Simple form to save data to db

Hello,

I'm a couple days into CodeIgniter 3.0 now and very frustrated; hence the reason for signing up with this forum. I have been scouring the web for simple examples of how to save data to a db using CI 3.0, but can't find anything that is either CI 3.0, that actually works, or that is all inclusive.

Yes, the manual shows some examples of working with db's, but doesn't put it all together for you using M, V, & C files; at least not that I've seen.

So, I'm asking if someone would be generous enough to either point me in the direction of a tut that uses: CI 3.0, all M,V, & C, and proper security implementation (sql inject proof) for submitting a few form fields to a db.

If you don't have any link that would meet all those requests, would you consider providing simple MVC files that show me how to submit to a db:

1 textbox
1 listbox (i.e. menu select, drop down menu)
1 checkbox 
1 textarea
w/ Submit button

using one or two validations and anything else you like to use that you feel makes your submission more secure from an sql injection.

I learn very well when I'm able to see something and feel I can get a great start building on what you've given me if I just had a simple example to follow to get started with.

Thank you very much to anyone willing to take a little time to help.