How to change the File name Dynamically in DataSource level

Hi friends,

I 'm Getting data from 30 Flat files...all are with same structure but different data.. .. all these files are now in Application server...

now i want to upload data into with a single DataSource and to ODS with process chains..

so, how can i dynamically change the file name in Data Source level.. i saw previous threads.. in that.. through Routines.. we can solve this problem.. but I dont know ABAP code... so, can any one plz give me the exact code.. what i have to write...exact coding..

for helpful answers ...Points will be awarded......

thanks

Babu