How can I convert everything from category X to have post format Link

Hook save_post and add the post format if the post is for that category.

(save_post) Runs whenever a post or page is
created or updated, which could be
from an import, post/page edit form,
xmlrpc, or post by email.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)