You can check our catalog here to see if the journal is listed; if we have it, it will tell you whether it's in hard copy or on a database, or both.
You may also want to check our Journal Titles A-Z page, which not only will show you whether we have a journal in an online database, but also show the coverage of it in the different databases.
For example, if looking for the Harvard Civil Rights - Civil Liberties Law Review, you'd see this: