Posting directly into WordPress databases

I have been trying to port certain data from one of my news websites over to WordPress without me having to re-enter the items through the admin panel.

I think I’m having an authentication problem which is why I haven’t been able to get cURL to work. However, I was wondering if I can post these directly into the wordpress databases.

Is this possible, for one? Secondly, which tables are updated when there is a new post? Will it still ping the new post if I insert it directly into the wordpress database?