how to read rss by self ,not use the rss reader ,

Question

I am using Google AJAX Feed to handle the RSS, then I store the data in my database.

but I encountered a problem :

how to read all data which updated since last time I read it (and I will lose some items),

thanks

Answer 1

The RSS protocol doesn't support fetching only items since a certain date. Your application must poll for the current version of the feed and check the items in the feed to see if there is anything new. Use the guid child-element of the item to uniquely identify items. Ignore all items whose guid you have seen before and store those whose guid you haven't stored yet.