How to retrieve content from DAO Class and process in Controller Class?

Hello
This is for the experts.
What is the best approach to passing a large set of data from Class A to Class B? I have a DAO Class that connects to a database to retrieve data. I tried saving the data in a collection (map) and passing the collection to Class B. The problem here is that the data is may be too large for a collection without increasing the heap size, it could cause out of memory exception. Instead I'd like to pass the data (row by row) on to the "Controller" Class where which will process each row. I am not sure how to do this without using a collection or some sort. Some tips will be much appreciated.
Note: MVC Rules dictates that Controller cannot call the DAO Class directly, it has to go through the Model which talks directly with the DAO Class.
Thanks
Edited by: 875864 on 30-Oct-2011 15:05

875864 wrote:
Hello
This is for the experts.
What is the best approach to passing a large set of data from Class A to Class B? I have a DAO Class that connects to a database to retrieve data. I tried saving the data in a collection (map) and passing the collection to Class B. The problem here is that the data is may be too large for a collection without increasing the heap size, it could cause out of memory exception. Instead I'd like to pass the data (row by row) on to the "Controller" Class where which will process each row. I am not sure how to do this without using a collection or some sort. Some tips will be much appreciated.
Note: MVC Rules dictates that Controller cannot call the DAO Class directly, it has to go through the Model which talks directly with the DAO Class.
Thanks
Edited by: 875864 on 30-Oct-2011 15:05if its a large set of data, and is fetched from DB and you are sure that it is too large and chances of getting out of memory exception then why you are passing it over request.
If the data is fetched based on some filter criteria, then just pass the filter criteria from class A to class B, and fetch the data from DB based on the filter criteria in class B.

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