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Stateless DAO(EAO) versus POJO DAO

Luciano A. Pozzo
Ranch Hand

Joined: Jun 20, 2005
Posts: 112
Is it better to use DAO as stateless or DAOs as POJO? What are the advantages and disadvantages?

thanks
Jeanne Boyarsky
internet detective
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Joined: May 26, 2003
Posts: 30057
    
149

Luciano,
It depends on what is in your DAO. Personally, I find it easier to write them as POJOs because I store state for the duration of the query. If your DAO is just a facade to something else (like a JPA entity), stateless is fine.


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Luciano A. Pozzo
Ranch Hand

Joined: Jun 20, 2005
Posts: 112
Hi Jeanne,

Actually I do not store state, only delegate queries for the EntityManager. Here's an example of DAO that I am currently using:




But there came the idea of not using stateless, as example below:



The argument about this second way(just a POJO) is to improve performance.

Makes sense?
Jeanne Boyarsky
internet detective
Marshal

Joined: May 26, 2003
Posts: 30057
    
149

Originally posted by Luciano A. Pozzo:
The argument about this second way(just a POJO) is to improve performance.

Makes sense?

Kind of. It sounds like a case of premature optimization to me. If you have a problem with performance on that segment, sure. But I would think the database code would take many times longer than creating/injecting an object.
Luciano A. Pozzo
Ranch Hand

Joined: Jun 20, 2005
Posts: 112
thank you for your opinion Jeanne.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Stateless DAO(EAO) versus POJO DAO
 
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