dee zg May 06 '16 at 10:32

Paul Sweatte · Answer 2 · 2017-06-22T20:30:59.123

Timeline based scaffolding:

Batch => Stored Procedure => "plain old clr object" => npmagenda
Socket => ODBC => "data access object" => NoSQL
CSV => XML => "data transfer object" => JSON
FTP => CGI => "business object" => AJAX

References

DTO DAO POCO BO

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