which PHP file contains posting sql function?

[radiofranky]

Hi,
I have created additional fields in my editor and I would like to able to store those variables into database. However, I'm not quit familiar with VB yet and don't know which file contains the code for submitting the post bits to db.

I have manually create three "columns" named "price", "orig_price" and "pct".
Could someone show me where sql command is called during posting and when it pulls out to render in the template.

thanks