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7.8

3-tier model (clearer seperation of tiers!)

Asked by s34n in Software/Systems Design, Design Patterns, Design & Methodology

Tags: 3-tier model software design

Hi there,

I have a question about 3-tier architectural patterns...
Currently, I have a 3-tier arc: GUI--> Business --> DAL.
All objects are created within the Business and the business and GUI can create and dispose of these objects.
When the DAL is called, data objects are passed back I.e. DataTable's etc.... The business will then use this DataTable to build up objects for these and pass them about the system as normal.

My question is, where is this line of seperation between the Business and the DAL?? ideally, the business shouldnt know about DataTable's... but should the DAL know about the business objects??


I was thinking then maybe about an intermediate object factory.
This way  the DAL would know about business objects and can pass them back to the Business layer and the then the Business wouldnt need to know about DataTables.

                ____________________
                |_Object Interface Layer_|
                    /                      \
                   /                         \
GUI --> Business      -->       DAL


any opinions on this??

Thanks

Sean
[+][-]06/17/09 06:47 AM, ID: 24648079Accepted Solution

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Zones: Software/Systems Design, Design Patterns, Design & Methodology
Tags: 3-tier model software design
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Solution Provided By: s34n
Participating Experts: 3
Solution Grade: A
 
[+][-]03/05/09 04:08 AM, ID: 23804642Expert Comment

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[+][-]03/05/09 12:16 PM, ID: 23810049Expert Comment

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[+][-]03/12/09 03:18 AM, ID: 23866433Expert Comment

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