JPA and DAO

[vikram kumar]

Hi,

While using JPA, do we still need to use DAO class to connect DB or we can very well connect to database stright away from JPA class itself.

Regards,
kumar

[Cameron Wallace McKenzie]

You'll still want to go through a DAO. The DAO pattern is still valid, although there is some debate about that.

Here's a little tutorial on DAOs and Hibernate/JPA that you might find interesting:

Hibernate JPA Entities and the DAO Design Pattern

[guru prasanth]

In your application if you want to use different datasources then dao is an option.Otherwise if your application has to access data from just one database then Dao would't make much sense.

[Jari Timonen]

guru prasanth wrote:In your application if you want to use different datasources then dao is an option.Otherwise if your application has to access data from just one database then Dao would't make much sense.

Dao is good way in isolate DB/LDAP (even with JPA). Application/service layer does not need to know what's "back there".

[srivastava ashish]

Using DAO will be help even in JPA specially in case of multiple DataSources.

[vikram kumar]

Thanks All , I plan to have DAO Layer in my JPA implementation.

Regards,
Kumar

[vikram kumar]

Should we need to have JSF Backed Bean in the Class Diagram and Sequence Diagram, I thought of not to mention it, as its part of the framework. Kindly please through some light on this.

Regards,
Kumar