3-Tier architecture-layering and the term-mishmash

Posted by Rookian on Stack Overflow See other posts from Stack Overflow or by Rookian
Published on 2010-04-14T11:50:15Z Indexed on 2010/04/14 11:53 UTC
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3-tier

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layering

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architecture

Hi!

I am confused about the different possibilities to express a 3-Tier architecture.

Data-Access-Layer
Business-Layer
Presentation Layer (User Interface)

or

Database (aka Backend)
Business-Layer
Presentation Layer (User Interface)

Why can you skip the database in the 1st approach? Both use a database! Does the database belong to the layering or not?!

What is wrong and what is right?

Can someone of you clarify this :)?

Thanks in advance!

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