How to Iterate Through Table Records one by one

Hi all,

I want to create a logic which will Iterate through table records one by one and if a match found some action will be executed.

Please Let me know how could I do this. 

I tried (while select)  but Is fetching just the first record where as I want it to Iterate through all the table records till a match is found.

Please do the needful ,

Regards,

Nishath Salman N.