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Why do we have to create Service layer what has the same functions as DAO layer? Is it necessary to create all this layers?

Deepika Sahu answered on January 2, 2023 Popularity 1/10 Helpfulness 1/10

answer Why do we have to create Service layer what has the same functions as DAO layer? Is it necessary to create all this layers?

Why do we have to create Service layer what has the same functions as DAO layer? Is it necessary to create all this layers?

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Agreed, there are a lot of layers.
However this is the architecture that you will see on real world, complex Spring projects.

In our example, it is fairly simple.
We simply delegate the calls to the DAO. 
So I agree, you could remove the service layer in this simple example and have controller call dao directly.

However, we added the service layer to leverage the Service Layer design pattern.
On a much more complex project, we could use the service layer to integrate multiple data sources (daos) and perform transaction management between the two. 
So, for a simple project that we have here ... this probably overkill.
However, I wanted to show you design patterns that you will encounter on real projects.

Here are the benefits / use cases for use the service layer on a much larger project.

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Contributed on Jan 02 2023

Deepika Sahu

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Why do we have to create Service layer what has the same functions as DAO layer? Is it necessary to create all this layers?

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Why do we have to create Service layer what has the same functions as DAO layer? Is it necessary to create all this layers?

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