service « dao « Java Database Q&A

1. Java EE: Where could I read about dao, services and why they're used?    stackoverflow.com

Ok I'm new at my job, and now I'm assigned to a project which uses Spring, Hibernate and Wicket. And I see a lot of DAO and Services packages and I want to ...

2. How to create a client notification service for a webapp or should I use an Observer Pattern?    stackoverflow.com

I have a fully implemented DAO and all my beans inherit an Entity object. Now, I want to create a client notification system whereby, when a user creates/updates/delete an entity to/from a ...

3. Exposing DAO as web service    stackoverflow.com

Can anyone point me in the direction of documentation for exposing a DAO as an external web service? Currently, in my application we follow a DAO -> Service -> UI ...

4. Generic Dao and service Layer    stackoverflow.com

I am going to design a DAO layer for my application. My focus is that Services just calls DAO which is independent of underlaying implementation.

    public interface ...

5. in which layer implement validator dao response?    stackoverflow.com

I have a DAO which makes a call to a REST WS. In order to prevent non-valid data sent by the WS, i want to implement a validator. Where must i implement ...

6. DAO with JDBC, Web Service, XML File IO    coderanch.com

Hey Guys I have been on asking a few questions in the last couple of weeks, and i got a few good answers so i'm gonna try again. I need a suggestion on how to set up a proper DAO for the following situation. I may have different db connections (MySQL, SQLServer, Oracle) sounds like factory pattern, but i may also ...

7. Could explain me the relation between services and dao layer and why are needed?    coderanch.com

DAO Layer :- DAO Layer is the one where You are speacking about persistancy instead of calling JDBC or Hibernate directly. so if you want to change any setting ( Like Change the Connection settings ) ,then you can change only one place where in you DAO .Not in all the places. Service Layer :- Service Layer is the Used to ...

8. Preventing access of DAO layer from Service layer.    coderanch.com

Hi I have question regarding DAO design pattern. Generally we separate service layer from database layer by interface like DAO. e.g public interface xxxDAO { public void getData(int id); } public class xxxDAOImpl impelements xxxDAO { public void getData(int id) { // code for retriving data from db. } } Now I will acccess the DAO class from the service layer ...