Internal model vs external model

Hey,
Internal model - the model that reflect the database model (may be hibernate).
External model - the model that expose to the word, like UI and web services.
My question:
How close (in your application) the internal model to the external model?
Dou you have an adapter layer between those two models?
Thank you

AvihaiMar wrote:
I agree with you,so lets complex the situation.
I am the central module , 3 module interact with me for saving data and getting data.
Each module has different data needs.
Do you write union " external model " , which will be based on your internal model (db model) or you write different service for each integration with different "model".That isn't complex enough.
The design of a system intended to handle inventory for walmart is going to require much more thought than for one that handles mom and pops grocery store.
The first might require various north bound interfaces whereas the second absolutely would not. It would be irresponsible to design that into the second and foolhardy not to design it for the first. The requirements of both drive the way that the intermediate layers need to be designed.

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