Implement Transactions best way, in my application

Hi all,
I 'm currently developing an application, 3 - tire one, where its business services are exposed as web services, and those web services directly invokes DAO operations for data base operations.
I have a question, what is the best way to implement transsactions in my application.
Do i need to implement transactions in both Service layer as well as DAO layer ? if not is it enough to implemnt in only one layer?
What are the disadvantages im facing if i implement TX in both layers?
What are the techniques i have to follow, i mean, are there specific techniques to implement service level transactions compared to DAO transactions?
can i use spring frameowrk? with AOP support?
I'm really confused abt the way i should handle transactions, so ur reply will be a huge help for me... thanks in advance
Thanks a lot
saj
PS : if this is not the correct forum to post this questions, could you please let me know the forum i should post this instead
Edited by: sajhak on Jan 2, 2010 1:39 AM

First step, what makes you think you need transactions at all. What business rule drives it?

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