how to extract data from a txt file ?

[eluser]sasori[/eluser]
hi, can you guys tell me how to extract datas from a text file and save the data to mysql using codeigniter ?
im thinkin of using one of these

http://ellislab.com/codeigniter/user-gui...elper.html

but not sure which one should i use.
* and where am i gonna put the function that will extract the data from the txt file ?
should I put it on the controller, model or view ?