which approach is better for making shopping cart application

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i want to make a shopping cart application. lator i use the paypal api for payments. i am confused which approach i have to use for making shipping cart. i studied that shopping cart making can be done in three ways.. using sessions, using cookie based apprach and using database approach.. can paypal support the three apporaches. which one is more relable. my question maybe sound stupid.. but sorry i want some info.

Posted 16-Aug-11 12:01pm

codegeekalpha

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Simon Bang Terkildsen · Accepted Answer · 2011-08-16T12:44:00

the Paypal API doesn't care how store user data in your web application, so all three options are available to you.

Cookie based:
Your data is stored between sessions, that is when a user puts something in his shopping card and closes his browser it's still in his shopping card when you visits your site again (On the same PC logged in as the same user).
But I avoid using cookies for one reason, your user might have turned off cookies.

Session based:
It's easy to use, but once the user closes his browser it's gone.

Database based:
Like cookies, your data is stored between sessions, but it seems like to much hassle to me for a shopping card.

Session+Database:
If you have a login system, then you could, once a user logs in, retrieve the shopping card data from the database into session and once the session ends persist the shopping card data from the session to the database.