Storing url link into db help

[eluser]AceCool[/eluser]
Hi, i want some advice about how store "URL's / Links" into mysql

i want to store thinks like:

www.blablal.com
blablal.com
www.blablal.com/blabvla/blabla.html

I want help/advice about type of field and how to manage the "/" it could be a possible
security rick???

Well thanks in advance
Ace