How to save links in the TextField

I have a simple Blog model with a TextField. What is the best way to
save links in the TextField ?

1) Saving link in the database in this form: http://www.example.com
and then using some filter in the template to trasform it in form:

<a rel="nofollow" href="http://www.example.com>http://www.example.com</
a>

2) Saving link in the database directly in this form:

<a rel="nofollow" href="http://www.example.com>http://www.example.com</
a>

3) other solutions

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